On Wed, Oct 27, 2021 at 12:54 AM Paul B Mahol <one...@gmail.com> wrote:
>
>
>
> On Fri, Oct 8, 2021 at 1:42 AM <p...@sandflow.com> wrote:
>>
>> From: Pierre-Anthony Lemieux <p...@sandflow.com>
>>
>> Signed-off-by: Pierre-Anthony Lemieux <p...@sandflow.com>
>> ---
>>
>> Notes:
>> Implements the IMF demuxer.
>>
>> libavformat/imfdec.c | 660 +++++++++++++++++++++++++++++++++++++++++++
>> 1 file changed, 660 insertions(+)
>> create mode 100644 libavformat/imfdec.c
>>
>> diff --git a/libavformat/imfdec.c b/libavformat/imfdec.c
>> new file mode 100644
>> index 0000000000..0c64fe0c03
>> --- /dev/null
>> +++ b/libavformat/imfdec.c
>> @@ -0,0 +1,660 @@
>> +/*
>> + * Copyright (c) Sandflow Consulting LLC
>> + *
>> + * Redistribution and use in source and binary forms, with or without
>> + * modification, are permitted provided that the following conditions are
>> met:
>> + *
>> + * * Redistributions of source code must retain the above copyright notice,
>> this
>> + * list of conditions and the following disclaimer.
>> + * * Redistributions in binary form must reproduce the above copyright
>> notice,
>> + * this list of conditions and the following disclaimer in the
>> documentation
>> + * and/or other materials provided with the distribution.
>> + *
>> + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
>> IS"
>> + * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
>> + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
>> PURPOSE
>> + * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
>> + * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
>> + * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
>> + * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
>> + * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
>> + * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
>> + * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
>> THE
>> + * POSSIBILITY OF SUCH DAMAGE.
>> + *
>> + * 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
>> + */
>> +
>> +/**
>> + * Demuxes an IMF Composition
>> + *
>> + * References
>> + * OV 2067-0:2018 - SMPTE Overview Document - Interoperable Master Format
>> + * ST 2067-2:2020 - SMPTE Standard - Interoperable Master Format — Core
>> Constraints
>> + * ST 2067-3:2020 - SMPTE Standard - Interoperable Master Format —
>> Composition Playlist
>> + * ST 2067-5:2020 - SMPTE Standard - Interoperable Master Format — Essence
>> Component
>> + * ST 2067-20:2016 - SMPTE Standard - Interoperable Master Format —
>> Application #2
>> + * ST 2067-21:2020 - SMPTE Standard - Interoperable Master Format —
>> Application #2 Extended
>> + * ST 2067-102:2017 - SMPTE Standard - Interoperable Master Format — Common
>> Image Pixel Color Schemes
>> + * ST 429-9:2007 - SMPTE Standard - D-Cinema Packaging — Asset Mapping and
>> File Segmentation
>> + *
>> + * @author Marc-Antoine Arnaud
>> + * @author Valentin Noel
>> + * @file
>> + * @ingroup lavu_imf
>> + */
>> +
>> +#include "imf.h"
>> +#include "imf_internal.h"
>> +#include "internal.h"
>> +#include "libavutil/opt.h"
>> +#include "libavutil/bprint.h"
>> +#include "libavutil/avstring.h"
>> +#include "mxf.h"
>> +#include "url.h"
>> +#include <libxml/parser.h>
>> +#include <inttypes.h>
>> +
>> +#define MAX_BPRINT_READ_SIZE (UINT_MAX - 1)
>> +#define DEFAULT_ASSETMAP_SIZE 8 * 1024
>> +
>> +typedef struct IMFVirtualTrackResourcePlaybackCtx {
>> + IMFAssetLocator *locator;
>> + IMFTrackFileResource *resource;
>> + AVFormatContext *ctx;
>> +} IMFVirtualTrackResourcePlaybackCtx;
>> +
>> +typedef struct IMFVirtualTrackPlaybackCtx {
>> + // Track index in playlist
>> + int32_t index;
>> + // Time counters
>> + AVRational current_timestamp;
>> + AVRational duration;
>> + // Resources
>> + unsigned int resource_count;
>> + IMFVirtualTrackResourcePlaybackCtx **resources;
>> + // Decoding cursors
>> + uint32_t current_resource_index;
>> + int64_t last_pts;
>> +} IMFVirtualTrackPlaybackCtx;
>> +
>> +typedef struct IMFContext {
>> + const AVClass *class;
>> + const char *base_url;
>> + char *asset_map_paths;
>> + AVIOInterruptCB *interrupt_callback;
>> + AVDictionary *avio_opts;
>> + IMFCPL *cpl;
>> + IMFAssetLocatorMap *asset_locator_map;
>> + unsigned int track_count;
>> + IMFVirtualTrackPlaybackCtx **tracks;
>> +} IMFContext;
>> +
>> +int is_url(const char *string) {
>> + char *substr = strstr(string, "://");
>> + return substr != NULL;
>> +}
>> +
>> +int is_unix_absolute_path(const char *string) {
>> + char *substr = strstr(string, "/");
>> + int index = (int)(substr - string);
>> + return index == 0;
>> +}
>> +
>> +int is_dos_absolute_path(const char *string) {
>
>
> Are those function static or not? Also bad code style above and bellow that
> does not match ffmpeg code style at all.
The functions are not static and are defined in imf_internal.h. They
are used in both libavformat/imfdec.c and the tests at
libavformat/tests/imf.c. Ok?
By bad code style, do you mean using brackets for a single if-statement?
>
>
>> + // Absolute path case: `C:\path\to\somwhere`
>> + char *substr = strstr(string, ":\\");
>> + int index = (int)(substr - string);
>> + if (index == 1) {
>> + return 1;
>> + }
>> +
>> + // Absolute path case: `C:/path/to/somwhere`
>> + substr = strstr(string, ":/");
>> + index = (int)(substr - string);
>> + if (index == 1) {
>> + return 1;
>> + }
>> +
>> + // Network path case: `\\path\to\somwhere`
>> + substr = strstr(string, "\\\\");
>> + index = (int)(substr - string);
>> + return index == 0;
>> +}
>> +
>> +int parse_imf_asset_map_from_xml_dom(AVFormatContext *s, xmlDocPtr doc,
>> IMFAssetLocatorMap **asset_map, const char *base_url) {
>> + xmlNodePtr asset_map_element = NULL;
>> + xmlNodePtr node = NULL;
>> + char *uri;
>> + int ret = 0;
>> +
>> + IMFAssetLocator *asset = NULL;
>> +
>> + asset_map_element = xmlDocGetRootElement(doc);
>> +
>> + if (!asset_map_element) {
>> + av_log(s, AV_LOG_ERROR, "Unable to parse asset map XML - missing
>> root node\n");
>> + return AVERROR_INVALIDDATA;
>> + }
>> +
>> + if (asset_map_element->type != XML_ELEMENT_NODE ||
>> av_strcasecmp(asset_map_element->name, "AssetMap")) {
>> + av_log(s, AV_LOG_ERROR, "Unable to parse asset map XML - wrong root
>> node name[%s] type[%d]\n", asset_map_element->name,
>> (int)asset_map_element->type);
>> + return AVERROR_INVALIDDATA;
>> + }
>> +
>> + // parse asset locators
>> +
>> + if (!(node = xml_get_child_element_by_name(asset_map_element,
>> "AssetList"))) {
>> + av_log(s, AV_LOG_ERROR, "Unable to parse asset map XML - missing
>> AssetList node\n");
>> + return AVERROR_INVALIDDATA;
>> + }
>> +
>> + node = xmlFirstElementChild(node);
>> + while (node) {
>> + if (av_strcasecmp(node->name, "Asset") != 0) {
>> + continue;
>> + }
>> +
>> + asset = av_malloc(sizeof(IMFAssetLocator));
>> +
>> + if (xml_read_UUID(xml_get_child_element_by_name(node, "Id"),
>> asset->uuid)) {
>> + av_log(s, AV_LOG_ERROR, "Could not parse UUID from asset in
>> asset map.\n");
>> + av_freep(&asset);
>> + return 1;
>> + }
>> +
>> + av_log(s, AV_LOG_DEBUG, "Found asset id: " UUID_FORMAT "\n",
>> UID_ARG(asset->uuid));
>> +
>> + if (!(node = xml_get_child_element_by_name(node, "ChunkList"))) {
>>
>> + av_log(s, AV_LOG_ERROR, "Unable to parse asset map XML -
>> missing ChunkList node\n");
>> + return AVERROR_INVALIDDATA;
>> + }
>> +
>> + if (!(node = xml_get_child_element_by_name(node, "Chunk"))) {
>> + av_log(s, AV_LOG_ERROR, "Unable to parse asset map XML -
>> missing Chunk node\n");
>> + return AVERROR_INVALIDDATA;
>> + }
>> +
>> + uri = xmlNodeGetContent(xml_get_child_element_by_name(node,
>> "Path"));
>> +
>> + if (!is_url(uri) && !is_unix_absolute_path(uri) &&
>> !is_dos_absolute_path(uri)) {
>> + uri = av_append_path_component(base_url, uri);
>> + }
>> +
>> + asset->absolute_uri = strdup(uri);
>
>
> av_strdup()
> also does not check for failure.
>
>>
>> + av_free(uri);
>> +
>> + av_log(s, AV_LOG_DEBUG, "Found asset absolute URI: %s\n",
>> asset->absolute_uri);
>> +
>> + node = xmlNextElementSibling(node->parent->parent);
>> +
>> + (*asset_map)->assets = av_realloc((*asset_map)->assets,
>> ((*asset_map)->asset_count + 1) * sizeof(IMFAssetLocator));
>
>
> Leaks on allocation error. Invalid write on allocation error. Not only for
> this line but all lines that use this function.
>
>>
>> + (*asset_map)->assets[(*asset_map)->asset_count++] = asset;
>> + }
>> +
>> + return ret;
>> +}
>> +
>> +IMFAssetLocatorMap *imf_asset_locator_map_alloc(void) {
>> + IMFAssetLocatorMap *asset_map;
>> +
>> + asset_map = av_malloc(sizeof(IMFAssetLocatorMap));
>> + if (!asset_map)
>> + return NULL;
>> +
>> + asset_map->assets = NULL;
>> + asset_map->asset_count = 0;
>> + return asset_map;
>> +}
>> +
>> +void imf_asset_locator_map_free(IMFAssetLocatorMap *asset_map) {
>> + if (asset_map == NULL) {
>> + return;
>> + }
>> +
>>
>> + for (int i = 0; i < asset_map->asset_count; ++i) {
>> + av_free(asset_map->assets[i]);
>
>
> Invalid free and invalid read access if allocation was unsuccessful.
>
> Please check for error cases all over patches, not just this single case.
>
>> + }
>> +
>> + av_freep(&asset_map->assets);
>> + av_freep(&asset_map);
>> +}
>> +
>> +static int parse_assetmap(AVFormatContext *s, const char *url, AVIOContext
>> *in) {
>> + IMFContext *c = s->priv_data;
>> + struct AVBPrint buf;
>> + AVDictionary *opts = NULL;
>> + xmlDoc *doc = NULL;
>> + const char *base_url;
>> +
>> + int close_in = 0;
>> + int ret;
>> + int64_t filesize;
>> +
>> + base_url = av_dirname(strdup(url));
>> + if (c->asset_locator_map == NULL) {
>> + c->asset_locator_map = imf_asset_locator_map_alloc();
>> + if (!c->asset_locator_map) {
>> + av_log(s, AV_LOG_ERROR, "Unable to allocate asset map
>> locator\n");
>> + return AVERROR_BUG;
>> + }
>> + }
>> +
>> + av_log(s, AV_LOG_DEBUG, "Asset Map URL: %s\n", url);
>> +
>> + if (!in) {
>> + close_in = 1;
>> +
>> + av_dict_copy(&opts, c->avio_opts, 0);
>> + ret = avio_open2(&in, url, AVIO_FLAG_READ, c->interrupt_callback,
>> &opts);
>> + av_dict_free(&opts);
>> + if (ret < 0)
>> + return ret;
>> + }
>> +
>> + filesize = avio_size(in);
>> + filesize = filesize > 0 ? filesize : DEFAULT_ASSETMAP_SIZE;
>> +
>> + av_bprint_init(&buf, filesize + 1, AV_BPRINT_SIZE_UNLIMITED);
>> +
>> + if ((ret = avio_read_to_bprint(in, &buf, MAX_BPRINT_READ_SIZE)) < 0 ||
>> !avio_feof(in) || (filesize = buf.len) == 0) {
>> + av_log(s, AV_LOG_ERROR, "Unable to read to asset map '%s'\n", url);
>> + if (ret == 0)
>> + ret = AVERROR_INVALIDDATA;
>> + } else {
>> + LIBXML_TEST_VERSION
>> +
>> + doc = xmlReadMemory(buf.str, filesize, url, NULL, 0);
>> +
>> + ret = parse_imf_asset_map_from_xml_dom(s, doc,
>> &c->asset_locator_map, base_url);
>> + if (ret != 0) {
>> + goto cleanup;
>> + }
>> +
>> + av_log(s, AV_LOG_DEBUG, "Found %d assets from %s\n",
>> c->asset_locator_map->asset_count, url);
>> +
>> + cleanup:
>> + xmlFreeDoc(doc);
>> + }
>> + if (close_in) {
>> + avio_close(in);
>> + }
>> + return ret;
>> +}
>> +
>> +static IMFAssetLocator *find_asset_map_locator(IMFAssetLocatorMap
>> *asset_map, UUID uuid) {
>> + IMFAssetLocator *asset_locator;
>> + for (int i = 0; i < asset_map->asset_count; ++i) {
>> + asset_locator = asset_map->assets[i];
>> + if (memcmp(asset_map->assets[i]->uuid, uuid, 16) == 0) {
>> + return asset_locator;
>> + }
>> + }
>> + return NULL;
>> +}
>> +
>> +static int open_track_resource_context(AVFormatContext *s,
>> IMFVirtualTrackResourcePlaybackCtx *track_resource) {
>> + int ret = 0;
>> + int64_t entry_point;
>> +
>> + if (!track_resource->ctx) {
>> + track_resource->ctx = avformat_alloc_context();
>> + }
>> +
>> + if (track_resource->ctx->iformat) {
>> + av_log(s, AV_LOG_DEBUG, "Input context already opened for %s.\n",
>> track_resource->locator->absolute_uri);
>> + return ret;
>> + }
>> +
>> + ret = avformat_open_input(&track_resource->ctx,
>> track_resource->locator->absolute_uri, NULL, NULL);
>> + if (ret < 0) {
>> + av_log(s, AV_LOG_ERROR, "Could not open %s input context: %s\n",
>> track_resource->locator->absolute_uri, av_err2str(ret));
>> + goto cleanup;
>> + }
>> +
>> + ret = avformat_find_stream_info(track_resource->ctx, NULL);
>> + if (ret < 0) {
>> + av_log(s, AV_LOG_ERROR, "Could not find %s stream information:
>> %s\n", track_resource->locator->absolute_uri, av_err2str(ret));
>> + goto cleanup;
>> + }
>> +
>> + // Compare the source timebase to the resource edit rate, considering
>> the first stream of the source file
>> + if (av_cmp_q(track_resource->ctx->streams[0]->time_base,
>> av_inv_q(track_resource->resource->base.edit_rate))) {
>> + av_log(s, AV_LOG_WARNING, "Incoherent source stream timebase %d/%d
>> regarding resource edit rate: %d/%d",
>> track_resource->ctx->streams[0]->time_base.num,
>> track_resource->ctx->streams[0]->time_base.den,
>> track_resource->resource->base.edit_rate.den,
>> track_resource->resource->base.edit_rate.num);
>> + }
>> +
>> + entry_point = (int64_t)track_resource->resource->base.entry_point *
>> track_resource->resource->base.edit_rate.den * AV_TIME_BASE /
>> track_resource->resource->base.edit_rate.num;
>> +
>> + if (entry_point) {
>> + av_log(s, AV_LOG_DEBUG, "Seek at resource %s entry point: %ld\n",
>> track_resource->locator->absolute_uri,
>> track_resource->resource->base.entry_point);
>> + ret = avformat_seek_file(track_resource->ctx, -1, entry_point,
>> entry_point, entry_point, 0);
>> + if (ret < 0) {
>> + av_log(s, AV_LOG_ERROR, "Could not seek at %" PRId64 "on %s:
>> %s\n", entry_point, track_resource->locator->absolute_uri, av_err2str(ret));
>> + goto cleanup;
>> + }
>> + }
>> +
>> + return ret;
>> +cleanup:
>> + avformat_free_context(track_resource->ctx);
>> + return ret;
>> +}
>> +
>> +static int open_track_file_resource(AVFormatContext *s,
>> IMFTrackFileResource *track_file_resource, IMFVirtualTrackPlaybackCtx
>> *track) {
>> + IMFContext *c = s->priv_data;
>> + IMFVirtualTrackResourcePlaybackCtx *track_resource;
>> + IMFAssetLocator *asset_locator;
>> +
>> + int ret;
>> +
>> + if (!(asset_locator = find_asset_map_locator(c->asset_locator_map,
>> track_file_resource->track_file_uuid))) {
>> + av_log(s, AV_LOG_ERROR, "Could not find asset locator for UUID: "
>> UUID_FORMAT "\n", UID_ARG(track_file_resource->track_file_uuid));
>> + return AVERROR_INVALIDDATA;
>> + }
>> +
>> + av_log(s, AV_LOG_DEBUG, "Found locator for " UUID_FORMAT ": %s\n",
>> UID_ARG(asset_locator->uuid), asset_locator->absolute_uri);
>> +
>> + track_resource = av_mallocz(sizeof(IMFVirtualTrackResourcePlaybackCtx));
>> + track_resource->locator = asset_locator;
>> + track_resource->resource = track_file_resource;
>> +
>> + if ((ret = open_track_resource_context(s, track_resource)) != 0) {
>> + return ret;
>> + }
>> +
>> + for (int repetition = 0; repetition <
>> track_file_resource->base.repeat_count; ++repetition) {
>> + track->resources = av_realloc(track->resources,
>> (track->resource_count + 1) * sizeof(IMFVirtualTrackResourcePlaybackCtx));
>> + track->resources[track->resource_count++] = track_resource;
>> + track->duration = av_add_q(track->duration,
>> av_make_q((int)track_resource->resource->base.duration *
>> track_resource->resource->base.edit_rate.den,
>> track_resource->resource->base.edit_rate.num));
>> + }
>> +
>> + return ret;
>> +}
>> +
>> +static int open_virtual_track(AVFormatContext *s, IMFTrackFileVirtualTrack
>> *virtual_track, int32_t track_index) {
>> + IMFContext *c = s->priv_data;
>> + IMFVirtualTrackPlaybackCtx *track;
>> + int ret = 0;
>> +
>> + track = av_mallocz(sizeof(IMFVirtualTrackPlaybackCtx));
>> + track->index = track_index;
>> + track->duration = av_make_q(0, INT32_MAX);
>> +
>> + for (int i = 0; i < virtual_track->resource_count; i++) {
>> + av_log(s, AV_LOG_DEBUG, "Open stream from file " UUID_FORMAT ",
>> stream %d\n", UID_ARG(virtual_track->resources[i].track_file_uuid), i);
>> + if ((ret = open_track_file_resource(s,
>> &virtual_track->resources[i], track)) != 0) {
>> + av_log(s, AV_LOG_ERROR, "Could not open image track resource "
>> UUID_FORMAT "\n", UID_ARG(virtual_track->resources[i].track_file_uuid));
>> + return ret;
>> + }
>> + }
>> +
>> + track->current_timestamp = av_make_q(0, track->duration.den);
>> +
>> + c->tracks = av_realloc(c->tracks, (c->track_count + 1) *
>> sizeof(IMFVirtualTrackPlaybackCtx));
>> + c->tracks[c->track_count++] = track;
>> +
>> + return ret;
>> +}
>> +
>> +static void
>> imf_virtual_track_playback_context_free(IMFVirtualTrackPlaybackCtx *track) {
>> + if (!track) {
>> + return;
>> + }
>> +
>> + for (int i = 0; i < track->resource_count; ++i) {
>> + if (!track->resources[i]) {
>> + continue;
>> + }
>> +
>> + if (track->resources[i]->ctx && track->resources[i]->ctx->iformat) {
>> + avformat_free_context(track->resources[i]->ctx);
>> + track->resources[i]->ctx = NULL;
>> + }
>> + }
>> +}
>> +
>> +static int set_context_streams_from_tracks(AVFormatContext *s) {
>> + IMFContext *c = s->priv_data;
>> +
>> + AVStream *asset_stream;
>> + AVStream *first_resource_stream;
>> +
>> + int ret = 0;
>> +
>> + for (int i = 0; i < c->track_count; ++i) {
>> + // Open the first resource of the track to get stream information
>> + first_resource_stream = c->tracks[i]->resources[0]->ctx->streams[0];
>> +
>> + av_log(s, AV_LOG_DEBUG, "Open the first resource of track %d\n",
>> c->tracks[i]->index);
>> +
>> + // Copy stream information
>> + asset_stream = avformat_new_stream(s, NULL);
>> + asset_stream->id = i;
>> + if ((ret = avcodec_parameters_copy(asset_stream->codecpar,
>> first_resource_stream->codecpar)) < 0) {
>> + av_log(s, AV_LOG_ERROR, "Could not copy stream parameters\n");
>> + break;
>> + }
>> + avpriv_set_pts_info(asset_stream,
>> first_resource_stream->pts_wrap_bits, first_resource_stream->time_base.num,
>> first_resource_stream->time_base.den);
>> + asset_stream->duration =
>> (int64_t)av_q2d(av_mul_q(c->tracks[i]->duration,
>> av_inv_q(asset_stream->time_base)));
>> + }
>> +
>> + return ret;
>> +}
>> +
>> +static int open_cpl_tracks(AVFormatContext *s) {
>> + IMFContext *c = s->priv_data;
>> + int32_t track_index = 0;
>> + int ret;
>> +
>> + if (c->cpl->main_image_2d_track) {
>> + if ((ret = open_virtual_track(s, c->cpl->main_image_2d_track,
>> track_index++)) != 0) {
>> + av_log(s, AV_LOG_ERROR, "Could not open image track "
>> UUID_FORMAT "\n", UID_ARG(c->cpl->main_image_2d_track->base.id_uuid));
>> + return ret;
>> + }
>> + }
>> +
>> + for (int audio_track_index = 0; audio_track_index <
>> c->cpl->main_audio_track_count; ++audio_track_index) {
>> + if ((ret = open_virtual_track(s,
>> &c->cpl->main_audio_tracks[audio_track_index], track_index++)) != 0) {
>> + av_log(s, AV_LOG_ERROR, "Could not open audio track "
>> UUID_FORMAT "\n",
>> UID_ARG(c->cpl->main_audio_tracks[audio_track_index].base.id_uuid));
>> + return ret;
>> + }
>> + }
>> +
>> + return set_context_streams_from_tracks(s);
>> +}
>> +
>> +static int imf_close(AVFormatContext *s);
>> +
>> +static int imf_read_header(AVFormatContext *s) {
>> + IMFContext *c = s->priv_data;
>> + char *asset_map_path;
>> + int ret;
>> +
>> + c->base_url = av_dirname(av_strdup(s->url));
>> +
>> + av_log(s, AV_LOG_DEBUG, "start parsing IMF CPL: %s\n", s->url);
>> +
>> + if ((ret = parse_imf_cpl(s->pb, &c->cpl)) < 0)
>> + goto fail;
>> +
>> + av_log(s, AV_LOG_DEBUG, "parsed IMF CPL: " UUID_FORMAT "\n",
>> UID_ARG(c->cpl->id_uuid));
>> +
>> + if (!c->asset_map_paths) {
>> + c->asset_map_paths = av_append_path_component(c->base_url,
>> "ASSETMAP.xml");
>> + }
>> +
>> + // Parse each asset map XML file
>> + asset_map_path = strtok(c->asset_map_paths, ",");
>> + while (asset_map_path != NULL) {
>> + av_log(s, AV_LOG_DEBUG, "start parsing IMF Asset Map: %s\n",
>> asset_map_path);
>> +
>> + if ((ret = parse_assetmap(s, asset_map_path, NULL)) < 0)
>> + goto fail;
>> +
>> + asset_map_path = strtok(NULL, ",");
>> + }
>> +
>> + av_log(s, AV_LOG_DEBUG, "parsed IMF Asset Maps\n");
>> +
>> + if ((ret = open_cpl_tracks(s)) != 0) {
>> + goto fail;
>> + }
>> +
>> + av_log(s, AV_LOG_DEBUG, "parsed IMF package\n");
>> + return ret;
>> +
>> +fail:
>> + imf_close(s);
>> + return ret;
>> +}
>> +
>> +static IMFVirtualTrackPlaybackCtx
>> *get_next_track_with_minimum_timestamp(AVFormatContext *s) {
>> + IMFContext *c = s->priv_data;
>> + IMFVirtualTrackPlaybackCtx *track;
>> +
>> + AVRational minimum_timestamp = av_make_q(INT32_MAX, 1);
>> + for (int i = 0; i < c->track_count; ++i) {
>> + av_log(s, AV_LOG_DEBUG, "Compare track %d timestamp "
>> AVRATIONAL_FORMAT " to minimum " AVRATIONAL_FORMAT " (over duration: "
>> AVRATIONAL_FORMAT ")\n", i, AVRATIONAL_ARG(c->tracks[i]->current_timestamp),
>> AVRATIONAL_ARG(minimum_timestamp), AVRATIONAL_ARG(c->tracks[i]->duration));
>> + if (av_cmp_q(c->tracks[i]->current_timestamp, minimum_timestamp) <
>> 0) {
>> + track = c->tracks[i];
>> + minimum_timestamp = track->current_timestamp;
>> + }
>> + }
>> +
>> + av_log(s, AV_LOG_DEBUG, "Found next track to read: %d (timestamp: %lf /
>> %lf)\n", track->index, av_q2d(track->current_timestamp),
>> av_q2d(minimum_timestamp));
>> + return track;
>> +}
>> +
>> +static IMFVirtualTrackResourcePlaybackCtx
>> *get_resource_context_for_timestamp(AVFormatContext *s,
>> IMFVirtualTrackPlaybackCtx *track) {
>> + AVRational edit_unit_duration =
>> av_inv_q(track->resources[0]->resource->base.edit_rate);
>> + AVRational cumulated_duration = av_make_q(0, edit_unit_duration.den);
>> +
>> + av_log(s, AV_LOG_DEBUG, "Looking for track %d resource for timestamp =
>> %lf / %lf\n", track->index, av_q2d(track->current_timestamp),
>> av_q2d(track->duration));
>> + for (int i = 0; i < track->resource_count; ++i) {
>> + cumulated_duration = av_add_q(cumulated_duration,
>> av_make_q((int)track->resources[i]->resource->base.duration *
>> edit_unit_duration.num, edit_unit_duration.den));
>> +
>> + if (av_cmp_q(av_add_q(track->current_timestamp,
>> edit_unit_duration), cumulated_duration) <= 0) {
>> + av_log(s, AV_LOG_DEBUG, "Found resource %d in track %d to read
>> for timestamp %lf (on cumulated=%lf): entry=%ld, duration=%lu, editrate="
>> AVRATIONAL_FORMAT " | edit_unit_duration=%lf\n", i, track->index,
>> av_q2d(track->current_timestamp), av_q2d(cumulated_duration),
>> track->resources[i]->resource->base.entry_point,
>> track->resources[i]->resource->base.duration,
>> AVRATIONAL_ARG(track->resources[i]->resource->base.edit_rate),
>> av_q2d(edit_unit_duration));
>> +
>> + if (track->current_resource_index != i) {
>> + av_log(s, AV_LOG_DEBUG, "Switch resource on track %d:
>> re-open context\n", track->index);
>> + if (track->resources[track->current_resource_index] !=
>> NULL) {
>> +
>> avformat_close_input(&track->resources[track->current_resource_index]->ctx);
>> + }
>> + if (open_track_resource_context(s, track->resources[i]) !=
>> 0) {
>> + return NULL;
>> + }
>> + track->current_resource_index = i;
>> + }
>> + return track->resources[track->current_resource_index];
>> + }
>> + }
>> + return NULL;
>> +}
>> +
>> +static int ff_imf_read_packet(AVFormatContext *s, AVPacket *pkt) {
>> + IMFContext *c = s->priv_data;
>> +
>> + IMFVirtualTrackResourcePlaybackCtx *resource_to_read = NULL;
>> + AVRational edit_unit_duration;
>> + int ret = 0;
>> +
>> + IMFVirtualTrackPlaybackCtx *track_to_read =
>> get_next_track_with_minimum_timestamp(s);
>> + FFStream* track_to_read_stream_internal;
>> +
>> + if (av_cmp_q(track_to_read->current_timestamp, track_to_read->duration)
>> == 0) {
>> + return AVERROR_EOF;
>> + }
>> +
>> + resource_to_read = get_resource_context_for_timestamp(s, track_to_read);
>> +
>> + if (!resource_to_read) {
>> + edit_unit_duration =
>> av_inv_q(track_to_read->resources[track_to_read->current_resource_index]->resource->base.edit_rate);
>> + if (av_cmp_q(av_add_q(track_to_read->current_timestamp,
>> edit_unit_duration), track_to_read->duration) > 0) {
>> + return AVERROR_EOF;
>> + }
>> +
>> + av_log(s, AV_LOG_ERROR, "Could not find IMF track resource to
>> read\n");
>> + return AVERROR_STREAM_NOT_FOUND;
>> + }
>> +
>> + while (!ff_check_interrupt(c->interrupt_callback) && !ret) {
>> + ret = av_read_frame(resource_to_read->ctx, pkt);
>> + av_log(s, AV_LOG_DEBUG, "Got packet: pts=%" PRId64 ", dts=%" PRId64
>> ", duration=%" PRId64 ", stream_index=%d, pos=%" PRId64 "\n", pkt->pts,
>> pkt->dts, pkt->duration, pkt->stream_index, pkt->pos);
>> + track_to_read_stream_internal =
>> ffstream(s->streams[track_to_read->index]);
>> + if (ret >= 0) {
>> + // Update packet info from track
>> + if (pkt->dts < track_to_read_stream_internal->cur_dts &&
>> track_to_read->last_pts > 0) {
>> + pkt->dts = track_to_read_stream_internal->cur_dts;
>> + }
>> +
>> + pkt->pts = track_to_read->last_pts;
>> + pkt->dts = pkt->dts -
>> (int64_t)track_to_read->resources[track_to_read->current_resource_index]->resource->base.entry_point;
>> + pkt->stream_index = track_to_read->index;
>> +
>> + // Update track cursors
>> + track_to_read->current_timestamp =
>> av_add_q(track_to_read->current_timestamp, av_make_q((int)pkt->duration *
>> resource_to_read->ctx->streams[0]->time_base.num,
>> resource_to_read->ctx->streams[0]->time_base.den));
>> + track_to_read->last_pts += pkt->duration;
>> +
>> + return 0;
>> + } else if (ret != AVERROR_EOF) {
>> + av_log(s, AV_LOG_ERROR, "Could not get packet from track %d:
>> %s\n", track_to_read->index, av_err2str(ret));
>> + return ret;
>> + }
>> + }
>> +
>> + return AVERROR_EOF;
>> +}
>> +
>> +static int imf_close(AVFormatContext *s) {
>> + IMFContext *c = s->priv_data;
>> +
>> + av_log(s, AV_LOG_DEBUG, "Close IMF package\n");
>> + av_dict_free(&c->avio_opts);
>> + av_freep(&c->base_url);
>> + imf_asset_locator_map_free(c->asset_locator_map);
>> + imf_cpl_free(c->cpl);
>> +
>> + for (int i = 0; i < c->track_count; ++i) {
>> + imf_virtual_track_playback_context_free(c->tracks[i]);
>> + }
>> +
>> + return 0;
>> +}
>> +
>> +static const AVOption imf_options[] = {
>> + {"assetmaps", "IMF CPL-related asset map comma-separated absolute
>> paths. If not specified, the CPL sibling `ASSETMAP.xml` file is used.",
>> offsetof(IMFContext, asset_map_paths), AV_OPT_TYPE_STRING, {.str = NULL}, 0,
>> 0, AV_OPT_FLAG_DECODING_PARAM},
>> + {NULL}};
>> +
>> +static const AVClass imf_class = {
>> + .class_name = "imf",
>> + .item_name = av_default_item_name,
>> + .option = imf_options,
>> + .version = LIBAVUTIL_VERSION_INT,
>> +};
>> +
>> +const AVInputFormat ff_imf_demuxer = {
>> + .name = "imf",
>> + .long_name = NULL_IF_CONFIG_SMALL("IMF (Interoperable Master Format)"),
>> + .priv_class = &imf_class,
>> + .priv_data_size = sizeof(IMFContext),
>> + .read_header = imf_read_header,
>> + .read_packet = ff_imf_read_packet,
>> + .read_close = imf_close,
>> + .extensions = "xml",
>> + .mime_type = "application/xml,text/xml",
>> +};
>> --
>> 2.17.1
>>
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