A few initial comments inline:
> On Mar 19, 2017, at 04:05, Steven Liu <l...@chinaffmpeg.org> wrote:
>
> ffmpeg need a dash demuxer for demux the dash formats
> base on
> https://github.com/samsamsam-iptvplayer/exteplayer3/blob/master/tmp/ffmpeg/patches/3.2.2/000001_add_dash_demux.patch
>
> Signed-off-by: Steven Liu <l...@chinaffmpeg.org>
> ---
> configure | 4 +
> libavformat/Makefile | 1 +
> libavformat/allformats.c | 2 +-
> libavformat/dashdec.c | 1845 ++++++++++++++++++++++++++++++++++++++++++++++
> 4 files changed, 1851 insertions(+), 1 deletion(-)
> create mode 100644 libavformat/dashdec.c
>
> diff --git a/configure b/configure
> index 1e2e774..4850cfa 100755
> --- a/configure
> +++ b/configure
> @@ -292,6 +292,7 @@ External library support:
> on OSX if openssl and gnutls are not used
> [autodetect]
> --enable-x11grab enable X11 grabbing (legacy) [no]
> --disable-xlib disable xlib [autodetect]
> + --disable-xml2 disable XML parsing using the C library libxml2
> [autodetect]
> --disable-zlib disable zlib [autodetect]
>
> The following libraries provide various hardware acceleration features:
> @@ -1508,6 +1509,7 @@ EXTERNAL_AUTODETECT_LIBRARY_LIST="
> sdl2
> securetransport
> xlib
> + xml2
> zlib
> "
>
> @@ -2902,6 +2904,7 @@ avi_muxer_select="riffenc"
> caf_demuxer_select="iso_media riffdec"
> caf_muxer_select="iso_media"
> dash_muxer_select="mp4_muxer"
> +dash_demuxer_select="xml2"
> dirac_demuxer_select="dirac_parser"
> dts_demuxer_select="dca_parser"
> dtshd_demuxer_select="dca_parser"
> @@ -5710,6 +5713,7 @@ enabled pthreads &&
> disabled zlib || check_lib zlib.h zlibVersion -lz || disable zlib
> disabled bzlib || check_lib2 bzlib.h BZ2_bzlibVersion -lbz2 || disable bzlib
> disabled lzma || check_lib2 lzma.h lzma_version_number -llzma || disable
> lzma
> +disabled xml2 || { add_cflags -I/usr/include/libxml2 && check_lib
> libxml/xmlversion.h xmlCheckVersion -lxml2; } || disable xml2
>
> check_lib math.h sin -lm && LIBM="-lm"
> disabled crystalhd || check_lib libcrystalhd/libcrystalhd_if.h
> DtsCrystalHDVersion -lcrystalhd || disable crystalhd
> diff --git a/libavformat/Makefile b/libavformat/Makefile
> index f56ef16..d77ffaa 100644
> --- a/libavformat/Makefile
> +++ b/libavformat/Makefile
> @@ -134,6 +134,7 @@ OBJS-$(CONFIG_CRC_MUXER) += crcenc.o
> OBJS-$(CONFIG_DATA_DEMUXER) += rawdec.o
> OBJS-$(CONFIG_DATA_MUXER) += rawenc.o
> OBJS-$(CONFIG_DASH_MUXER) += dashenc.o
> +OBJS-$(CONFIG_DASH_DEMUXER) += dashdec.o
> OBJS-$(CONFIG_DAUD_DEMUXER) += dauddec.o
> OBJS-$(CONFIG_DAUD_MUXER) += daudenc.o
> OBJS-$(CONFIG_DCSTR_DEMUXER) += dcstr.o
> diff --git a/libavformat/allformats.c b/libavformat/allformats.c
> index 09e62c3..d57314b 100644
> --- a/libavformat/allformats.c
> +++ b/libavformat/allformats.c
> @@ -96,7 +96,7 @@ static void register_all(void)
> REGISTER_DEMUXER (CINE, cine);
> REGISTER_DEMUXER (CONCAT, concat);
> REGISTER_MUXER (CRC, crc);
> - REGISTER_MUXER (DASH, dash);
> + REGISTER_MUXDEMUX(DASH, dash);
> REGISTER_MUXDEMUX(DATA, data);
> REGISTER_MUXDEMUX(DAUD, daud);
> REGISTER_DEMUXER (DCSTR, dcstr);
> diff --git a/libavformat/dashdec.c b/libavformat/dashdec.c
> new file mode 100644
> index 0000000..4c347f3
> --- /dev/null
> +++ b/libavformat/dashdec.c
> @@ -0,0 +1,1845 @@
> +/*
> + * Dynamic Adaptive Streaming over HTTP demux
> + * Copyright (c) 2017 samsam...@o2.pl based on HLS demux
> + * Copyright (c) 2017 Steven Liu
> + *
> + * This file is part of FFmpeg.
> + *
> + * FFmpeg is free software; you can redistribute it and/or
> + * modify it under the terms of the GNU Lesser General Public
> + * License as published by the Free Software Foundation; either
> + * version 2.1 of the License, or (at your option) any later version.
> + *
> + * FFmpeg is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
> + * Lesser General Public License for more details.
> + *
> + * You should have received a copy of the GNU Lesser General Public
> + * License along with FFmpeg; if not, write to the Free Software
> + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301
> USA
> + */
> +#include "libavutil/avstring.h"
> +#include "libavutil/avassert.h"
> +#include "libavutil/intreadwrite.h"
> +#include "libavutil/mathematics.h"
> +#include "libavutil/opt.h"
> +#include "libavutil/dict.h"
> +#include "libavutil/time.h"
> +#include "avformat.h"
> +#include "internal.h"
> +#include "avio_internal.h"
> +#include "url.h"
> +#include "id3v2.h"
> +
> +#define INITIAL_BUFFER_SIZE 32768
> +
> +#include <libxml/parser.h>
> +#include <libxml/tree.h>
> +
> +#if (__STDC_VERSION__ >= 199901L)
> +#include <stdint.h>
You can include this unconditionally, as used elsewhere in ffmpeg.
> +#endif
> +
> +#include <time.h>
> +#include <unistd.h>
> +
> +struct fragment {
> + int64_t url_offset;
> + int64_t size;
> + char *url;
> +};
> +
> +struct timeline {
> + int64_t t;
> + int32_t r;
> + int64_t d;
These names are confusing; at least provide comments indicating the full
meanings.
> +};
> +
> +enum RepType {
Might consider using AVMediaType?
> + REP_TYPE_UNSPECIFIED,
> + REP_TYPE_AUDIO,
> + REP_TYPE_VIDEO
> +};
> +
> +enum TemUrlType {
> + TMP_URL_TYPE_UNSPECIFIED,
> + TMP_URL_TYPE_NUMBER,
> + TMP_URL_TYPE_TIME
> +};
> +
> +/*
> + * Each playlist has its own demuxer. If it currently is active,
> + * it has an open AVIOContext too, and potentially an AVPacket
> + * containing the next packet from this stream.
> + */
> +struct representation {
> + char *url_template;
> + enum TemUrlType tmp_url_type;
> + AVIOContext pb;
> + AVIOContext *input;
> + AVFormatContext *parent;
> + AVFormatContext *ctx;
> + AVPacket pkt;
> + int rep_idx;
> + int rep_count;
> + int stream_index;
> +
> + enum RepType type;
> + int64_t target_duration;
> +
> + int n_fragments;
> + struct fragment **fragments; /* VOD list of fragment for profile */
> +
> + int n_timelines;
> + struct timeline **timelines;
> +
> + int64_t first_seq_no;
> + int64_t last_seq_no;
> +
> + int64_t fragmentDuration;
> + int64_t fragmentTimescalce;
fragmentTimescale.
> +
> + int64_t cur_seq_no;
> + int64_t cur_seg_offset;
> + int64_t cur_seg_size;
> + struct fragment *cur_seg;
> +
> + /* Currently active Media Initialization Section */
> + struct fragment *init_section;
> + uint8_t *init_sec_buf;
> + uint32_t init_sec_buf_size;
> + uint32_t init_sec_data_len;
> + uint32_t init_sec_buf_read_offset;
> + int fix_multiple_stsd_order;
> + int64_t cur_timestamp;
> +};
> +
> +typedef struct DASHContext {
> + AVClass *class;
> + char *base_url;
> + struct representation *cur_video;
> + struct representation *cur_audio;
Use time_t or int64_t.
> + uint32_t mediaPresentationDurationSec;
> + uint32_t suggestedPresentationDelaySec;
> + uint32_t presentationDelaySec;
> + uint32_t availabilityStartTimeSec;
> + uint32_t publishTimeSec;
> + uint32_t minimumUpdatePeriodSec;
> + uint32_t timeShiftBufferDepthSec;
> + uint32_t minBufferTimeSec;
> + uint32_t periodDurationSec;
> + uint32_t periodStartSec;
> + int is_live;
> + int audio_rep_index;
> + int video_rep_index;
> + AVIOInterruptCB *interrupt_callback;
> + char *user_agent; ///< holds HTTP user agent set as
> an AVOption to the HTTP protocol context
> + char *cookies; ///< holds HTTP cookie values set
> in either the initial response or as an AVOption to the HTTP protocol context
> + char *headers; ///< holds HTTP headers set as an
> AVOption to the HTTP protocol context
> + AVDictionary *avio_opts;
> +} DASHContext;
> +
> +static struct tm* ResolveUTCDateTime(const char *dateTimeString)
This is only used in GetUTCDateTimeInSec; see below.
> +{
> + time_t rawtime;
> + struct tm* timeInfo = NULL;
> + int y = 0;
> + int M = 0;
> + int d = 0;
> + int h = 0;
> + int m = 0;
> + float s = 0.0;
> +
> + /* ISO-8601 date parser */
> +
> + if (!dateTimeString || !dateTimeString[0])
> + return NULL;
> +
> + time ( &rawtime );
> + timeInfo = gmtime ( &rawtime );
> + sscanf(dateTimeString, "%d-%d-%dT%d:%d:%fZ", &y, &M, &d, &h, &m, &s);
> + timeInfo->tm_year = y - 1900;
> + timeInfo->tm_mon = M - 1;
> + timeInfo->tm_mday = d;
> + timeInfo->tm_hour = h;
> + timeInfo->tm_min = m;
> + timeInfo->tm_sec = (int)s;
> +
> + return timeInfo;
> +}
> +
> +static struct tm* GetCurrentUTCTime(void)
This is only used in GetCurrentTimeInSec; see below.
> +{
> + time_t rawTime;
> + time(&rawTime);
> + return gmtime(&rawTime);
> +}
> +
> +static uint32_t GetCurrentTimeInSec(void)
This is just a complex way to do `time(NULL)`, except it's not 2038-safe.
> +{
> + return (uint32_t)mktime(GetCurrentUTCTime());
> +}
> +
> +static uint32_t GetUTCDateTimeInSec(const char *datetime)
Use av_parse_time.
> +{
> + return (uint32_t)mktime(ResolveUTCDateTime(datetime));
> +}
> +
> +static uint32_t GetDurationInSec(const char *duration)
Use av_parse_time with duration=1.
> +{
> + /* ISO-8601 duration parser */
> + uint32_t days = 0;
> + uint32_t hours = 0;
> + uint32_t mins = 0;
> + uint32_t secs = 0;
> + uint32_t charsRead = 0;
> + float value = 0;
> + uint8_t type = 0;
> + const char *ptr = duration;
> +
> + while (*ptr) {
> + if (*ptr == 'P' || *ptr == 'T') {
> + ptr++;
> + continue;
> + }
> +
> + if (sscanf(ptr, "%f%c%n", &value, &type, &charsRead) != 2) {
> + return 0; /* parser error */
> + }
> + switch (type) {
> + case 'D':
> + days = (uint32_t)value;
> + break;
> + case 'H':
> + hours = (uint32_t)value;
> + break;
> + case 'M':
> + mins = (uint32_t)value;
> + break;
> + case 'S':
> + secs = (uint32_t)value;
> + break;
> + default:
> + // handle invalid type
> + break;
> + }
> + ptr += charsRead;
> + }
> + return ((days * 24 + hours) * 60 + mins) * 60 + secs;
> +}
> +
> +static void free_fragment(struct fragment **seg)
> +{
> + if (!seg || !(*seg)) {
> + return;
> + }
> + av_freep(&(*seg)->url);
> + av_freep(seg);
> +}
> +
> +static void free_fragment_list(struct representation *pls)
> +{
> + int i = 0;
> +
> + for (i = 0; i < pls->n_fragments; i++) {
Why not use free_fragment here?
> + av_freep(&pls->fragments[i]->url);
> + av_freep(&pls->fragments[i]);
> + }
> + av_freep(&pls->fragments);
> + pls->n_fragments = 0;
> +}
> +
> +static void free_timelines_list(struct representation *pls)
> +{
> + int i;
> +
> + for (i = 0; i < pls->n_timelines; i++) {
> + av_freep(&pls->timelines[i]);
> + }
> + av_freep(&pls->timelines);
> + pls->n_timelines = 0;
> +}
> +
> +/*
> + * Used to reset a statically allocated AVPacket to a clean slate,
> + * containing no data.
> + */
> +static void reset_packet(AVPacket *pkt)
Use av_packet_unref.
> +{
> + av_init_packet(pkt);
> + pkt->data = NULL;
> +}
> +
> +static void free_representation(struct representation *pls)
> +{
> + free_fragment_list(pls);
> + free_timelines_list(pls);
> + free_fragment(&pls->cur_seg);
> + free_fragment(&pls->init_section);
> + av_freep(&pls->init_sec_buf);
> + av_packet_unref(&pls->pkt);
> + reset_packet(&pls->pkt);
> + av_freep(&pls->pb.buffer);
> + if (pls->input)
> + ff_format_io_close(pls->parent, &pls->input);
> + if (pls->ctx) {
> + pls->ctx->pb = NULL;
> + avformat_close_input(&pls->ctx);
> + }
> +
> + av_free(pls->url_template);
> + av_free(pls);
> +}
> +
> +static void update_options(char **dest, const char *name, void *src)
> +{
> + av_freep(dest);
> + av_opt_get(src, name, AV_OPT_SEARCH_CHILDREN, (uint8_t**)dest);
> + if (*dest && !strlen(*dest))
> + av_freep(dest);
> +}
> +
> +static int open_url(AVFormatContext *s, AVIOContext **pb, const char *url,
> + AVDictionary *opts, AVDictionary *opts2, int *is_http)
> +{
> + DASHContext *c = s->priv_data;
> + AVDictionary *tmp = NULL;
> + const char *proto_name = NULL;
> + int ret;
> + void *p = NULL;
> +
> + av_dict_copy(&tmp, opts, 0);
> + av_dict_copy(&tmp, opts2, 0);
> +
> + if (!proto_name)
> + proto_name = avio_find_protocol_name(url);
> +
> + if (!proto_name)
> + return AVERROR_INVALIDDATA;
> +
> + // only http(s) & file are allowed
> + if (!av_strstart(proto_name, "http", NULL) && !av_strstart(proto_name,
> "file", NULL)) {
> + return AVERROR_INVALIDDATA;
> + }
> + if (!strncmp(proto_name, url, strlen(proto_name)) &&
> url[strlen(proto_name)] == ':') {
> + ;
> + } else if (strcmp(proto_name, "file") || !strncmp(url, "file,", 5)) {
> + return AVERROR_INVALIDDATA;
> + }
This is from hls.c, but the reformat with braces makes it a bit more confusing.
Either return to the previous format or rewrite.
> + ret = s->io_open(s, pb, url, AVIO_FLAG_READ, &tmp);
> + if (ret >= 0) {
> + // update cookies on http response with setcookies.
> + p = (s->flags & AVFMT_FLAG_CUSTOM_IO) ? NULL : s->pb;
> + update_options(&c->cookies, "cookies", p);
> + av_dict_set(&opts, "cookies", c->cookies, 0);
> + }
> +
> + av_dict_free(&tmp);
> +
> + if (is_http)
> + *is_http = av_strstart(proto_name, "http", NULL);
> +
> + return ret;
> +}
> +
> +static char *strreplace(const char *str, const char *from, const char *to)
I'd suggest moving dash_fill_tmpl_params from dashenc.c to a common dash.c, and
using that.
> +{
> + /* Adjust each of the below values to suit your needs. */
> + /* Increment positions cache size initially by this number. */
> + size_t cache_sz_inc = 16;
> + /* Thereafter, each time capacity needs to be increased,
> + * multiply the increment by this factor. */
> + const size_t cache_sz_inc_factor = 3;
> + /* But never increment capacity by more than this number. */
> + const size_t cache_sz_inc_max = 1048576;
> +
> + char *pret, *ret = NULL;
> + const char *pstr2, *pstr = str;
> + size_t i, count = 0;
> +#if (__STDC_VERSION__ >= 199901L)
> + uintptr_t *pos_cache_tmp, *pos_cache = NULL;
> +#else
> + ptrdiff_t *pos_cache_tmp, *pos_cache = NULL;
> +#endif
> + size_t cache_sz = 0;
> + size_t cpylen, orglen, retlen, tolen, fromlen = strlen(from);
> +
> + /* Find all matches and cache their positions. */
> + while ((pstr2 = strstr(pstr, from))) {
> + count++;
> + /* Increase the cache size when necessary. */
> + if (cache_sz < count) {
> + cache_sz += cache_sz_inc;
> + pos_cache_tmp = realloc(pos_cache, sizeof(*pos_cache) *
> cache_sz);
> + if (!pos_cache_tmp) {
> + goto end_strreplace;
> + } else pos_cache = pos_cache_tmp;
> + cache_sz_inc *= cache_sz_inc_factor;
> + if (cache_sz_inc > cache_sz_inc_max) {
> + cache_sz_inc = cache_sz_inc_max;
> + }
> + }
> +
> + pos_cache[count-1] = pstr2 - str;
> + pstr = pstr2 + fromlen;
> + }
> + orglen = pstr - str + strlen(pstr);
> + /* Allocate memory for the post-replacement string. */
> + if (count > 0) {
> + tolen = strlen(to);
> + retlen = orglen + (tolen - fromlen) * count;
> + } else {
> + retlen = orglen;
> + }
> + ret = av_malloc(retlen + 1);
> + if (!ret) {
> + goto end_strreplace;
> + }
> +
> + if (!count) {
> + /* If no matches, then just duplicate the string. */
> + av_strlcpy(ret, str, strlen(str));
> + } else {
> + /* Otherwise, duplicate the string whilst performing
> + * the replacements using the position cache. */
> + pret = ret;
> + memcpy(pret, str, pos_cache[0]);
> + pret += pos_cache[0];
> + for (i = 0; i < count; i++) {
> + memcpy(pret, to, tolen);
> + pret += tolen;
> + pstr = str + pos_cache[i] + fromlen;
> + cpylen = (i == count-1 ? orglen : pos_cache[i+1]) - pos_cache[i]
> - fromlen;
> + memcpy(pret, pstr, cpylen);
> + pret += cpylen;
> + }
> + ret[retlen] = '\0';
> + }
> +
> +end_strreplace:
> + /* Free the cache and return the post-replacement string,
> + * which will be NULL in the event of an error. */
> + free(pos_cache);
> + return ret;
> +}
> +
> +static char *replace_template_str(const char * url, const char *marker)
> +{
> + char *prefix = NULL;
> + char *start = 0;
> + char *end = NULL;
> + char *tmp_url = NULL;
> + char *new_url = NULL;
> + int marker_len;
> +
> + prefix = av_strdup(marker);
> + marker_len = strlen(prefix)-1;
> + prefix[marker_len] = '\0';
> +
> + start = strstr(url, prefix);
> + if (!start)
> + goto finish;
> + end = strchr(start+1, '$');
> + if (!end)
> + goto finish;
> +
> + if (start[marker_len] != '%')
> + goto finish;
> +
> + if (end[-1] != 'd')
> + goto finish;
> +
> + tmp_url = av_mallocz(MAX_URL_SIZE);
> + if (!tmp_url) {
> + return NULL;
> + }
> + strncpy(tmp_url, url, start - url);
> + strncat(tmp_url, start + marker_len, end - start - marker_len -1);
> + av_strlcat(tmp_url, PRId64, strlen(PRId64));
> + av_strlcat(tmp_url, end + 1, strlen(end + 1));
> +finish:
> + av_free(prefix);
> + new_url = strreplace(tmp_url ? tmp_url : url, marker, "%"PRId64);
> + av_free(tmp_url);
> + return new_url;
> +}
> +
> +static char * get_content_url(xmlNodePtr *baseUrlNodes, int n_baseUrlNodes,
> xmlChar *rep_id_val, xmlChar *rep_bandwidth_val, xmlChar *val)
> +{
> + int i;
> + xmlChar *text;
> + char *url = NULL;
> + char *tmp_str = av_mallocz(MAX_URL_SIZE);
> + char *tmp_str_2 = NULL;
> +
> + if (!tmp_str) {
> + return NULL;
> + }
> + for (i = 0; i < n_baseUrlNodes; ++i) {
> + if (baseUrlNodes[i] && baseUrlNodes[i]->children &&
> baseUrlNodes[i]->children->type == XML_TEXT_NODE) {
> + text = xmlNodeGetContent(baseUrlNodes[i]->children);
> + if (text) {
> + tmp_str_2 = av_mallocz(MAX_URL_SIZE);
> + if (!tmp_str_2) {
> + av_free(tmp_str);
> + return NULL;
> + }
> + ff_make_absolute_url(tmp_str_2, MAX_URL_SIZE, tmp_str, text);
> + av_free(tmp_str);
> + tmp_str = tmp_str_2;
> + xmlFree(text);
> + }
> + }
> + }
> + if (val)
> + av_strlcat(tmp_str, (const char*)val, strlen(val));
> + if (rep_id_val) {
> + url = strreplace(tmp_str, "$RepresentationID$", (const
> char*)rep_id_val);
> + av_free(tmp_str);
> + tmp_str = url;
> + }
> + if (rep_bandwidth_val && tmp_str)
> + url = strreplace(tmp_str, "$Bandwidth$", (const
> char*)rep_bandwidth_val);
> + if (tmp_str != url)
> + av_free(tmp_str);
> + return url;
> +}
> +
> +static xmlChar * get_val_from_nodes_tab(xmlNodePtr *nodes, const int
> n_nodes, const xmlChar *attrName)
> +{
> + int i;
> + xmlChar *val;
> +
> + for (i = 0; i < n_nodes; ++i) {
> + if (nodes[i]) {
> + val = xmlGetProp(nodes[i], attrName);
> + if (val)
> + return val;
> + }
> + }
> +
> + return NULL;
> +}
> +
> +static xmlNodePtr findChildNodeByName(xmlNodePtr rootnode, const xmlChar
> *nodename)
> +{
> + xmlNodePtr node = rootnode;
> + if (!node) {
> + return NULL;
> + }
> +
> + node = xmlFirstElementChild(node);
> + while (node) {
> + if (!xmlStrcmp(node->name, nodename)) {
> + return node;
> + }
> + node = xmlNextElementSibling(node);
> + }
> + return NULL;
> +}
> +
> +static enum RepType get_content_type(xmlNodePtr node)
> +{
> + enum RepType type = REP_TYPE_UNSPECIFIED;
> + int i = 0;
> + const char *attr;
> +
> + if (node) {
> + while (type == REP_TYPE_UNSPECIFIED && i < 2) {
> + attr = (i) ? "mimeType" : "contentType";
> + xmlChar *val = xmlGetProp(node, attr);
> + if (val) {
> + if (strstr((const char *)val, "video")) {
> + type = REP_TYPE_VIDEO;
> + } else if (strstr((const char *)val, "audio")) {
> + type = REP_TYPE_AUDIO;
> + }
> + xmlFree(val);
> + }
> + i++;
> + }
> + }
> + return type;
> +}
> +
> +static int parse_mainifest_segmenturlnode(AVFormatContext *s, struct
> representation *rep,
> + xmlNodePtr fragmentUrlNode,
> + xmlNodePtr *baseUrlNodes,
> + xmlChar *rep_id_val,
> + xmlChar *rep_bandwidth_val)
> +{
> + xmlChar *initialization_val = NULL;
> + xmlChar *media_val = NULL;
> +
> + if (!xmlStrcmp(fragmentUrlNode->name, (const xmlChar
> *)"Initialization")) {
> + initialization_val = xmlGetProp(fragmentUrlNode, "sourceURL");
> + if (initialization_val) {
> + rep->init_section = av_mallocz(sizeof(struct fragment));
> + if (!rep->init_section) {
> + xmlFree(initialization_val);
> + return AVERROR(ENOMEM);
> + }
> + rep->init_section->url = get_content_url(baseUrlNodes, 4,
> rep_id_val, rep_bandwidth_val, initialization_val);
> + rep->init_section->size = -1;
> + xmlFree(initialization_val);
> + }
> + } else if (!xmlStrcmp(fragmentUrlNode->name, (const xmlChar
> *)"SegmentURL")) {
> + media_val = xmlGetProp(fragmentUrlNode, "media");
> + if (media_val) {
> + struct fragment *seg = av_mallocz(sizeof(struct fragment));
> + if (!seg) {
> + xmlFree(media_val);
> + return AVERROR(ENOMEM);
> + }
> + seg->url = get_content_url(baseUrlNodes, 4, rep_id_val,
> rep_bandwidth_val, media_val);
> + seg->size = -1;
> + dynarray_add(&rep->fragments, &rep->n_fragments, seg);
> + xmlFree(media_val);
> + }
> + }
> +
> + return 0;
> +}
> +
> +static int parse_mainifest_segmenttimeline(AVFormatContext *s, struct
> representation *rep,
> + xmlNodePtr fragmentTimelineNode)
> +{
> + xmlAttrPtr attr = NULL;
> + xmlChar *val = NULL;
> +
> + if (!xmlStrcmp(fragmentTimelineNode->name, (const xmlChar *)"S")) {
> + struct timeline *tml = av_mallocz(sizeof(struct timeline));
> + if (!tml) {
> + return AVERROR(ENOMEM);
> + }
> + attr = fragmentTimelineNode->properties;
> + while (attr) {
> + val = xmlGetProp(fragmentTimelineNode, attr->name);
> + if (!xmlStrcmp(attr->name, (const xmlChar *)"t")) {
> + tml->t = (int64_t)atoll((const char *)val);
> + } else if (!xmlStrcmp(attr->name, (const xmlChar *)"r")) {
> + tml->r =(int32_t) atoi((const char *)val);
> + } else if (!xmlStrcmp(attr->name, (const xmlChar *)"d")) {
> + tml->d = (int64_t)atoll((const char *)val);
> + rep->fragmentDuration = (int64_t) atoll((const char *)val);
> + }
> + attr = attr->next;
> + xmlFree(val);
> + }
> + dynarray_add(&rep->timelines, &rep->n_timelines, tml);
> + }
> +
> + return 0;
> +}
> +
> +static int parse_mainifest_representation(AVFormatContext *s, const char
> *url,
> + xmlNodePtr node,
> + xmlNodePtr adaptionSetNode,
> + xmlNodePtr mpdBaseUrlNode,
> + xmlNodePtr periodBaseUrlNode,
> + xmlNodePtr fragmentTemplateNode,
> + xmlNodePtr contentComponentNode,
> + xmlNodePtr adaptionSetBaseUrlNode)
> +{
> + int32_t ret = 0;
> + int32_t audioRepIdx = 0;
> + int32_t videoRepIdx = 0;
> + char *temp_string = NULL;
> + DASHContext *c = s->priv_data;
> + struct representation *rep = NULL;
> + struct fragment *seg = NULL;
> + xmlNodePtr representationSegmentTemplateNode = NULL;
> + xmlNodePtr representationBaseUrlNode = NULL;
> + xmlNodePtr representationSegmentListNode = NULL;
> + xmlNodePtr fragmentTimelineNode = NULL;
> + xmlNodePtr fragmentTemplatesTab[2];
> + xmlChar *duration_val = NULL;
> + xmlChar *startNumber_val = NULL;
> + xmlChar *timescale_val = NULL;
> + xmlChar *initialization_val = NULL;
> + xmlChar *media_val = NULL;
> + xmlNodePtr baseUrlNodes[4];
> + xmlNodePtr representationNode = node;
> + xmlChar *rep_id_val = xmlGetProp(representationNode, "id");
> + xmlChar *rep_bandwidth_val = xmlGetProp(representationNode, "bandwidth");
> + enum RepType type = REP_TYPE_UNSPECIFIED;
> +
> + // try get information from representation
> + if (type == REP_TYPE_UNSPECIFIED)
> + type = get_content_type(representationNode);
> + // try get information from contentComponen
> + if (type == REP_TYPE_UNSPECIFIED)
> + type = get_content_type(contentComponentNode);
> + // try get information from adaption set
> + if (type == REP_TYPE_UNSPECIFIED)
> + type = get_content_type(adaptionSetNode);
> + if (type == REP_TYPE_UNSPECIFIED) {
> + av_log(s, AV_LOG_VERBOSE, "Parsing '%s' - skipp not supported
> representation type\n", url);
> + } else if ((type == REP_TYPE_VIDEO && ((c->video_rep_index < 0 &&
> !c->cur_video) ||
> + videoRepIdx ==
> (int32_t)c->video_rep_index )) ||
> + (type == REP_TYPE_AUDIO && ((c->audio_rep_index < 0 &&
> !c->cur_audio) ||
> + audioRepIdx ==
> (int32_t)c->audio_rep_index ))) {
> + // convert selected representation to our internal struct
> + rep = av_mallocz(sizeof(struct representation));
> + if (!rep) {
> + ret = AVERROR(ENOMEM);
> + goto faild;
> + }
> + representationSegmentTemplateNode =
> findChildNodeByName(representationNode, "SegmentTemplate");
> + representationBaseUrlNode = findChildNodeByName(representationNode,
> "BaseURL");
> + representationSegmentListNode =
> findChildNodeByName(representationNode, "SegmentList");
> + reset_packet(&rep->pkt);
> +
> + baseUrlNodes[0] = mpdBaseUrlNode;
> + baseUrlNodes[1] = periodBaseUrlNode;
> + baseUrlNodes[2] = adaptionSetBaseUrlNode;
> + baseUrlNodes[3] = representationBaseUrlNode;
> +
> + if (representationSegmentTemplateNode || fragmentTemplateNode) {
> + fragmentTimelineNode = NULL;
> + fragmentTemplatesTab[0] = representationSegmentTemplateNode;
> + fragmentTemplatesTab[1] = fragmentTemplateNode;
> +
> + duration_val = get_val_from_nodes_tab(fragmentTemplatesTab, 2,
> "duration");
> + startNumber_val = get_val_from_nodes_tab(fragmentTemplatesTab,
> 2, "startNumber");
> + timescale_val = get_val_from_nodes_tab(fragmentTemplatesTab, 2,
> "timescale");
> + initialization_val =
> get_val_from_nodes_tab(fragmentTemplatesTab, 2, "initialization");
> + media_val = get_val_from_nodes_tab(fragmentTemplatesTab, 2,
> "media");
> +
> + if (initialization_val) {
> + rep->init_section = av_mallocz(sizeof(struct fragment));
> + if (!rep->init_section) {
> + av_free(rep);
> + ret = AVERROR(ENOMEM);
> + goto faild;
> + }
> + rep->init_section->url = get_content_url(baseUrlNodes, 4,
> rep_id_val, rep_bandwidth_val, initialization_val);
> + rep->init_section->size = -1;
> + xmlFree(initialization_val);
> + }
> +
> + if (media_val) {
> + temp_string = get_content_url(baseUrlNodes, 4, rep_id_val,
> rep_bandwidth_val, media_val);
> + if (temp_string) {
> + if (strstr(temp_string, "$Number")) {
> + rep->url_template =
> replace_template_str(temp_string, "$Number$");
> + /* A URL template is provided from which clients
> build a chunk list
> + * where the chunk URLs include chunk numbers (like
> index numbers).
> + */
> + rep->tmp_url_type = TMP_URL_TYPE_NUMBER; /*
> Number-Based. */
> + } else if (strstr(temp_string, "$Time")) {
> + rep->url_template =
> replace_template_str(temp_string, "$Time$");
> + /* A URL template is provided from which clients
> build a chunk list
> + * where the chunk URLs include chunk start times.
> + */
> + rep->tmp_url_type = TMP_URL_TYPE_TIME; /*
> Time-Based. */
> + } else {
> + rep->url_template = temp_string;
> + temp_string = NULL;
> + }
> + av_free(temp_string);
> + }
> + xmlFree(media_val);
> + }
> + if (duration_val) {
> + rep->fragmentDuration = (int64_t) atoll((const char
> *)duration_val);
> + xmlFree(duration_val);
> + }
> + if (timescale_val) {
> + rep->fragmentTimescalce = (int64_t) atoll((const char
> *)timescale_val);
> + xmlFree(timescale_val);
> + }
> + if (startNumber_val) {
> + rep->first_seq_no = (int64_t) atoll((const char
> *)startNumber_val);
> + xmlFree(startNumber_val);
> + }
> +
> + fragmentTimelineNode =
> findChildNodeByName(representationSegmentTemplateNode, "SegmentTimeline");
> +
> + if (!fragmentTimelineNode)
> + fragmentTimelineNode =
> findChildNodeByName(fragmentTemplateNode, "SegmentTimeline");
> + if (fragmentTimelineNode) {
> + fragmentTimelineNode =
> xmlFirstElementChild(fragmentTimelineNode);
> + while (fragmentTimelineNode) {
> + ret = parse_mainifest_segmenttimeline(s, rep,
> fragmentTimelineNode);
> + if (ret < 0) {
> + return ret;
> + }
> + fragmentTimelineNode =
> xmlNextElementSibling(fragmentTimelineNode);
> + }
> + }
> + } else if (representationBaseUrlNode &&
> !representationSegmentListNode) {
> + seg = av_mallocz(sizeof(struct fragment));
> + if (!seg) {
> + ret = AVERROR(ENOMEM);
> + goto faild;
> + }
> + seg->url = get_content_url(baseUrlNodes, 4, rep_id_val,
> rep_bandwidth_val, NULL);
> + seg->size = -1;
> + dynarray_add(&rep->fragments, &rep->n_fragments, seg);
> + } else if (!representationBaseUrlNode &&
> representationSegmentListNode) {
> + // TODO:
> https://www.brendanlong.com/the-structure-of-an-mpeg-dash-mpd.html
> + //
> http://www-itec.uni-klu.ac.at/dash/ddash/mpdGenerator.php?fragmentlength=15&type=full
> + xmlNodePtr fragmentUrlNode = NULL;
> + duration_val = xmlGetProp(representationSegmentListNode,
> "duration");
> + timescale_val = xmlGetProp(representationSegmentListNode,
> "timescale");
> + if (duration_val) {
> + rep->fragmentDuration = (int64_t) atoll((const char
> *)duration_val);
> + xmlFree(duration_val);
> + }
> + if (timescale_val) {
> + rep->fragmentTimescalce = (int64_t) atoll((const char
> *)timescale_val);
> + xmlFree(timescale_val);
> + }
> + fragmentUrlNode =
> xmlFirstElementChild(representationSegmentListNode);
> + while (fragmentUrlNode) {
> + ret = parse_mainifest_segmenturlnode(s, rep,
> fragmentUrlNode, baseUrlNodes, rep_id_val, rep_bandwidth_val);
> + if (ret < 0) {
> + return ret;
> + }
> + fragmentUrlNode = xmlNextElementSibling(fragmentUrlNode);
> + }
> + } else {
> + free_representation(rep);
> + rep = NULL;
> + av_log(s, AV_LOG_ERROR, "Unknown format of Representation node
> id[%s] \n", (const char *)rep_id_val);
> + }
> +
> + if (rep) {
> + if (rep->fragmentDuration > 0 && !rep->fragmentTimescalce)
> + rep->fragmentTimescalce = 1;
> + if (type == REP_TYPE_VIDEO) {
> + rep->rep_idx = videoRepIdx;
> + c->cur_video = rep;
> + } else {
> + rep->rep_idx = audioRepIdx;
> + c->cur_audio = rep;
> + }
> + }
> + }
> +
> + if (type == REP_TYPE_VIDEO) {
> + videoRepIdx++;
> + }
> + if (type == REP_TYPE_AUDIO) {
> + audioRepIdx++;
> + }
> +
> +faild:
> + if (rep_id_val)
> + xmlFree(rep_id_val);
> + if (rep_bandwidth_val)
> + xmlFree(rep_bandwidth_val);
> +
> + return ret;
> +}
> +
> +static int parse_mainifest_adaptationset(AVFormatContext *s, const char
> *url, xmlNodePtr adaptionSetNode, xmlNodePtr mpdBaseUrlNode, xmlNodePtr
> periodBaseUrlNode)
> +{
> + int ret = 0;
> + xmlNodePtr fragmentTemplateNode = NULL;
> + xmlNodePtr contentComponentNode = NULL;
> + xmlNodePtr adaptionSetBaseUrlNode = NULL;
> + xmlNodePtr node = NULL;
> +
> + node = xmlFirstElementChild(adaptionSetNode);
> + while (node) {
> + if (!xmlStrcmp(node->name, (const xmlChar *)"SegmentTemplate")) {
> + fragmentTemplateNode = node;
> + } else if (!xmlStrcmp(node->name, (const xmlChar
> *)"ContentComponent")) {
> + contentComponentNode = node;
> + } else if (!xmlStrcmp(node->name, (const xmlChar *)"BaseURL")) {
> + adaptionSetBaseUrlNode = node;
> + } else if (!xmlStrcmp(node->name, (const xmlChar
> *)"Representation")) {
> + ret = parse_mainifest_representation(s, url, node,
> + adaptionSetNode,
> + mpdBaseUrlNode,
> + periodBaseUrlNode,
> + fragmentTemplateNode,
> + contentComponentNode,
> + adaptionSetBaseUrlNode);
> + if (ret < 0) {
> + return ret;
> + }
> + }
> + node = xmlNextElementSibling(node);
> + }
> + return 0;
> +}
> +
> +
> +static int parse_mainifest(AVFormatContext *s, const char *url, AVIOContext
> *in)
> +{
> + DASHContext *c = s->priv_data;
> + int ret = 0;
> + int close_in = 0;
> + uint8_t *new_url = NULL;
> + int64_t filesize = 0;
> + char *buffer = NULL;
> + AVDictionary *opts = NULL;
> + xmlDoc *doc = NULL;
> + xmlNodePtr root_element = NULL;
> + xmlNodePtr node = NULL;
> + xmlNodePtr periodNode = NULL;
> + xmlNodePtr mpdBaseUrlNode = NULL;
> + xmlNodePtr periodBaseUrlNode = NULL;
> + xmlNodePtr adaptionSetNode = NULL;
> + xmlAttrPtr attr = NULL;
> + xmlChar * val = NULL;
> + uint32_t perdiodDurationSec = 0;
> + uint32_t perdiodStartSec = 0;
> + int32_t audioRepIdx = 0;
> + int32_t videoRepIdx = 0;
> +
> + if (!in) {
> + close_in = 1;
> + /* This is XML mainfest there is no need to set range header */
> + av_dict_set(&opts, "seekable", "0", 0);
> + // broker prior HTTP options that should be consistent across
> requests
> + av_dict_set(&opts, "user-agent", c->user_agent, 0);
> + av_dict_set(&opts, "cookies", c->cookies, 0);
> + av_dict_set(&opts, "headers", c->headers, 0);
> +
> + ret = avio_open2(&in, url, AVIO_FLAG_READ, c->interrupt_callback,
> &opts);
> + av_dict_free(&opts);
> + if (ret < 0)
> + return ret;
> + }
> +
> + if (av_opt_get(in, "location", AV_OPT_SEARCH_CHILDREN, &new_url) >= 0) {
> + c->base_url = av_strdup(new_url);
> + } else {
> + c->base_url = av_strdup(url);
> + }
> +
> + filesize = avio_size(in);
> + if (filesize <= 0){
> + filesize = 8 * 1024;
> + }
Consider using xmlReadIO rather than filling a buffer like this.
> +
> + buffer = av_mallocz(filesize);
> + if (!buffer) {
> + return AVERROR(ENOMEM);
> + }
> +
> + filesize = avio_read(in, buffer, filesize);
> + if (filesize > 0) {
> + LIBXML_TEST_VERSION
> +
> + doc = xmlReadMemory(buffer, filesize, c->base_url, NULL, 0);
> + root_element = xmlDocGetRootElement(doc);
> + node = root_element;
> +
> + if (!node) {
> + ret = AVERROR_INVALIDDATA;
> + av_log(s, AV_LOG_ERROR, "Unable to parse '%s' - missing root
> node\n", url);
> + goto cleanup;
> + }
> +
> + if (node->type != XML_ELEMENT_NODE ||
> + xmlStrcmp(node->name, (const xmlChar *)"MPD")) {
> + ret = AVERROR_INVALIDDATA;
> + av_log(s, AV_LOG_ERROR, "Unable to parse '%s' - wrong root node
> name[%s] type[%d]\n", url, node->name, (int)node->type);
> + goto cleanup;
> + }
> +
> + val = xmlGetProp(node, "type");
> + if (!val) {
> + av_log(s, AV_LOG_ERROR, "Unable to parse '%s' - missing type
> attrib\n", url);
> + ret = AVERROR_INVALIDDATA;
> + goto cleanup;
> + }
> + if (!xmlStrcmp(val, (const xmlChar *)"dynamic"))
> + c->is_live = 1;
> + xmlFree(val);
> +
> + attr = node->properties;
> + while (attr) {
> + val = xmlGetProp(node, attr->name);
> +
> + if (!xmlStrcmp(attr->name, (const xmlChar
> *)"availabilityStartTime")) {
> + c->availabilityStartTimeSec = GetUTCDateTimeInSec((const
> char *)val);
> + } else if (!xmlStrcmp(attr->name, (const xmlChar
> *)"publishTime")) {
> + c->publishTimeSec = GetUTCDateTimeInSec((const char *)val);
> + } else if (!xmlStrcmp(attr->name, (const xmlChar
> *)"minimumUpdatePeriod")) {
> + c->minimumUpdatePeriodSec = GetDurationInSec((const char
> *)val);
> + } else if (!xmlStrcmp(attr->name, (const xmlChar
> *)"timeShiftBufferDepth")) {
> + c->timeShiftBufferDepthSec = GetDurationInSec((const char
> *)val);
> + } else if (!xmlStrcmp(attr->name, (const xmlChar
> *)"minBufferTime")) {
> + c->minBufferTimeSec = GetDurationInSec((const char *)val);
> + } else if (!xmlStrcmp(attr->name, (const xmlChar
> *)"suggestedPresentationDelay")) {
> + c->suggestedPresentationDelaySec = GetDurationInSec((const
> char *)val);
> + } else if (!xmlStrcmp(attr->name, (const xmlChar
> *)"mediaPresentationDuration")) {
> + c->mediaPresentationDurationSec = GetDurationInSec((const
> char *)val);
> + }
> + attr = attr->next;
> + xmlFree(val);
> + }
> +
> + mpdBaseUrlNode = findChildNodeByName(node, "BaseURL");
> +
> + // at now we can handle only one period, with the longest duration
> + node = xmlFirstElementChild(node);
> + while (node) {
> + if (!xmlStrcmp(node->name, (const xmlChar *)"Period")) {
> + perdiodDurationSec = 0;
> + perdiodStartSec = 0;
> + attr = node->properties;
> + while (attr) {
> + val = xmlGetProp(node, attr->name);
> + if (!xmlStrcmp(attr->name, (const xmlChar *)"duration"))
> {
> + perdiodDurationSec = GetDurationInSec((const char
> *)val);
> + } else if (!xmlStrcmp(attr->name, (const xmlChar
> *)"start")) {
> + perdiodStartSec = GetDurationInSec((const char
> *)val);
> + }
> + attr = attr->next;
> + xmlFree(val);
> + }
> + if ((perdiodDurationSec) >= (c->periodDurationSec)) {
> + periodNode = node;
> + c->periodDurationSec = perdiodDurationSec;
> + c->periodStartSec = perdiodStartSec;
> + if (c->periodStartSec > 0)
> + c->mediaPresentationDurationSec =
> c->periodDurationSec;
> + }
> + }
> + node = xmlNextElementSibling(node);
> + }
> + if (!periodNode) {
> + av_log(s, AV_LOG_ERROR, "Unable to parse '%s' - missing Period
> node\n", url);
> + ret = AVERROR_INVALIDDATA;
> + goto cleanup;
> + }
> + // explore AdaptationSet
> + adaptionSetNode = xmlFirstElementChild(periodNode);
> + while (adaptionSetNode) {
> + if (!xmlStrcmp(adaptionSetNode->name, (const xmlChar
> *)"BaseURL")) {
> + periodBaseUrlNode = adaptionSetNode;
> + } else if (!xmlStrcmp(adaptionSetNode->name, (const xmlChar
> *)"AdaptationSet")) {
> + parse_mainifest_adaptationset(s, url, adaptionSetNode,
> mpdBaseUrlNode, periodBaseUrlNode);
> + }
> + adaptionSetNode = xmlNextElementSibling(adaptionSetNode);
> + }
> + if (c->cur_video) {
> + c->cur_video->rep_count = videoRepIdx;
> + c->cur_video->fix_multiple_stsd_order = 1;
> + av_log(s, AV_LOG_VERBOSE, "rep_idx[%d]\n",
> (int)c->cur_video->rep_idx);
> + av_log(s, AV_LOG_VERBOSE, "rep_count[%d]\n", (int)videoRepIdx);
> + }
> + if (c->cur_audio) {
> + c->cur_audio->rep_count = audioRepIdx;
> + }
> +
> +cleanup:
> + /*free the document */
> + xmlFreeDoc(doc);
> + xmlCleanupParser();
> + } else {
> + av_log(s, AV_LOG_ERROR, "Unable to read to offset '%s'\n", url);
> + ret = AVERROR_INVALIDDATA;
> + }
> +
> + av_free(new_url);
> + av_free(buffer);
> + if (close_in) {
> + avio_close(in);
> + }
> + return ret;
> +}
> +
> +static int64_t calc_cur_seg_no(AVFormatContext *s, struct representation
> *pls)
> +{
> + DASHContext *c = pls->parent->priv_data;
> + int64_t num = 0;
> +
> + if (c->is_live) {
> + if (!pls->fragmentDuration) {
> + av_log(s, AV_LOG_ERROR, "Get not get fragment duration value in
> live mode\n");
> + return pls->first_seq_no;
> + }
> + num = pls->first_seq_no + (((GetCurrentTimeInSec() -
> c->availabilityStartTimeSec) - c->presentationDelaySec) *
> pls->fragmentTimescalce) / pls->fragmentDuration;
> + } else {
> + num = pls->first_seq_no;
> + }
> + return num;
> +}
> +
> +static int64_t calc_min_seg_no(AVFormatContext *s, struct representation
> *pls)
> +{
> + DASHContext *c = pls->parent->priv_data;
> + int64_t num = 0;
> +
> + if (c->is_live) {
> + if (!pls->fragmentDuration) {
> + av_log(s, AV_LOG_ERROR, "Get not get fragment duration value in
> live mode\n");
> + return pls->first_seq_no;
> + }
> + num = pls->first_seq_no + (((GetCurrentTimeInSec() -
> c->availabilityStartTimeSec) - c->timeShiftBufferDepthSec) *
> pls->fragmentTimescalce) / pls->fragmentDuration;
> + } else {
> + num = pls->first_seq_no;
> + }
> + return num;
> +}
> +
> +static int64_t calc_max_seg_no(AVFormatContext *s, struct representation
> *pls)
> +{
> + DASHContext *c = pls->parent->priv_data;
> + int64_t num = 0;
> + int64_t i = 0;
> +
> + if (c->is_live) {
> + if (!pls->fragmentDuration) {
> + av_log(s, AV_LOG_ERROR, "Get not get fragment duration value in
> live mode\n");
> + return pls->first_seq_no;
> + }
> + num = pls->first_seq_no + (((GetCurrentTimeInSec() -
> c->availabilityStartTimeSec)) * pls->fragmentTimescalce) /
> pls->fragmentDuration;
> + } else {
> + if (pls->n_fragments) {
> + num = pls->first_seq_no + pls->n_fragments - 1;
> + } else if (pls->n_timelines) {
> + num = pls->first_seq_no + pls->n_timelines - 1;
> + for (i = 0; i < pls->n_timelines; ++i) {
> + num += pls->timelines[i]->r;
> + }
> + } else {
> + num = pls->first_seq_no + (c->mediaPresentationDurationSec *
> pls->fragmentTimescalce) / pls->fragmentDuration;
> + }
> + }
> +
> + return num;
> +}
> +
> +static int64_t get_fragment_start_time(struct representation *pls, int64_t
> cur_seq_no)
> +{
> + int64_t i = 0;
> + int64_t j = 0;
> + int64_t num = 0;
> + int64_t startTime = 0;
> +
> + if (pls->n_timelines) {
> + for (i = 0; i < pls->n_timelines; ++i) {
> + if (pls->timelines[i]->t > 0) {
> + startTime = pls->timelines[i]->t;
> + }
> + if (num == cur_seq_no)
> + goto finish;
> + startTime += pls->timelines[i]->d;
> + for (j = 0; j < pls->timelines[i]->r; ++j) {
> + num++;
> + if (num == cur_seq_no)
> + goto finish;
> + startTime += pls->timelines[i]->d;
> + }
> + num++;
> + }
> + }
> +
> +finish:
> + return startTime;
> +}
> +
> +static struct fragment *get_current_fragment(struct representation *pls)
> +{
> + int64_t min_seq_no = 0;
> + int64_t max_seq_no = 0;
> + char *tmp_str = NULL;
> + struct fragment *seg = NULL;
> + struct fragment *seg_ptr = NULL;
> + DASHContext *c = pls->parent->priv_data;
> +
> + if (pls->n_fragments > 0) {
> + if (pls->cur_seq_no < pls->n_fragments) {
> + seg_ptr = pls->fragments[pls->cur_seq_no];
> + seg = av_mallocz(sizeof(struct fragment));
> + if (!seg) {
> + return NULL;
> + }
> + seg->url = av_strdup(seg_ptr->url);
> + if (!seg->url) {
> + av_free(seg);
> + return NULL;
> + }
> + seg->size = seg_ptr->size;
> + seg->url_offset = seg_ptr->url_offset;
> + return seg;
> + }
> + }
> + if (c->is_live) {
> + while (1) {
> + min_seq_no = calc_min_seg_no(pls->parent, pls);
> + max_seq_no = calc_max_seg_no(pls->parent, pls);
> +
> + if (pls->cur_seq_no <= min_seq_no) {
> + av_log(pls->parent, AV_LOG_VERBOSE, "old fragment:
> cur[%"PRId64"] min[%"PRId64"] max[%"PRId64"], playlist %d\n",
> + (int64_t)pls->cur_seq_no, min_seq_no, max_seq_no,
> (int)pls->rep_idx);
> + pls->cur_seq_no = calc_cur_seg_no(pls->parent, pls);
> + } else if (pls->cur_seq_no > max_seq_no) {
> + av_log(pls->parent, AV_LOG_VERBOSE, "new fragment:
> min[%"PRId64"] max[%"PRId64"], playlist %d\n",
> + min_seq_no, max_seq_no, (int)pls->rep_idx);
> + sleep(1);
> + continue;
> + }
> + break;
> + }
> + seg = av_mallocz(sizeof(struct fragment));
> + if (!seg) {
> + return NULL;
> + }
> + } else if (pls->cur_seq_no <= pls->last_seq_no) {
> + seg = av_mallocz(sizeof(struct fragment));
> + if (!seg) {
> + return NULL;
> + }
> + }
> + if (seg) {
> + if (pls->tmp_url_type != TMP_URL_TYPE_UNSPECIFIED) {
> + int64_t tmp_val = pls->tmp_url_type == TMP_URL_TYPE_NUMBER ?
> pls->cur_seq_no : get_fragment_start_time(pls, pls->cur_seq_no);
> + tmp_str = av_mallocz(MAX_URL_SIZE);
> + if (!tmp_str) {
> + return NULL;
> + }
> + snprintf(tmp_str, MAX_URL_SIZE-1, pls->url_template,
> (int64_t)tmp_val);
No. Do not use snprintf on a string containing input data.
> + seg->url = av_strdup(tmp_str);
> + if (!seg->url) {
> + av_free(tmp_str);
> + return NULL;
> + }
> + } else {
> + av_log(pls->parent, AV_LOG_ERROR, "Unable to unable to resolve
> template url '%s'\n", pls->url_template);
> + seg->url = av_strdup(pls->url_template);
> + if (!seg->url) {
> + return NULL;
> + }
> + }
> + seg->size = -1;
> + }
> +
> + av_free(tmp_str);
> + return seg;
> +}
> +
> +enum ReadFromURLMode {
> + READ_NORMAL,
> + READ_COMPLETE,
> +};
> +
> +static int read_from_url(struct representation *pls, struct fragment *seg,
> + uint8_t *buf, int buf_size,
> + enum ReadFromURLMode mode)
> +{
> + int ret;
> +
> + /* limit read if the fragment was only a part of a file */
> + if (seg->size >= 0)
> + buf_size = FFMIN(buf_size, pls->cur_seg_size - pls->cur_seg_offset);
> +
> + if (mode == READ_COMPLETE) {
> + ret = avio_read(pls->input, buf, buf_size);
> + if (ret < buf_size) {
> + av_log(pls->parent, AV_LOG_WARNING, "Could not read complete
> fragment.\n");
> + }
> + } else {
> + ret = avio_read(pls->input, buf, buf_size);
> + }
> + if (ret > 0)
> + pls->cur_seg_offset += ret;
> +
> + return ret;
> +}
> +
> +static int open_input(DASHContext *c, struct representation *pls, struct
> fragment *seg)
> +{
> + AVDictionary *opts = NULL;
> + char url[MAX_URL_SIZE];
> + int ret;
> +
> + // broker prior HTTP options that should be consistent across requests
> + av_dict_set(&opts, "user-agent", c->user_agent, 0);
> + av_dict_set(&opts, "cookies", c->cookies, 0);
> + av_dict_set(&opts, "headers", c->headers, 0);
> + if (c->is_live) {
> + av_dict_set(&opts, "seekable", "0", 0);
> + }
> +
> + if (seg->size >= 0) {
> + /* try to restrict the HTTP request to the part we want
> + * (if this is in fact a HTTP request) */
> + av_dict_set_int(&opts, "offset", seg->url_offset, 0);
> + av_dict_set_int(&opts, "end_offset", seg->url_offset + seg->size, 0);
> + }
> +
> + ff_make_absolute_url(url, MAX_URL_SIZE, c->base_url, seg->url);
> + av_log(pls->parent, AV_LOG_VERBOSE, "DASH request for url '%s', offset
> %"PRId64", playlist %d\n",
> + url, seg->url_offset, pls->rep_idx);
> + ret = open_url(pls->parent, &pls->input, url, c->avio_opts, opts, NULL);
> + if (ret < 0) {
> + goto cleanup;
> + }
> +
> + /* Seek to the requested position. If this was a HTTP request, the offset
> + * should already be where want it to, but this allows e.g. local testing
> + * without a HTTP server. */
> + if (!ret && seg->url_offset) {
> + int64_t seekret = avio_seek(pls->input, seg->url_offset, SEEK_SET);
> + if (seekret < 0) {
> + av_log(pls->parent, AV_LOG_ERROR, "Unable to seek to offset
> %"PRId64" of DASH fragment '%s'\n", seg->url_offset, seg->url);
> + ret = (int) seekret;
> + ff_format_io_close(pls->parent, &pls->input);
> + }
> + }
> +
> +cleanup:
> + av_dict_free(&opts);
> + pls->cur_seg_offset = 0;
> + pls->cur_seg_size = seg->size;
> + return ret;
> +}
> +
> +static int update_init_section(struct representation *pls)
> +{
> + static const int max_init_section_size = 1024*1024;
> + DASHContext *c = pls->parent->priv_data;
> + int64_t sec_size = 0;
> + int64_t urlsize = 0;
> + int ret = 0;
> +
> + /* read init section only once per representation */
> + if (!pls->init_section || pls->init_sec_buf) {
> + return 0;
> + }
> +
> + ret = open_input(c, pls, pls->init_section);
> + if (ret < 0) {
> + av_log(pls->parent, AV_LOG_WARNING, "Failed to open an
> initialization section in playlist %d\n", pls->rep_idx);
> + return ret;
> + }
> +
> + if (pls->init_section->size >= 0) {
> + sec_size = pls->init_section->size;
> + } else if ((urlsize = avio_size(pls->input)) >= 0) {
> + sec_size = urlsize;
> + } else {
> + sec_size = max_init_section_size;
> + }
> + av_log(pls->parent, AV_LOG_DEBUG, "Downloading an initialization section
> of size %"PRId64"\n", sec_size);
> + sec_size = FFMIN(sec_size, max_init_section_size);
> + av_fast_malloc(&pls->init_sec_buf, &pls->init_sec_buf_size, sec_size);
> + ret = read_from_url(pls, pls->init_section, pls->init_sec_buf,
> pls->init_sec_buf_size, READ_COMPLETE);
> + ff_format_io_close(pls->parent, &pls->input);
> + if (ret < 0)
> + return ret;
> +
> + if (pls->fix_multiple_stsd_order && pls->rep_idx > 0) {
> + uint8_t **stsd_entries = NULL;
> + int *stsd_entries_size = NULL;
> + int i = 4;
> +
> + while (i <= (ret - 4)) {
> + // find start stsd atom
> + if (!memcmp(pls->init_sec_buf + i, "stsd", 4)) {
> + /* 1B version
> + * 3B flags
> + * 4B num of entries */
> + int stsd_first_offset = i + 8;
> + int stsd_offset = 0;
> + int j = 0;
> + uint32_t stsd_count = AV_RB32(pls->init_sec_buf +
> stsd_first_offset);
> + stsd_first_offset += 4;
> + if (stsd_count != pls->rep_count) {
> + i++;
> + continue;
> + }
> + // find all stsd entries
> + stsd_entries = av_mallocz_array(stsd_count,
> sizeof(*stsd_entries));
> + stsd_entries_size = av_mallocz_array(stsd_count,
> sizeof(*stsd_entries_size));
> + for (j = 0; j < stsd_count; ++j) {
> + /* 4B - size
> + * 4B - format */
> + stsd_entries_size[j] = AV_RB32(pls->init_sec_buf +
> stsd_first_offset + stsd_offset);
> + stsd_entries[j] = av_malloc(stsd_entries_size[j]);
> + memcpy(stsd_entries[j], pls->init_sec_buf +
> stsd_first_offset + stsd_offset, stsd_entries_size[j]);
> + stsd_offset += stsd_entries_size[j];
> + }
> + // reorder stsd entries
> + // as first put stsd entry for current representation
> + j = pls->rep_idx;
> + stsd_offset = stsd_first_offset;
> + memcpy(pls->init_sec_buf + stsd_offset, stsd_entries[j],
> stsd_entries_size[j]);
> + stsd_offset += stsd_entries_size[j];
> + for (j = 0; j < stsd_count; ++j) {
> + if (j != pls->rep_idx) {
> + memcpy(pls->init_sec_buf + stsd_offset,
> stsd_entries[j], stsd_entries_size[j]);
> + stsd_offset += stsd_entries_size[j];
> + }
> + av_free(stsd_entries[j]);
> + }
> + av_freep(&stsd_entries);
> + av_freep(&stsd_entries_size);
> + break;
> + }
> + i++;
> + }
> + }
> +
> + av_log(pls->parent, AV_LOG_TRACE, "pls[%p] init section size[%d]\n",
> pls, (int)ret);
> + pls->init_sec_data_len = ret;
> + pls->init_sec_buf_read_offset = 0;
> +
> + return 0;
> +}
> +
> +static int64_t seek_data(void *opaque, int64_t offset, int whence)
> +{
> + struct representation *v = opaque;
> + if (v->n_fragments && !v->init_sec_data_len) {
> + return avio_seek(v->input, offset, whence);
> + }
> +
> + return AVERROR(ENOSYS);
> +}
> +
> +static int read_data(void *opaque, uint8_t *buf, int buf_size)
> +{
> + int ret = 0;
> + struct representation *v = opaque;
> + DASHContext *c = v->parent->priv_data;
> +
> +restart:
> + if (!v->input) {
> + free_fragment(&v->cur_seg);
> + v->cur_seg = get_current_fragment(v);
> + if (!v->cur_seg) {
> + ret = AVERROR_EOF;
> + goto end;
> + }
> +
> + /* load/update Media Initialization Section, if any */
> + ret = update_init_section(v);
> + if (ret)
> + goto end;
> +
> + ret = open_input(c, v, v->cur_seg);
> + if (ret < 0) {
> + if (ff_check_interrupt(c->interrupt_callback)) {
> + goto end;
> + ret = AVERROR_EXIT;
> + }
> + av_log(v->parent, AV_LOG_WARNING, "Failed to open fragment of
> playlist %d\n", v->rep_idx);
> + v->cur_seq_no++;
> + goto restart;
> + }
> + }
> +
> + if (v->init_sec_buf_read_offset < v->init_sec_data_len) {
> + /* Push init section out first before first actual fragment */
> + int copy_size = FFMIN(v->init_sec_data_len -
> v->init_sec_buf_read_offset, buf_size);
> + memcpy(buf, v->init_sec_buf, copy_size);
> + v->init_sec_buf_read_offset += copy_size;
> + ret = copy_size;
> + goto end;
> + }
> +
> + /* check the v->cur_seg, if it is null, get current and double check if
> the new v->cur_seg*/
> + if (!v->cur_seg) {
> + v->cur_seg = get_current_fragment(v);
> + }
> + if (!v->cur_seg) {
> + ret = AVERROR_EOF;
> + goto end;
> + }
> + ret = read_from_url(v, v->cur_seg, buf, buf_size, READ_NORMAL);
> + if (ret > 0)
> + goto end;
> + ff_format_io_close(v->parent, &v->input);
> + v->cur_seq_no++;
> + goto restart;
> +
> +end:
> + return ret;
> +}
> +
> +static int save_avio_options(AVFormatContext *s)
> +{
> + DASHContext *c = s->priv_data;
> + const char *opts[] = { "headers", "user_agent", "user-agent", "cookies",
> NULL }, **opt = opts;
> + uint8_t *buf = NULL;
> + int ret = 0;
> +
> + while (*opt) {
> + if (av_opt_get(s->pb, *opt, AV_OPT_SEARCH_CHILDREN, &buf) >= 0) {
> + if (buf) {
> + ret = av_dict_set(&c->avio_opts, *opt, buf,
> AV_DICT_DONT_STRDUP_VAL);
> + if (ret < 0)
> + return ret;
> + }
> + }
> + opt++;
> + }
> +
> + return ret;
> +}
> +
> +static int nested_io_open(AVFormatContext *s, AVIOContext **pb, const char
> *url,
> + int flags, AVDictionary **opts)
> +{
> + av_log(s, AV_LOG_ERROR,
> + "A HDS playlist item '%s' referred to an external file '%s'. "
> + "Opening this file was forbidden for security reasons\n",
> + s->filename, url);
> + return AVERROR(EPERM);
> +}
> +
> +static int reopen_demux_for_component(AVFormatContext *s, struct
> representation *pls)
> +{
> + DASHContext *c = s->priv_data;
> + AVInputFormat *in_fmt = NULL;
> + AVDictionary *in_fmt_opts = NULL;
> + uint8_t *avio_ctx_buffer = NULL;
> + int ret = 0;
> +
> + if (pls->ctx) {
> + /* note: the internal buffer could have changed, and be !=
> avio_ctx_buffer */
> + av_freep(&pls->pb.buffer);
> + memset(&pls->pb, 0x00, sizeof(AVIOContext));
> + pls->ctx->pb = NULL;
> + avformat_close_input(&pls->ctx);
> + pls->ctx = NULL;
> + }
> + if (!(pls->ctx = avformat_alloc_context())) {
> + ret = AVERROR(ENOMEM);
> + goto fail;
> + }
> +
> + avio_ctx_buffer = av_malloc(INITIAL_BUFFER_SIZE);
> + if (!avio_ctx_buffer ){
> + ret = AVERROR(ENOMEM);
> + avformat_free_context(pls->ctx);
> + pls->ctx = NULL;
> + goto fail;
> + }
> + if (c->is_live) {
> + ffio_init_context(&pls->pb, avio_ctx_buffer , INITIAL_BUFFER_SIZE,
> 0, pls, read_data, NULL, NULL);
> + } else {
> + ffio_init_context(&pls->pb, avio_ctx_buffer , INITIAL_BUFFER_SIZE,
> 0, pls, read_data, NULL, seek_data);
> + }
> + pls->pb.seekable = 0;
> +
> + if ((ret = ff_copy_whiteblacklists(pls->ctx, s)) < 0)
> + goto fail;
> +
> + pls->ctx->flags = AVFMT_FLAG_CUSTOM_IO;
> + pls->ctx->probesize = 1024 * 4;
> + pls->ctx->max_analyze_duration = 4 * AV_TIME_BASE;
> + ret = av_probe_input_buffer(&pls->pb, &in_fmt, "", NULL, 0, 0);
> + if (ret < 0) {
> + av_log(s, AV_LOG_ERROR, "Error when loading first fragment, playlist
> %d\n", (int)pls->rep_idx);
> + avformat_free_context(pls->ctx);
> + pls->ctx = NULL;
> + goto fail;
> + }
> +
> + pls->ctx->pb = &pls->pb;
> + pls->ctx->io_open = nested_io_open;
> +
> + // provide additional information from mpd if available
> + ret = avformat_open_input(&pls->ctx, "", in_fmt, &in_fmt_opts);
> //pls->init_section->url
> + av_dict_free(&in_fmt_opts);
> + if (ret < 0)
> + goto fail;
> + if (pls->n_fragments) {
> + ret = avformat_find_stream_info(pls->ctx, NULL);
> + if (ret < 0)
> + goto fail;
> + }
> +
> +fail:
> + return ret;
> +}
> +
> +static int open_demux_for_component(AVFormatContext *s, struct
> representation *pls)
> +{
> + int ret = 0;
> + int i;
> +
> + pls->parent = s;
> + pls->cur_seq_no = calc_cur_seg_no(s, pls);
> + pls->last_seq_no = calc_max_seg_no(s, pls);
> +
> + ret = reopen_demux_for_component(s, pls);
> + if (ret < 0) {
> + goto fail;
> + }
> + for (i = 0; i < pls->ctx->nb_streams; i++) {
> + AVStream *st = avformat_new_stream(s, NULL);
> + AVStream *ist = pls->ctx->streams[i];
> + if (!st) {
> + ret = AVERROR(ENOMEM);
> + goto fail;
> + }
> + st->id = i;
> + avcodec_parameters_copy(st->codecpar,
> pls->ctx->streams[i]->codecpar);
> + avpriv_set_pts_info(st, ist->pts_wrap_bits, ist->time_base.num,
> ist->time_base.den);
> + }
> +
> + return 0;
> +fail:
> + return ret;
> +}
> +
> +static int dash_read_header(AVFormatContext *s)
> +{
> + void *u = (s->flags & AVFMT_FLAG_CUSTOM_IO) ? NULL : s->pb;
> + DASHContext *c = s->priv_data;
> + int ret = 0;
> + int stream_index = 0;
> +
> + c->interrupt_callback = &s->interrupt_callback;
> + // if the URL context is good, read important options we must broker
> later
> + if (u) {
> + update_options(&c->user_agent, "user-agent", u);
> + update_options(&c->cookies, "cookies", u);
> + update_options(&c->headers, "headers", u);
> + }
> +
> + if ((ret = parse_mainifest(s, s->filename, s->pb)) < 0)
> + goto fail;
> +
> + if ((ret = save_avio_options(s)) < 0)
> + goto fail;
> +
> + /* If this isn't a live stream, fill the total duration of the
> + * stream. */
> + if (!c->is_live) {
> + s->duration = (int64_t) c->mediaPresentationDurationSec *
> AV_TIME_BASE;
> + }
> +
> + /* Open the demuxer for curent video and current audio components if
> available */
> + if (!ret && c->cur_video) {
> + ret = open_demux_for_component(s, c->cur_video);
> + if (!ret) {
> + c->cur_video->stream_index = stream_index;
> + ++stream_index;
> + } else {
> + free_representation(c->cur_video);
> + c->cur_video = NULL;
> + }
> + }
> +
> + if (!ret && c->cur_audio) {
> + ret = open_demux_for_component(s, c->cur_audio);
> + if (!ret) {
> + c->cur_audio->stream_index = stream_index;
> + ++stream_index;
> + } else {
> + free_representation(c->cur_audio);
> + c->cur_audio = NULL;
> + }
> + }
> +
> + if (!stream_index) {
> + ret = AVERROR_INVALIDDATA;
> + goto fail;
> + }
> +
> + /* Create a program */
> + if (!ret) {
> + AVProgram *program;
> + program = av_new_program(s, 0);
> + if (!program) {
> + goto fail;
> + }
> +
> + if (c->cur_video) {
> + av_program_add_stream_index(s, 0, c->cur_video->stream_index);
> + }
> +
> + if (c->cur_audio) {
> + av_program_add_stream_index(s, 0, c->cur_audio->stream_index);
> + }
> + }
> +
> + return 0;
> +fail:
> + return ret;
> +}
> +
> +static int dash_read_packet(AVFormatContext *s, AVPacket *pkt)
> +{
> + DASHContext *c = s->priv_data;
> + int ret = 0;
> + struct representation *cur = NULL;
> +
> + if (!c->cur_audio && !c->cur_video) {
> + return AVERROR_INVALIDDATA;
> + }
> + if (c->cur_audio && !c->cur_video) {
> + cur = c->cur_audio;
> + } else if (!c->cur_audio && c->cur_video) {
> + cur = c->cur_video;
> + } else if (c->cur_video->cur_timestamp < c->cur_audio->cur_timestamp) {
> + cur = c->cur_video;
> + } else {
> + cur = c->cur_audio;
> + }
> +
> + if (cur->ctx) {
> + ret = av_read_frame(cur->ctx, &cur->pkt);
> + if (ret < 0) {
> + reset_packet(&cur->pkt);
> + } else {
> + /* If we got a packet, return it */
> + *pkt = cur->pkt;
> + cur->cur_timestamp = av_rescale(pkt->pts,
> (int64_t)cur->ctx->streams[0]->time_base.num * 90000,
> cur->ctx->streams[0]->time_base.den);
> + pkt->stream_index = cur->stream_index;
> + reset_packet(&cur->pkt);
> + return 0;
> + }
> + }
> + return AVERROR_EOF;
> +}
> +
> +static int dash_close(AVFormatContext *s)
> +{
> + DASHContext *c = s->priv_data;
> +
> + if (c->cur_audio) {
> + free_representation(c->cur_audio);
> + }
> +
> + if (c->cur_video) {
> + free_representation(c->cur_video);
> + }
> +
> + av_freep(&c->cookies);
> + av_freep(&c->user_agent);
> + av_dict_free(&c->avio_opts);
> + av_freep(&c->base_url);
> + return 0;
> +}
> +
> +static int dash_seek(AVFormatContext *s, struct representation *pls, int64_t
> seekPosMSec, int flags)
> +{
> + int ret = 0;
> + int i = 0;
> + int j = 0;
> + int64_t duration = 0;
> +
> + av_log(pls->parent, AV_LOG_VERBOSE, "DASH seek pos[%"PRId64"ms],
> playlist %d\n", seekPosMSec, pls->rep_idx);
> +
> + // single fragment mode
> + if (pls->n_fragments) {
> + pls->cur_timestamp = 0;
> + pls->cur_seg_offset = 0;
> + ff_read_frame_flush(pls->ctx);
> + return av_seek_frame(pls->ctx, -1, seekPosMSec*1000, flags);
> + }
> +
> + if (pls->input)
> + ff_format_io_close(pls->parent, &pls->input);
> +
> + // find the nearest fragment
> + if (pls->n_timelines > 0 && pls->fragmentTimescalce > 0) {
> + int64_t num = pls->first_seq_no;
> + av_log(pls->parent, AV_LOG_VERBOSE, "dash_seek with SegmentTimeline
> start n_timelines[%d] last_seq_no[%"PRId64"], playlist %d.\n",
> + (int)pls->n_timelines, (int64_t)pls->last_seq_no,
> (int)pls->rep_idx);
> + for (i = 0; i < pls->n_timelines; i++) {
> + if (pls->timelines[i]->t > 0) {
> + duration = pls->timelines[i]->t;
> + }
> + duration += pls->timelines[i]->d;
> + if (seekPosMSec < ((duration * 1000) /
> pls->fragmentTimescalce)) {
> + goto set_seq_num;
> + }
> + for (j = 0; j < pls->timelines[i]->r; j++) {
> + duration += pls->timelines[i]->d;
> + num++;
> + if (seekPosMSec < ((duration * 1000) /
> pls->fragmentTimescalce)) {
> + goto set_seq_num;
> + }
> + }
> + num++;
> + }
> +
> +set_seq_num:
> + pls->cur_seq_no = num > pls->last_seq_no ? pls->last_seq_no : num;
> + av_log(pls->parent, AV_LOG_VERBOSE, "dash_seek with SegmentTimeline
> end cur_seq_no[%"PRId64"], playlist %d.\n",
> + (int64_t)pls->cur_seq_no, (int)pls->rep_idx);
> + } else if (pls->fragmentDuration > 0) {
> + pls->cur_seq_no = pls->first_seq_no + ((seekPosMSec *
> pls->fragmentTimescalce) / pls->fragmentDuration) / 1000;
> + } else {
> + av_log(pls->parent, AV_LOG_ERROR, "dash_seek missing
> fragmentDuration\n");
> + pls->cur_seq_no = pls->first_seq_no;
> + }
> + pls->cur_timestamp = 0;
> + pls->cur_seg_offset = 0;
> + pls->init_sec_buf_read_offset = 0;
> + ret = reopen_demux_for_component(s, pls);
> +
> + return ret;
> +}
> +
> +static int dash_read_seek(AVFormatContext *s, int stream_index, int64_t
> timestamp, int flags)
> +{
> + int ret = 0;
> + DASHContext *c = s->priv_data;
> + int64_t seekPosMSec = av_rescale_rnd(timestamp, 1000,
> +
> s->streams[stream_index]->time_base.den,
> + flags & AVSEEK_FLAG_BACKWARD ?
> + AV_ROUND_DOWN : AV_ROUND_UP);
> + if ((flags & AVSEEK_FLAG_BYTE) || c->is_live)
> + return AVERROR(ENOSYS);
> + if (c->cur_audio) {
> + ret = dash_seek(s, c->cur_audio, seekPosMSec, flags);
> + }
> + if (!ret && c->cur_video) {
> + ret = dash_seek(s, c->cur_video, seekPosMSec, flags);
> + }
> + return ret;
> +}
> +
> +static int dash_probe(AVProbeData *p)
> +{
> + if (!strstr(p->buf, "<MPD"))
> + return 0;
> +
> + if (strstr(p->buf, "dash:profile:isoff-on-demand:2011") ||
> + strstr(p->buf, "dash:profile:isoff-live:2011") ||
> + strstr(p->buf, "dash:profile:isoff-live:2012") ||
> + strstr(p->buf, "dash:profile:isoff-main:2011")) {
> + return AVPROBE_SCORE_MAX;
> + }
> + if (strstr(p->buf, "dash:profile")) {
> + return AVPROBE_SCORE_MAX >> 1;
> + }
> +
> + return 0;
> +}
> +
> +#define OFFSET(x) offsetof(DASHContext, x)
> +#define FLAGS AV_OPT_FLAG_DECODING_PARAM
> +static const AVOption dash_options[] = {
> + {"audio_rep_index", "audio representation index to be used",
> OFFSET(audio_rep_index), AV_OPT_TYPE_INT, {.i64 = -1}, INT_MIN, INT_MAX,
> FLAGS},
> + {"video_rep_index", "video representation index to be used",
> OFFSET(video_rep_index), AV_OPT_TYPE_INT, {.i64 = -1}, INT_MIN, INT_MAX,
> FLAGS},
> + {NULL}
> +};
> +
> +static const AVClass dash_class = {
> + .class_name = "dash",
> + .item_name = av_default_item_name,
> + .option = dash_options,
> + .version = LIBAVUTIL_VERSION_INT,
> +};
> +
> +AVInputFormat ff_dash_demuxer = {
> + .name = "dash",
> + .long_name = NULL_IF_CONFIG_SMALL("Dynamic Adaptive Streaming over
> HTTP"),
> + .priv_class = &dash_class,
> + .priv_data_size = sizeof(DASHContext),
> + .read_probe = dash_probe,
> + .read_header = dash_read_header,
> + .read_packet = dash_read_packet,
> + .read_close = dash_close,
> + .read_seek = dash_read_seek,
> + .flags = AVFMT_NO_BYTE_SEEK,
> +};
> --
> 2.10.1 (Apple Git-78)
>
>
>
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> ffmpeg-devel@ffmpeg.org
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