On Wed, Oct 20, 2021 at 4:55 PM <p...@sandflow.com> wrote:
> From: Pierre-Anthony Lemieux <p...@sandflow.com>
>
> Signed-off-by: Pierre-Anthony Lemieux <p...@sandflow.com>
> ---
>
> Notes:
> Implements IMF Composition Playlist (CPL) parsing.
>
> libavformat/imf_cpl.c | 666 ++++++++++++++++++++++++++++++++++++++++++
> 1 file changed, 666 insertions(+)
> create mode 100644 libavformat/imf_cpl.c
>
> diff --git a/libavformat/imf_cpl.c b/libavformat/imf_cpl.c
> new file mode 100644
> index 0000000000..8ef574ad78
> --- /dev/null
> +++ b/libavformat/imf_cpl.c
> @@ -0,0 +1,666 @@
> +/*
> + * 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
> + */
> +
> +/**
> + * Implements IMP CPL processing
> + *
> + * @author Pierre-Anthony Lemieux
> + * @file
> + * @ingroup lavu_imf
> + */
> +
> +#include "imf.h"
> +#include "imf_internal.h"
> +#include "libavformat/mxf.h"
> +#include "libavutil/bprint.h"
> +#include "libavutil/error.h"
> +#include <libxml/parser.h>
> +
> +xmlNodePtr xml_get_child_element_by_name(xmlNodePtr parent, const char
> *name_utf8) {
> + xmlNodePtr cur_element;
> +
> + cur_element = xmlFirstElementChild(parent);
> + while (cur_element) {
> + if (xmlStrcmp(cur_element->name, name_utf8) == 0)
> + return cur_element;
> + cur_element = xmlNextElementSibling(cur_element);
> + }
> + return NULL;
> +}
> +
> +int xml_read_UUID(xmlNodePtr element, uint8_t uuid[16]) {
> + xmlChar *element_text = NULL;
> + int scanf_ret;
> + int ret = 0;
> +
> + element_text = xmlNodeListGetString(element->doc,
> element->xmlChildrenNode, 1);
> + scanf_ret = sscanf(element_text,
> + UUID_FORMAT,
> + &uuid[0],
> + &uuid[1],
> + &uuid[2],
> + &uuid[3],
> + &uuid[4],
> + &uuid[5],
> + &uuid[6],
> + &uuid[7],
> + &uuid[8],
> + &uuid[9],
> + &uuid[10],
> + &uuid[11],
> + &uuid[12],
> + &uuid[13],
> + &uuid[14],
> + &uuid[15]);
> + if (scanf_ret != 16) {
> + av_log(NULL, AV_LOG_ERROR, "Invalid UUID\n");
> + ret = AVERROR_INVALIDDATA;
> + }
> + xmlFree(element_text);
> +
> + return ret;
> +}
> +
> +int xml_read_rational(xmlNodePtr element, AVRational *rational) {
> + xmlChar *element_text = NULL;
> + int ret = 0;
> +
> + element_text = xmlNodeListGetString(element->doc,
> element->xmlChildrenNode, 1);
> + if (sscanf(element_text, "%i %i", &rational->num, &rational->den) !=
> 2) {
> + av_log(NULL, AV_LOG_ERROR, "Invalid rational number\n");
> + ret = AVERROR_INVALIDDATA;
> + }
> + xmlFree(element_text);
> +
> + return ret;
> +}
> +
> +int xml_read_ulong(xmlNodePtr element, unsigned long *number) {
> + xmlChar *element_text = NULL;
> + int ret = 0;
> +
> + element_text = xmlNodeListGetString(element->doc,
> element->xmlChildrenNode, 1);
> + if (sscanf(element_text, "%lu", number) != 1) {
> + av_log(NULL, AV_LOG_ERROR, "Invalid unsigned long");
> + ret = AVERROR_INVALIDDATA;
> + }
> + xmlFree(element_text);
> +
> + return ret;
> +}
> +
> +static void imf_base_virtual_track_init(IMFBaseVirtualTrack *track) {
> + memset(track->id_uuid, 0, sizeof(track->id_uuid));
> +}
> +
> +static void imf_marker_virtual_track_init(IMFMarkerVirtualTrack *track) {
> + imf_base_virtual_track_init((IMFBaseVirtualTrack *)track);
> + track->resource_count = 0;
> + track->resources = NULL;
> +}
> +
> +static void imf_trackfile_virtual_track_init(IMFTrackFileVirtualTrack
> *track) {
> + imf_base_virtual_track_init((IMFBaseVirtualTrack *)track);
> + track->resource_count = 0;
> + track->resources = NULL;
> +}
> +
> +static void imf_base_resource_init(IMFBaseResource *rsrc) {
> + rsrc->duration = 0;
> + rsrc->edit_rate = av_make_q(0, 0);
> + rsrc->entry_point = 0;
> + rsrc->repeat_count = 1;
> +}
> +
> +static void imf_marker_resource_init(IMFMarkerResource *rsrc) {
> + imf_base_resource_init((IMFBaseResource *)rsrc);
> + rsrc->marker_count = 0;
> + rsrc->markers = NULL;
> +}
> +
> +static void imf_marker_init(IMFMarker *marker) {
> + marker->label_utf8 = NULL;
> + marker->offset = 0;
> + marker->scope_utf8 = NULL;
> +}
> +
> +static void imf_trackfile_resource_init(IMFTrackFileResource *rsrc) {
> + imf_base_resource_init((IMFBaseResource *)rsrc);
> + memset(rsrc->track_file_uuid, 0, sizeof(rsrc->track_file_uuid));
> +}
> +
> +static int fill_content_title(xmlNodePtr cpl_element, IMFCPL *cpl) {
> + xmlNodePtr element = NULL;
> +
> + if (!(element = xml_get_child_element_by_name(cpl_element,
> "ContentTitle"))) {
> + av_log(NULL, AV_LOG_ERROR, "ContentTitle element not found in the
> IMF CPL\n");
> + return AVERROR_INVALIDDATA;
> + }
> + cpl->content_title_utf8 = xmlNodeListGetString(cpl_element->doc,
> element->xmlChildrenNode, 1);
> +
> + return 0;
> +}
> +
> +static int fill_edit_rate(xmlNodePtr cpl_element, IMFCPL *cpl) {
> + xmlNodePtr element = NULL;
> +
> + if (!(element = xml_get_child_element_by_name(cpl_element,
> "EditRate"))) {
> + av_log(NULL, AV_LOG_ERROR, "EditRate element not found in the IMF
> CPL\n");
> + return AVERROR_INVALIDDATA;
> + }
> +
> + return xml_read_rational(element, &cpl->edit_rate);
> +}
> +
> +static int fill_id(xmlNodePtr cpl_element, IMFCPL *cpl) {
> + xmlNodePtr element = NULL;
> +
> + if (!(element = xml_get_child_element_by_name(cpl_element, "Id"))) {
> + av_log(NULL, AV_LOG_ERROR, "Id element not found in the IMF
> CPL\n");
> + return AVERROR_INVALIDDATA;
> + }
> +
> + return xml_read_UUID(element, cpl->id_uuid);
> +}
> +
> +static int fill_marker(xmlNodePtr marker_elem, IMFMarker *marker) {
> + xmlNodePtr element = NULL;
> + int ret = 0;
> +
> + /* read Offset */
> + if (!(element = xml_get_child_element_by_name(marker_elem,
> "Offset"))) {
> + av_log(NULL, AV_LOG_ERROR, "Offset element not found in a
> Marker\n");
> + return AVERROR_INVALIDDATA;
> + }
> + if ((ret = xml_read_ulong(element, &marker->offset)))
> + return ret;
> +
> + /* read Label and Scope */
> + if (!(element = xml_get_child_element_by_name(marker_elem, "Label")))
> {
> + av_log(NULL, AV_LOG_ERROR, "Label element not found in a
> Marker\n");
> + return AVERROR_INVALIDDATA;
> + }
> + if (!(marker->label_utf8 = xmlNodeListGetString(element->doc,
> element->xmlChildrenNode, 1))) {
> + av_log(NULL, AV_LOG_ERROR, "Empty Label element found in a
> Marker\n");
> + return AVERROR_INVALIDDATA;
> + }
> + if (!(marker->scope_utf8 = xmlGetNoNsProp(element, "scope"))) {
> + marker->scope_utf8 = xmlCharStrdup("
> http://www.smpte-ra.org/schemas/2067-3/2013#standard-markers";);
> + }
> +
> + return ret;
> +}
> +
> +static int fill_base_resource(xmlNodePtr resource_elem, IMFBaseResource
> *resource, IMFCPL *cpl) {
> + xmlNodePtr element = NULL;
> + int ret = 0;
> +
> + /* read EditRate */
> + if (!(element = xml_get_child_element_by_name(resource_elem,
> "EditRate"))) {
> + resource->edit_rate = cpl->edit_rate;
> + } else if (ret = xml_read_rational(element, &resource->edit_rate)) {
> + av_log(NULL, AV_LOG_ERROR, "Invalid EditRate element found in a
> Resource\n");
> + return ret;
> + }
> +
> + /* read EntryPoint */
> + if (element = xml_get_child_element_by_name(resource_elem,
> "EntryPoint")) {
> + if (ret = xml_read_ulong(element, &resource->entry_point)) {
> + av_log(NULL, AV_LOG_ERROR, "Invalid EntryPoint element found
> in a Resource\n");
> + return ret;
> + }
> + } else
> + resource->entry_point = 0;
> +
> + /* read IntrinsicDuration */
> + if (!(element = xml_get_child_element_by_name(resource_elem,
> "IntrinsicDuration"))) {
> + av_log(NULL, AV_LOG_ERROR, "IntrinsicDuration element missing
> from Resource\n");
> + return AVERROR_INVALIDDATA;
> + }
> + if (ret = xml_read_ulong(element, &resource->duration)) {
> + av_log(NULL, AV_LOG_ERROR, "Invalid IntrinsicDuration element
> found in a Resource\n");
> + return ret;
> + }
> + resource->duration -= resource->entry_point;
> +
> + /* read SourceDuration */
> + if (element = xml_get_child_element_by_name(resource_elem,
> "SourceDuration")) {
> + if (ret = xml_read_ulong(element, &resource->duration)) {
> + av_log(NULL, AV_LOG_ERROR, "SourceDuration element missing
> from Resource\n");
> + return ret;
> + }
> + }
> +
> + /* read RepeatCount */
> + if (element = xml_get_child_element_by_name(resource_elem,
> "RepeatCount")) {
> + ret = xml_read_ulong(element, &resource->repeat_count);
> + }
> +
> + return ret;
> +}
> +
> +static int fill_trackfile_resource(xmlNodePtr tf_resource_elem,
> IMFTrackFileResource *tf_resource, IMFCPL *cpl) {
> + xmlNodePtr element = NULL;
> + int ret = 0;
> +
> + if (ret = fill_base_resource(tf_resource_elem, (IMFBaseResource
> *)tf_resource, cpl))
> + return ret;
> +
> + /* read TrackFileId */
> + if (element = xml_get_child_element_by_name(tf_resource_elem,
> "TrackFileId")) {
> + if (ret = xml_read_UUID(element, tf_resource->track_file_uuid)) {
> + av_log(NULL, AV_LOG_ERROR, "Invalid TrackFileId element found
> in Resource\n");
> + return ret;
> + }
> + } else {
> + av_log(NULL, AV_LOG_ERROR, "TrackFileId element missing from
> Resource\n");
> + return AVERROR_INVALIDDATA;
> + }
> +
> + return ret;
> +}
> +
> +static int fill_marker_resource(xmlNodePtr marker_resource_elem,
> IMFMarkerResource *marker_resource, IMFCPL *cpl) {
> + xmlNodePtr element = NULL;
> + int ret = 0;
> +
> + if (ret = fill_base_resource(marker_resource_elem, (IMFBaseResource
> *)marker_resource, cpl))
> + return ret;
> +
> + /* read markers */
> + element = xmlFirstElementChild(marker_resource_elem);
> + while (element) {
> + if (xmlStrcmp(element->name, "Marker") == 0) {
> + marker_resource->markers =
> av_realloc(marker_resource->markers, (++marker_resource->marker_count) *
> sizeof(IMFMarker));
> + if (!marker_resource->markers) {
> + av_log(NULL, AV_LOG_PANIC, "Cannot allocate Marker\n");
> + exit(1);
>
exit() should not be used.
> + }
> +
> imf_marker_init(&marker_resource->markers[marker_resource->marker_count -
> 1]);
> + fill_marker(element,
> &marker_resource->markers[marker_resource->marker_count - 1]);
> + }
> + element = xmlNextElementSibling(element);
> + }
> +
> + return ret;
> +}
> +
> +static int push_marker_sequence(xmlNodePtr marker_sequence_elem, IMFCPL
> *cpl) {
> + int ret = 0;
> + uint8_t uuid[16];
> + xmlNodePtr resource_list_elem = NULL;
> + xmlNodePtr resource_elem = NULL;
> + xmlNodePtr track_id_elem = NULL;
> +
> + /* read TrackID element */
> + if (!(track_id_elem =
> xml_get_child_element_by_name(marker_sequence_elem, "TrackId"))) {
> + av_log(NULL, AV_LOG_ERROR, "TrackId element missing from
> Sequence\n");
> + return AVERROR_INVALIDDATA;
> + }
> + if (ret = xml_read_UUID(track_id_elem, uuid)) {
> + av_log(NULL, AV_LOG_ERROR, "Invalid TrackId element found in
> Sequence\n");
> + return AVERROR_INVALIDDATA;
> + }
> + av_log(NULL, AV_LOG_DEBUG, "Processing IMF CPL Marker Sequence for
> Virtual Track " UUID_FORMAT "\n", UID_ARG(uuid));
> +
> + /* create main marker virtual track if it does not exist */
> + if (!cpl->main_markers_track) {
> + cpl->main_markers_track =
> av_malloc(sizeof(IMFMarkerVirtualTrack));
> + if (!cpl->main_markers_track) {
> + av_log(NULL, AV_LOG_PANIC, "Cannot allocate Marker Virtual
> Track\n");
> + exit(1);
> + }
> + imf_marker_virtual_track_init(cpl->main_markers_track);
> + memcpy(cpl->main_markers_track->base.id_uuid, uuid, sizeof(uuid));
> + } else if (memcmp(cpl->main_markers_track->base.id_uuid, uuid,
> sizeof(uuid)) != 0) {
> + av_log(NULL, AV_LOG_ERROR, "Multiple marker virtual tracks were
> found\n");
> + return AVERROR_INVALIDDATA;
> + }
> +
> + /* process resources */
> + resource_list_elem =
> xml_get_child_element_by_name(marker_sequence_elem, "ResourceList");
> + if (!resource_list_elem)
> + return 0;
> + resource_elem = xmlFirstElementChild(resource_list_elem);
> + while (resource_elem) {
> + cpl->main_markers_track->resources =
> av_realloc(cpl->main_markers_track->resources,
> (++cpl->main_markers_track->resource_count) * sizeof(IMFMarkerResource));
> + if (!cpl->main_markers_track->resources) {
> + av_log(NULL, AV_LOG_PANIC, "Cannot allocate Resource\n");
> + exit(1);
> + }
> +
> imf_marker_resource_init(&cpl->main_markers_track->resources[cpl->main_markers_track->resource_count
> - 1]);
> + fill_marker_resource(resource_elem,
> &cpl->main_markers_track->resources[cpl->main_markers_track->resource_count
> - 1], cpl);
> + resource_elem = xmlNextElementSibling(resource_elem);
> + }
> +
> + return ret;
> +}
> +
> +static int has_stereo_resources(xmlNodePtr element) {
> + if (xmlStrcmp(element->name, "Left") == 0 || xmlStrcmp(element->name,
> "Right") == 0)
> + return 1;
> + element = xmlFirstElementChild(element);
> + while (element) {
> + if (has_stereo_resources(element))
> + return 1;
> + element = xmlNextElementSibling(element);
> + }
> + return 0;
> +}
> +
> +static int push_main_audio_sequence(xmlNodePtr audio_sequence_elem,
> IMFCPL *cpl) {
> + int ret = 0;
> + uint8_t uuid[16];
> + xmlNodePtr resource_list_elem = NULL;
> + xmlNodePtr resource_elem = NULL;
> + xmlNodePtr track_id_elem = NULL;
> + IMFTrackFileVirtualTrack *vt = NULL;
> +
> + /* read TrackID element */
> + if (!(track_id_elem =
> xml_get_child_element_by_name(audio_sequence_elem, "TrackId"))) {
> + av_log(NULL, AV_LOG_ERROR, "TrackId element missing from audio
> sequence\n");
> + return AVERROR_INVALIDDATA;
> + }
> + if (ret = xml_read_UUID(track_id_elem, uuid)) {
> + av_log(NULL, AV_LOG_ERROR, "Invalid TrackId element found in
> audio sequence\n");
> + return ret;
> + }
> + av_log(NULL, AV_LOG_DEBUG, "Processing IMF CPL Audio Sequence for
> Virtual Track " UUID_FORMAT "\n", UID_ARG(uuid));
> +
> + /* get the main audio virtual track corresponding to the sequence */
> + for (int i = 0; i < cpl->main_audio_track_count; i++)
> + if (memcmp(cpl->main_audio_tracks[i].base.id_uuid, uuid,
> sizeof(uuid)) == 0) {
> + vt = &cpl->main_audio_tracks[i];
> + break;
> + }
> +
> + /* create a main audio virtual track if none exists for the sequence
> */
> + if (!vt) {
> + cpl->main_audio_tracks = av_realloc(cpl->main_audio_tracks,
> sizeof(IMFTrackFileVirtualTrack) * (++cpl->main_audio_track_count));
> + if (!cpl->main_audio_tracks) {
> + av_log(NULL, AV_LOG_PANIC, "Cannot allocate MainAudio virtual
> track\n");
> + exit(1);
> + }
> + vt = &cpl->main_audio_tracks[cpl->main_audio_track_count - 1];
> + imf_trackfile_virtual_track_init(vt);
> + memcpy(vt->base.id_uuid, uuid, sizeof(uuid));
> + }
> +
> + /* process resources */
> + resource_list_elem =
> xml_get_child_element_by_name(audio_sequence_elem, "ResourceList");
> + if (!resource_list_elem)
> + return 0;
> + resource_elem = xmlFirstElementChild(resource_list_elem);
> + while (resource_elem) {
> + vt->resources = av_realloc(vt->resources, (++vt->resource_count)
> * sizeof(IMFTrackFileResource));
> + if (!vt->resources) {
> + av_log(NULL, AV_LOG_PANIC, "Cannot allocate Resource\n");
> + exit(1);
> + }
> + imf_trackfile_resource_init(&vt->resources[vt->resource_count -
> 1]);
> + fill_trackfile_resource(resource_elem,
> &vt->resources[vt->resource_count - 1], cpl);
> + resource_elem = xmlNextElementSibling(resource_elem);
> + }
> +
> + return ret;
> +}
> +
> +static int push_main_image_2d_sequence(xmlNodePtr image_sequence_elem,
> IMFCPL *cpl) {
> + int ret = 0;
> + uint8_t uuid[16];
> + xmlNodePtr resource_list_elem = NULL;
> + xmlNodePtr resource_elem = NULL;
> + xmlNodePtr track_id_elem = NULL;
> +
> + /* skip stereoscopic resources */
> + if (has_stereo_resources(image_sequence_elem)) {
> + av_log(NULL, AV_LOG_ERROR, "Stereoscopic 3D image virtual tracks
> not supported\n");
> + return AVERROR_PATCHWELCOME;
> + }
> +
> + /* read TrackId element*/
> + if (!(track_id_elem =
> xml_get_child_element_by_name(image_sequence_elem, "TrackId"))) {
> + av_log(NULL, AV_LOG_ERROR, "TrackId element missing from audio
> sequence\n");
> + return AVERROR_INVALIDDATA;
> + }
> + if (ret = xml_read_UUID(track_id_elem, uuid)) {
> + av_log(NULL, AV_LOG_ERROR, "Invalid TrackId element found in
> audio sequence\n");
> + return ret;
> + }
> +
> + /* create main image virtual track if one does not exist */
> + if (!cpl->main_image_2d_track) {
> + cpl->main_image_2d_track =
> av_malloc(sizeof(IMFTrackFileVirtualTrack));
> + if (!cpl->main_image_2d_track) {
> + av_log(NULL, AV_LOG_PANIC, "Cannot allocate MainImage virtual
> track\n");
> + exit(1);
> + }
> + imf_trackfile_virtual_track_init(cpl->main_image_2d_track);
> + memcpy(cpl->main_image_2d_track->base.id_uuid, uuid,
> sizeof(uuid));
> + } else if (memcmp(cpl->main_image_2d_track->base.id_uuid, uuid,
> sizeof(uuid)) != 0) {
> + av_log(NULL, AV_LOG_ERROR, "Multiple MainImage virtual tracks
> found\n");
> + return AVERROR_INVALIDDATA;
> + }
> + av_log(NULL, AV_LOG_DEBUG, "Processing IMF CPL Main Image Sequence
> for Virtual Track " UUID_FORMAT "\n", UID_ARG(uuid));
> +
> + /* process resources */
> + if (!(resource_list_elem =
> xml_get_child_element_by_name(image_sequence_elem, "ResourceList")))
> + return 0;
> + resource_elem = xmlFirstElementChild(resource_list_elem);
> + while (resource_elem) {
> + cpl->main_image_2d_track->resources =
> av_realloc(cpl->main_image_2d_track->resources,
> (++cpl->main_image_2d_track->resource_count) *
> sizeof(IMFTrackFileResource));
> + if (!cpl->main_image_2d_track->resources) {
> + av_log(NULL, AV_LOG_PANIC, "Cannot allocate Resource\n");
> + exit(1);
> + }
> +
> imf_trackfile_resource_init(&cpl->main_image_2d_track->resources[cpl->main_image_2d_track->resource_count
> - 1]);
> + fill_trackfile_resource(resource_elem,
> &cpl->main_image_2d_track->resources[cpl->main_image_2d_track->resource_count
> - 1], cpl);
> + resource_elem = xmlNextElementSibling(resource_elem);
> + }
> +
> + return 0;
> +}
> +
> +static int fill_virtual_tracks(xmlNodePtr cpl_element, IMFCPL *cpl) {
> + int ret = 0;
> + xmlNodePtr segment_list_elem = NULL;
> + xmlNodePtr segment_elem = NULL;
> + xmlNodePtr sequence_list_elem = NULL;
> + xmlNodePtr sequence_elem = NULL;
> +
> + if (!(segment_list_elem = xml_get_child_element_by_name(cpl_element,
> "SegmentList"))) {
> + av_log(NULL, AV_LOG_ERROR, "SegmentList element missing\n");
> + return AVERROR_INVALIDDATA;
> + }
> +
> + /* process sequences */
> + segment_elem = xmlFirstElementChild(segment_list_elem);
> + while (segment_elem) {
> + av_log(NULL, AV_LOG_DEBUG, "Processing IMF CPL Segment\n");
> + sequence_list_elem = xml_get_child_element_by_name(segment_elem,
> "SequenceList");
> + if (!segment_list_elem)
> + continue;
> + sequence_elem = xmlFirstElementChild(sequence_list_elem);
> + while (sequence_elem) {
> + if (xmlStrcmp(sequence_elem->name, "MarkerSequence") == 0)
> + push_marker_sequence(sequence_elem, cpl);
> + else if (xmlStrcmp(sequence_elem->name, "MainImageSequence")
> == 0)
> + push_main_image_2d_sequence(sequence_elem, cpl);
> + else if (xmlStrcmp(sequence_elem->name, "MainAudioSequence")
> == 0)
> + push_main_audio_sequence(sequence_elem, cpl);
> + else {
> + av_log(NULL, AV_LOG_INFO, "The following Sequence is not
> supported and is ignored: %s\n", sequence_elem->name);
> + }
> + sequence_elem = xmlNextElementSibling(sequence_elem);
> + }
> + segment_elem = xmlNextElementSibling(segment_elem);
> + }
> +
> + return ret;
> +}
> +
> +int parse_imf_cpl_from_xml_dom(xmlDocPtr doc, IMFCPL **cpl) {
> + int ret = 0;
> + xmlNodePtr cpl_element = NULL;
> +
> + *cpl = imf_cpl_alloc();
> + if (!*cpl) {
> + av_log(NULL, AV_LOG_FATAL, "Cannot allocate CPL\n");
> + ret = AVERROR_BUG;
> + goto cleanup;
> + }
> + cpl_element = xmlDocGetRootElement(doc);
> + if (xmlStrcmp(cpl_element->name, "CompositionPlaylist")) {
> + av_log(NULL, AV_LOG_ERROR, "The root element of the CPL is not
> CompositionPlaylist\n");
> + ret = AVERROR_INVALIDDATA;
> + goto cleanup;
> + }
> + if (ret = fill_content_title(cpl_element, *cpl))
> + goto cleanup;
> + if (ret = fill_id(cpl_element, *cpl))
> + goto cleanup;
> + if (ret = fill_edit_rate(cpl_element, *cpl))
> + goto cleanup;
> + if (ret = fill_virtual_tracks(cpl_element, *cpl))
> + goto cleanup;
> +
> +cleanup:
> + if (*cpl && ret) {
> + imf_cpl_free(*cpl);
> + *cpl = NULL;
> + }
> + return ret;
> +}
> +
> +static void imf_marker_free(IMFMarker *marker) {
> + if (!marker)
> + return;
> + xmlFree(marker->label_utf8);
> + xmlFree(marker->scope_utf8);
> +}
> +
> +static void imf_marker_resource_free(IMFMarkerResource *rsrc) {
> + if (!rsrc)
> + return;
> + for (unsigned long i = 0; i < rsrc->marker_count; i++)
> + imf_marker_free(&rsrc->markers[i]);
> + av_free(rsrc->markers);
> +}
> +
> +static void imf_marker_virtual_track_free(IMFMarkerVirtualTrack *vt) {
> + if (!vt)
> + return;
> + for (unsigned long i = 0; i < vt->resource_count; i++)
> + imf_marker_resource_free(&vt->resources[i]);
> + av_free(vt->resources);
> +}
> +
> +static void imf_trackfile_virtual_track_free(IMFTrackFileVirtualTrack
> *vt) {
> + if (!vt)
> + return;
> + av_free(vt->resources);
> +}
> +
> +static void imf_cpl_init(IMFCPL *cpl) {
> + memset(cpl->id_uuid, 0, sizeof(cpl->id_uuid));
> + cpl->content_title_utf8 = NULL;
> + cpl->edit_rate = av_make_q(0, 0);
> + cpl->main_markers_track = NULL;
> + cpl->main_image_2d_track = NULL;
> + cpl->main_audio_track_count = 0;
> + cpl->main_audio_tracks = NULL;
> +}
> +
> +IMFCPL *imf_cpl_alloc(void) {
> + IMFCPL *cpl;
> +
> + cpl = av_malloc(sizeof(IMFCPL));
> + if (!cpl)
> + return NULL;
> + imf_cpl_init(cpl);
> + return cpl;
> +}
> +
> +void imf_cpl_free(IMFCPL *cpl) {
> + if (cpl) {
> + xmlFree(cpl->content_title_utf8);
> + imf_marker_virtual_track_free(cpl->main_markers_track);
> + imf_trackfile_virtual_track_free(cpl->main_image_2d_track);
> + for (unsigned long i = 0; i < cpl->main_audio_track_count; i++)
> + imf_trackfile_virtual_track_free(&cpl->main_audio_tracks[i]);
> + }
> + av_free(cpl);
> + cpl = NULL;
> +}
> +
> +int parse_imf_cpl(AVIOContext *in, IMFCPL **cpl) {
> + AVBPrint buf;
> + xmlDoc *doc = NULL;
> + int ret = 0;
> + int64_t filesize = 0;
> +
> + filesize = avio_size(in);
> + filesize = filesize > 0 ? filesize : 8192;
> + av_bprint_init(&buf, filesize + 1, AV_BPRINT_SIZE_UNLIMITED);
> + if ((ret = avio_read_to_bprint(in, &buf, UINT_MAX - 1)) < 0 ||
> !avio_feof(in) || (filesize = buf.len) == 0) {
> + if (ret == 0) {
> + av_log(NULL, AV_LOG_ERROR, "Cannot read IMF CPL\n");
> + return AVERROR_INVALIDDATA;
> + }
> + } else {
> + LIBXML_TEST_VERSION
> + doc = xmlReadMemory(buf.str, filesize, NULL, NULL, 0);
> + if (!doc) {
> + av_log(NULL, AV_LOG_ERROR, "XML parsing failed when reading
> the IMF CPL\n");
> + ret = AVERROR_INVALIDDATA;
> + }
> + if (ret = parse_imf_cpl_from_xml_dom(doc, cpl)) {
> + av_log(NULL, AV_LOG_ERROR, "Cannot parse IMF CPL\n");
> + } else {
> + av_log(NULL, AV_LOG_INFO, "IMF CPL ContentTitle: %s\n",
> (*cpl)->content_title_utf8);
> + av_log(NULL, AV_LOG_INFO, "IMF CPL Id: " UUID_FORMAT "\n",
> UID_ARG((*cpl)->id_uuid));
> + }
> + xmlFreeDoc(doc);
> + xmlCleanupParser();
> + }
> +
> + return ret;
> +}
> --
> 2.17.1
>
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