[FFmpeg-devel] [PATCH 2/5] [IMF demuxer] CPL processor
pal at sandflow.com
pal at sandflow.com
Thu Sep 23 22:29:28 EEST 2021
From: Pierre-Anthony Lemieux <pal at palemieux.com>
Signed-off-by: Pierre-Anthony Lemieux <pal at palemieux.com>
---
Notes:
Implements IMF Composition Playlist (CPL) parsing. The IMF CPL is specified in SMTPE ST 2067-3 and defines a timeline onto which MXF files are placed.
libavformat/imf_cpl.c | 652 ++++++++++++++++++++++++++++++++++++++++++
1 file changed, 652 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..e0c8e2c58f
--- /dev/null
+++ b/libavformat/imf_cpl.c
@@ -0,0 +1,652 @@
+/*
+ * This file is part of FFmpeg.
+ *
+ * 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 "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);
+ }
+ 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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