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[FFmpeg-devel,v3,2/4] avformat/imf: CPL processor

Message ID 20211106220537.31826-2-pal@sandflow.com
State New
Headers show
Series [FFmpeg-devel,v3,1/4] avformat/imf: Headers
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Commit Message

Pierre-Anthony Lemieux Nov. 6, 2021, 10:05 p.m. UTC
From: Pierre-Anthony Lemieux <pal@palemieux.com>

Signed-off-by: Pierre-Anthony Lemieux <pal@palemieux.com>
---

Notes:
    Implements IMF Composition Playlist (CPL) parsing.

 libavformat/imf_cpl.c | 706 ++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 706 insertions(+)
 create mode 100644 libavformat/imf_cpl.c
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Patch

diff --git a/libavformat/imf_cpl.c b/libavformat/imf_cpl.c
new file mode 100644
index 0000000000..ad4d2c70ca
--- /dev/null
+++ b/libavformat/imf_cpl.c
@@ -0,0 +1,706 @@ 
+/*
+ * 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 "libavformat/mxf.h"
+#include "libavutil/bprint.h"
+#include "libavutil/error.h"
+#include <libxml/parser.h>
+
+xmlNodePtr 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 imf_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,
+        IMF_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 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 imf_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 = 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, IMFCPL *cpl)
+{
+    xmlNodePtr element = NULL;
+
+    if (!(element = 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 imf_xml_read_rational(element, &cpl->edit_rate);
+}
+
+static int fill_id(xmlNodePtr cpl_element, IMFCPL *cpl)
+{
+    xmlNodePtr element = NULL;
+
+    if (!(element = 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 imf_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 = 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 = imf_xml_read_ulong(element, &marker->offset)))
+        return ret;
+
+    /* read Label and Scope */
+    if (!(element = 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");
+    }
+
+    return ret;
+}
+
+static int fill_base_resource(xmlNodePtr resource_elem, IMFBaseResource *resource, IMFCPL *cpl)
+{
+    xmlNodePtr element = NULL;
+    int ret = 0;
+
+    /* read EditRate */
+    if (!(element = imf_xml_get_child_element_by_name(resource_elem, "EditRate"))) {
+        resource->edit_rate = cpl->edit_rate;
+    } else if (ret = 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 = imf_xml_get_child_element_by_name(resource_elem, "EntryPoint")) {
+        if (ret = imf_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 = 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 = imf_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 = imf_xml_get_child_element_by_name(resource_elem, "SourceDuration")) {
+        if (ret = imf_xml_read_ulong(element, &resource->duration)) {
+            av_log(NULL, AV_LOG_ERROR, "SourceDuration element missing from Resource\n");
+            return ret;
+        }
+    }
+
+    /* read RepeatCount */
+    if (element = imf_xml_get_child_element_by_name(resource_elem, "RepeatCount")) {
+        ret = imf_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 = imf_xml_get_child_element_by_name(tf_resource_elem, "TrackFileId")) {
+        if (ret = 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, 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");
+                return AVERROR(ENOMEM);
+            }
+            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 = 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 (ret = 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 " IMF_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");
+            return AVERROR(ENOMEM);
+        }
+        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 = imf_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");
+            return AVERROR(ENOMEM);
+        }
+        imf_marker_resource_init(&cpl->main_markers_track->resources[cpl->main_markers_track->resource_count - 1]);
+        if (ret = fill_marker_resource(resource_elem, &cpl->main_markers_track->resources[cpl->main_markers_track->resource_count - 1], cpl))
+            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, 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 = 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 = 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 " IMF_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");
+            return AVERROR(ENOMEM);
+        }
+        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 = imf_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");
+            return AVERROR(ENOMEM);
+        }
+        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 = 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 = 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(IMFTrackFileVirtualTrack));
+        if (!cpl->main_image_2d_track) {
+            av_log(NULL, AV_LOG_PANIC, "Cannot allocate MainImage virtual track\n");
+            return AVERROR(ENOMEM);
+        }
+        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 " IMF_UUID_FORMAT "\n", UID_ARG(uuid));
+
+    /* process resources */
+    if (!(resource_list_elem = imf_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");
+            return AVERROR(ENOMEM);
+        }
+        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 = 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 = 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);
+            if (ret == AVERROR(ENOMEM))
+                /* abort parsing only if memory error occurred */
+                return ret;
+            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(ENOMEM);
+        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);
+        if (cpl->main_markers_track)
+            av_free(cpl->main_markers_track);
+        imf_trackfile_virtual_track_free(cpl->main_image_2d_track);
+        if (cpl->main_image_2d_track)
+            av_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]);
+        if (cpl->main_audio_tracks)
+            av_free(cpl->main_audio_tracks);
+    }
+    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: " IMF_UUID_FORMAT "\n", UID_ARG((*cpl)->id_uuid));
+        }
+        xmlFreeDoc(doc);
+        xmlCleanupParser();
+    }
+
+    return ret;
+}