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ffmpeg/libavformat/imf_cpl.c

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/*
* 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
*/
/*
*
* 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.
*/
/**
* Implements IMP CPL processing
*
* @author Pierre-Anthony Lemieux
* @file
* @ingroup lavu_imf
*/
#include "imf.h"
#include "libavformat/mxf.h"
#include "libavutil/bprint.h"
#include "libavutil/error.h"
#include <libxml/parser.h>
xmlNodePtr ff_imf_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 ff_imf_xml_read_uuid(xmlNodePtr element, AVUUID uuid)
{
xmlChar *element_text = NULL;
int ret = 0;
element_text = xmlNodeListGetString(element->doc, element->xmlChildrenNode, 1);
ret = av_uuid_urn_parse(element_text, uuid);
if (ret) {
av_log(NULL, AV_LOG_ERROR, "Invalid UUID\n");
ret = AVERROR_INVALIDDATA;
}
xmlFree(element_text);
return ret;
}
int ff_imf_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 ff_imf_xml_read_uint32(xmlNodePtr element, uint32_t *number)
{
xmlChar *element_text = NULL;
int ret = 0;
element_text = xmlNodeListGetString(element->doc, element->xmlChildrenNode, 1);
if (sscanf(element_text, "%" PRIu32, number) != 1) {
av_log(NULL, AV_LOG_ERROR, "Invalid unsigned 32-bit integer");
ret = AVERROR_INVALIDDATA;
}
xmlFree(element_text);
return ret;
}
static void imf_base_virtual_track_init(FFIMFBaseVirtualTrack *track)
{
memset(track->id_uuid, 0, sizeof(track->id_uuid));
}
static void imf_marker_virtual_track_init(FFIMFMarkerVirtualTrack *track)
{
imf_base_virtual_track_init((FFIMFBaseVirtualTrack *)track);
track->resource_count = 0;
track->resources = NULL;
}
static void imf_trackfile_virtual_track_init(FFIMFTrackFileVirtualTrack *track)
{
imf_base_virtual_track_init((FFIMFBaseVirtualTrack *)track);
track->resource_count = 0;
track->resources_alloc_sz = 0;
track->resources = NULL;
}
static void imf_base_resource_init(FFIMFBaseResource *rsrc)
{
rsrc->duration = 0;
rsrc->edit_rate = av_make_q(0, 1);
rsrc->entry_point = 0;
rsrc->repeat_count = 1;
}
static void imf_marker_resource_init(FFIMFMarkerResource *rsrc)
{
imf_base_resource_init((FFIMFBaseResource *)rsrc);
rsrc->marker_count = 0;
rsrc->markers = NULL;
}
static void imf_marker_init(FFIMFMarker *marker)
{
marker->label_utf8 = NULL;
marker->offset = 0;
marker->scope_utf8 = NULL;
}
static void imf_trackfile_resource_init(FFIMFTrackFileResource *rsrc)
{
imf_base_resource_init((FFIMFBaseResource *)rsrc);
memset(rsrc->track_file_uuid, 0, sizeof(rsrc->track_file_uuid));
}
static int fill_content_title(xmlNodePtr cpl_element, FFIMFCPL *cpl)
{
xmlNodePtr element = NULL;
if (!(element = ff_imf_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, FFIMFCPL *cpl)
{
xmlNodePtr element = NULL;
if (!(element = ff_imf_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 ff_imf_xml_read_rational(element, &cpl->edit_rate);
}
static int fill_id(xmlNodePtr cpl_element, FFIMFCPL *cpl)
{
xmlNodePtr element = NULL;
if (!(element = ff_imf_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 ff_imf_xml_read_uuid(element, cpl->id_uuid);
}
static int fill_marker(xmlNodePtr marker_elem, FFIMFMarker *marker)
{
xmlNodePtr element = NULL;
int ret = 0;
/* read Offset */
if (!(element = ff_imf_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 = ff_imf_xml_read_uint32(element, &marker->offset)))
return ret;
/* read Label and Scope */
if (!(element = ff_imf_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");
if (!marker->scope_utf8) {
xmlFree(marker->label_utf8);
return AVERROR(ENOMEM);
}
}
return ret;
}
static int fill_base_resource(xmlNodePtr resource_elem, FFIMFBaseResource *resource, FFIMFCPL *cpl)
{
xmlNodePtr element = NULL;
int ret = 0;
/* read EditRate */
if (!(element = ff_imf_xml_get_child_element_by_name(resource_elem, "EditRate"))) {
resource->edit_rate = cpl->edit_rate;
} else if ((ret = ff_imf_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 = ff_imf_xml_get_child_element_by_name(resource_elem, "EntryPoint"))) {
if ((ret = ff_imf_xml_read_uint32(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 = ff_imf_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 = ff_imf_xml_read_uint32(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 = ff_imf_xml_get_child_element_by_name(resource_elem, "SourceDuration"))) {
if ((ret = ff_imf_xml_read_uint32(element, &resource->duration))) {
av_log(NULL, AV_LOG_ERROR, "SourceDuration element missing from Resource\n");
return ret;
}
}
/* read RepeatCount */
if ((element = ff_imf_xml_get_child_element_by_name(resource_elem, "RepeatCount")))
ret = ff_imf_xml_read_uint32(element, &resource->repeat_count);
return ret;
}
static int fill_trackfile_resource(xmlNodePtr tf_resource_elem,
FFIMFTrackFileResource *tf_resource,
FFIMFCPL *cpl)
{
xmlNodePtr element = NULL;
int ret = 0;
if ((ret = fill_base_resource(tf_resource_elem, (FFIMFBaseResource *)tf_resource, cpl)))
return ret;
/* read TrackFileId */
if ((element = ff_imf_xml_get_child_element_by_name(tf_resource_elem, "TrackFileId"))) {
if ((ret = ff_imf_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,
FFIMFMarkerResource *marker_resource,
FFIMFCPL *cpl)
{
xmlNodePtr element = NULL;
int ret = 0;
if ((ret = fill_base_resource(marker_resource_elem, (FFIMFBaseResource *)marker_resource, cpl)))
return ret;
/* read markers */
element = xmlFirstElementChild(marker_resource_elem);
while (element) {
if (xmlStrcmp(element->name, "Marker") == 0) {
void *tmp;
if (marker_resource->marker_count == UINT32_MAX)
return AVERROR(ENOMEM);
tmp = av_realloc_array(marker_resource->markers,
marker_resource->marker_count + 1,
sizeof(FFIMFMarker));
if (!tmp)
return AVERROR(ENOMEM);
marker_resource->markers = tmp;
imf_marker_init(&marker_resource->markers[marker_resource->marker_count]);
ret = fill_marker(element,
&marker_resource->markers[marker_resource->marker_count]);
marker_resource->marker_count++;
if (ret)
return ret;
}
element = xmlNextElementSibling(element);
}
return ret;
}
static int push_marker_sequence(xmlNodePtr marker_sequence_elem, FFIMFCPL *cpl)
{
int ret = 0;
AVUUID uuid;
xmlNodePtr resource_list_elem = NULL;
xmlNodePtr resource_elem = NULL;
xmlNodePtr track_id_elem = NULL;
unsigned long resource_elem_count;
void *tmp;
/* read TrackID element */
if (!(track_id_elem = ff_imf_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 (ff_imf_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 " AV_PRI_UUID "\n",
AV_UUID_ARG(uuid));
/* create main marker virtual track if it does not exist */
if (!cpl->main_markers_track) {
cpl->main_markers_track = av_malloc(sizeof(FFIMFMarkerVirtualTrack));
if (!cpl->main_markers_track)
return AVERROR(ENOMEM);
imf_marker_virtual_track_init(cpl->main_markers_track);
av_uuid_copy(cpl->main_markers_track->base.id_uuid, uuid);
} else if (!av_uuid_equal(cpl->main_markers_track->base.id_uuid, uuid)) {
av_log(NULL, AV_LOG_ERROR, "Multiple marker virtual tracks were found\n");
return AVERROR_INVALIDDATA;
}
/* process resources */
resource_list_elem = ff_imf_xml_get_child_element_by_name(marker_sequence_elem, "ResourceList");
if (!resource_list_elem)
return 0;
resource_elem_count = xmlChildElementCount(resource_list_elem);
if (resource_elem_count > UINT32_MAX
|| cpl->main_markers_track->resource_count > UINT32_MAX - resource_elem_count)
return AVERROR(ENOMEM);
tmp = av_realloc_array(cpl->main_markers_track->resources,
cpl->main_markers_track->resource_count + resource_elem_count,
sizeof(FFIMFMarkerResource));
if (!tmp) {
av_log(NULL, AV_LOG_ERROR, "Cannot allocate Marker Resources\n");
return AVERROR(ENOMEM);
}
cpl->main_markers_track->resources = tmp;
resource_elem = xmlFirstElementChild(resource_list_elem);
while (resource_elem) {
imf_marker_resource_init(&cpl->main_markers_track->resources[cpl->main_markers_track->resource_count]);
ret = fill_marker_resource(resource_elem,
&cpl->main_markers_track->resources[cpl->main_markers_track->resource_count],
cpl);
cpl->main_markers_track->resource_count++;
if (ret)
return ret;
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, FFIMFCPL *cpl)
{
int ret = 0;
AVUUID uuid;
xmlNodePtr resource_list_elem = NULL;
xmlNodePtr resource_elem = NULL;
xmlNodePtr track_id_elem = NULL;
unsigned long resource_elem_count;
FFIMFTrackFileVirtualTrack *vt = NULL;
void *tmp;
/* read TrackID element */
if (!(track_id_elem = ff_imf_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 = ff_imf_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 " AV_PRI_UUID "\n",
AV_UUID_ARG(uuid));
/* get the main audio virtual track corresponding to the sequence */
for (uint32_t i = 0; i < cpl->main_audio_track_count; i++) {
if (av_uuid_equal(cpl->main_audio_tracks[i].base.id_uuid, uuid)) {
vt = &cpl->main_audio_tracks[i];
break;
}
}
/* create a main audio virtual track if none exists for the sequence */
if (!vt) {
if (cpl->main_audio_track_count == UINT32_MAX)
return AVERROR(ENOMEM);
tmp = av_realloc_array(cpl->main_audio_tracks,
cpl->main_audio_track_count + 1,
sizeof(FFIMFTrackFileVirtualTrack));
if (!tmp)
return AVERROR(ENOMEM);
cpl->main_audio_tracks = tmp;
vt = &cpl->main_audio_tracks[cpl->main_audio_track_count];
imf_trackfile_virtual_track_init(vt);
cpl->main_audio_track_count++;
av_uuid_copy(vt->base.id_uuid, uuid);
}
/* process resources */
resource_list_elem = ff_imf_xml_get_child_element_by_name(audio_sequence_elem, "ResourceList");
if (!resource_list_elem)
return 0;
resource_elem_count = xmlChildElementCount(resource_list_elem);
if (resource_elem_count > UINT32_MAX
|| vt->resource_count > UINT32_MAX - resource_elem_count)
return AVERROR(ENOMEM);
tmp = av_fast_realloc(vt->resources,
&vt->resources_alloc_sz,
(vt->resource_count + resource_elem_count)
* sizeof(FFIMFTrackFileResource));
if (!tmp) {
av_log(NULL, AV_LOG_ERROR, "Cannot allocate Main Audio Resources\n");
return AVERROR(ENOMEM);
}
vt->resources = tmp;
resource_elem = xmlFirstElementChild(resource_list_elem);
while (resource_elem) {
imf_trackfile_resource_init(&vt->resources[vt->resource_count]);
ret = fill_trackfile_resource(resource_elem,
&vt->resources[vt->resource_count],
cpl);
vt->resource_count++;
if (ret) {
av_log(NULL, AV_LOG_ERROR, "Invalid Resource\n");
continue;
}
resource_elem = xmlNextElementSibling(resource_elem);
}
return ret;
}
static int push_main_image_2d_sequence(xmlNodePtr image_sequence_elem, FFIMFCPL *cpl)
{
int ret = 0;
AVUUID uuid;
xmlNodePtr resource_list_elem = NULL;
xmlNodePtr resource_elem = NULL;
xmlNodePtr track_id_elem = NULL;
void *tmp;
unsigned long resource_elem_count;
/* 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 = ff_imf_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 = ff_imf_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(FFIMFTrackFileVirtualTrack));
if (!cpl->main_image_2d_track)
return AVERROR(ENOMEM);
imf_trackfile_virtual_track_init(cpl->main_image_2d_track);
av_uuid_copy(cpl->main_image_2d_track->base.id_uuid, uuid);
} else if (!av_uuid_equal(cpl->main_image_2d_track->base.id_uuid, uuid)) {
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 " AV_PRI_UUID "\n",
AV_UUID_ARG(uuid));
/* process resources */
resource_list_elem = ff_imf_xml_get_child_element_by_name(image_sequence_elem, "ResourceList");
if (!resource_list_elem)
return 0;
resource_elem_count = xmlChildElementCount(resource_list_elem);
if (resource_elem_count > UINT32_MAX
|| cpl->main_image_2d_track->resource_count > UINT32_MAX - resource_elem_count
|| (cpl->main_image_2d_track->resource_count + resource_elem_count)
> INT_MAX / sizeof(FFIMFTrackFileResource))
return AVERROR(ENOMEM);
tmp = av_fast_realloc(cpl->main_image_2d_track->resources,
&cpl->main_image_2d_track->resources_alloc_sz,
(cpl->main_image_2d_track->resource_count + resource_elem_count)
* sizeof(FFIMFTrackFileResource));
if (!tmp) {
av_log(NULL, AV_LOG_ERROR, "Cannot allocate Main Image Resources\n");
return AVERROR(ENOMEM);
}
cpl->main_image_2d_track->resources = tmp;
resource_elem = xmlFirstElementChild(resource_list_elem);
while (resource_elem) {
imf_trackfile_resource_init(
&cpl->main_image_2d_track->resources[cpl->main_image_2d_track->resource_count]);
ret = fill_trackfile_resource(resource_elem,
&cpl->main_image_2d_track->resources[cpl->main_image_2d_track->resource_count],
cpl);
cpl->main_image_2d_track->resource_count++;
if (ret) {
av_log(NULL, AV_LOG_ERROR, "Invalid Resource\n");
continue;
}
resource_elem = xmlNextElementSibling(resource_elem);
}
return 0;
}
static int fill_virtual_tracks(xmlNodePtr cpl_element, FFIMFCPL *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 = ff_imf_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 = ff_imf_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)
ret = push_marker_sequence(sequence_elem, cpl);
else if (xmlStrcmp(sequence_elem->name, "MainImageSequence") == 0)
ret = push_main_image_2d_sequence(sequence_elem, cpl);
else if (xmlStrcmp(sequence_elem->name, "MainAudioSequence") == 0)
ret = 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);
/* abort parsing only if memory error occurred */
if (ret == AVERROR(ENOMEM))
return ret;
sequence_elem = xmlNextElementSibling(sequence_elem);
}
segment_elem = xmlNextElementSibling(segment_elem);
}
return ret;
}
int ff_imf_parse_cpl_from_xml_dom(xmlDocPtr doc, FFIMFCPL **cpl)
{
int ret = 0;
xmlNodePtr cpl_element = NULL;
*cpl = ff_imf_cpl_alloc();
if (!*cpl) {
ret = AVERROR(ENOMEM);
goto cleanup;
}
cpl_element = xmlDocGetRootElement(doc);
if (!cpl_element || 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) {
ff_imf_cpl_free(*cpl);
*cpl = NULL;
}
return ret;
}
static void imf_marker_free(FFIMFMarker *marker)
{
if (!marker)
return;
xmlFree(marker->label_utf8);
xmlFree(marker->scope_utf8);
}
static void imf_marker_resource_free(FFIMFMarkerResource *rsrc)
{
if (!rsrc)
return;
for (uint32_t i = 0; i < rsrc->marker_count; i++)
imf_marker_free(&rsrc->markers[i]);
av_freep(&rsrc->markers);
}
static void imf_marker_virtual_track_free(FFIMFMarkerVirtualTrack *vt)
{
if (!vt)
return;
for (uint32_t i = 0; i < vt->resource_count; i++)
imf_marker_resource_free(&vt->resources[i]);
av_freep(&vt->resources);
}
static void imf_trackfile_virtual_track_free(FFIMFTrackFileVirtualTrack *vt)
{
if (!vt)
return;
av_freep(&vt->resources);
}
static void imf_cpl_init(FFIMFCPL *cpl)
{
av_uuid_nil(cpl->id_uuid);
cpl->content_title_utf8 = NULL;
cpl->edit_rate = av_make_q(0, 1);
cpl->main_markers_track = NULL;
cpl->main_image_2d_track = NULL;
cpl->main_audio_track_count = 0;
cpl->main_audio_tracks = NULL;
}
FFIMFCPL *ff_imf_cpl_alloc(void)
{
FFIMFCPL *cpl;
cpl = av_malloc(sizeof(FFIMFCPL));
if (!cpl)
return NULL;
imf_cpl_init(cpl);
return cpl;
}
void ff_imf_cpl_free(FFIMFCPL *cpl)
{
if (!cpl)
return;
xmlFree(cpl->content_title_utf8);
imf_marker_virtual_track_free(cpl->main_markers_track);
if (cpl->main_markers_track)
av_freep(&cpl->main_markers_track);
imf_trackfile_virtual_track_free(cpl->main_image_2d_track);
if (cpl->main_image_2d_track)
av_freep(&cpl->main_image_2d_track);
for (uint32_t i = 0; i < cpl->main_audio_track_count; i++)
imf_trackfile_virtual_track_free(&cpl->main_audio_tracks[i]);
if (cpl->main_audio_tracks)
av_freep(&cpl->main_audio_tracks);
av_freep(&cpl);
}
int ff_imf_parse_cpl(AVIOContext *in, FFIMFCPL **cpl)
{
AVBPrint buf;
xmlDoc *doc = NULL;
int ret = 0;
av_bprint_init(&buf, 0, INT_MAX); // xmlReadMemory uses integer length
ret = avio_read_to_bprint(in, &buf, SIZE_MAX);
if (ret < 0 || !avio_feof(in)) {
av_log(NULL, AV_LOG_ERROR, "Cannot read IMF CPL\n");
if (ret == 0)
ret = AVERROR_INVALIDDATA;
goto clean_up;
}
LIBXML_TEST_VERSION
doc = xmlReadMemory(buf.str, buf.len, NULL, NULL, 0);
if (!doc) {
av_log(NULL,
AV_LOG_ERROR,
"XML parsing failed when reading the IMF CPL\n");
ret = AVERROR_INVALIDDATA;
goto clean_up;
}
if ((ret = ff_imf_parse_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: " AV_PRI_UUID "\n",
AV_UUID_ARG((*cpl)->id_uuid));
}
xmlFreeDoc(doc);
clean_up:
av_bprint_finalize(&buf, NULL);
return ret;
}
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