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[FFmpeg-devel,v3,3/4] avformat/imf: Demuxer implementation

Message ID 20211106220537.31826-3-pal@sandflow.com
State New
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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 the IMF demuxer.

 libavformat/imfdec.c | 773 +++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 773 insertions(+)
 create mode 100644 libavformat/imfdec.c

Comments

Paul B Mahol Nov. 22, 2021, 11:19 a.m. UTC | #1
The realloc calls still leaks on error.
Pierre-Anthony Lemieux Nov. 22, 2021, 4:34 p.m. UTC | #2
Hi Paul,

Thanks for the review.

Are you saying that, in the event that any memory allocation fails
within the demuxer, the demuxer is responsible for cleaning-up already
previously allocated memory so that other parts of the pipeline can
continue operating? In other words, ffmpeg is not expected to
immediately die if memory allocation fails in one
demuxer/decoder/muxer?

I just want to make sure I understand the feedback.

Best,

-- Pierre

On Mon, Nov 22, 2021 at 3:19 AM Paul B Mahol <onemda@gmail.com> wrote:
>
>
> The realloc calls still leaks on error.
Paul B Mahol Nov. 22, 2021, 8:37 p.m. UTC | #3
On Mon, Nov 22, 2021 at 5:35 PM Pierre-Anthony Lemieux <pal@sandflow.com>
wrote:

> Hi Paul,
>
> Thanks for the review.
>
> Are you saying that, in the event that any memory allocation fails
> within the demuxer, the demuxer is responsible for cleaning-up already
> previously allocated memory so that other parts of the pipeline can
> continue operating? In other words, ffmpeg is not expected to
> immediately die if memory allocation fails in one
> demuxer/decoder/muxer?
>


I'm saying it leaks memory because it overwrites old pointer with NULL.


>
> I just want to make sure I understand the feedback.
>
> Best,
>
> -- Pierre
>
> On Mon, Nov 22, 2021 at 3:19 AM Paul B Mahol <onemda@gmail.com> wrote:
> >
> >
> > The realloc calls still leaks on error.
>
Pierre-Anthony Lemieux Nov. 22, 2021, 9:02 p.m. UTC | #4
On Mon, Nov 22, 2021 at 12:37 PM Paul B Mahol <onemda@gmail.com> wrote:
>
>
>
> On Mon, Nov 22, 2021 at 5:35 PM Pierre-Anthony Lemieux <pal@sandflow.com> wrote:
>>
>> Hi Paul,
>>
>> Thanks for the review.
>>
>> Are you saying that, in the event that any memory allocation fails
>> within the demuxer, the demuxer is responsible for cleaning-up already
>> previously allocated memory so that other parts of the pipeline can
>> continue operating? In other words, ffmpeg is not expected to
>> immediately die if memory allocation fails in one
>> demuxer/decoder/muxer?
>
>
>
> I'm saying it leaks memory because it overwrites old pointer with NULL.
>

Got it. Will fix now.

>>
>>
>> I just want to make sure I understand the feedback.
>>
>> Best,
>>
>> -- Pierre
>>
>> On Mon, Nov 22, 2021 at 3:19 AM Paul B Mahol <onemda@gmail.com> wrote:
>> >
>> >
>> > The realloc calls still leaks on error.
diff mbox series

Patch

diff --git a/libavformat/imfdec.c b/libavformat/imfdec.c
new file mode 100644
index 0000000000..24cdd1ac3f
--- /dev/null
+++ b/libavformat/imfdec.c
@@ -0,0 +1,773 @@ 
+/*
+ * Copyright (c) Sandflow Consulting LLC
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * * Redistributions of source code must retain the above copyright notice, this
+ *   list of conditions and the following disclaimer.
+ * * Redistributions in binary form must reproduce the above copyright notice,
+ *   this list of conditions and the following disclaimer in the documentation
+ *   and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * FFmpeg is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+/**
+ * Demuxes an IMF Composition
+ *
+ * References
+ * OV 2067-0:2018 - SMPTE Overview Document - Interoperable Master Format
+ * ST 2067-2:2020 - SMPTE Standard - Interoperable Master Format — Core Constraints
+ * ST 2067-3:2020 - SMPTE Standard - Interoperable Master Format — Composition Playlist
+ * ST 2067-5:2020 - SMPTE Standard - Interoperable Master Format — Essence Component
+ * ST 2067-20:2016 - SMPTE Standard - Interoperable Master Format — Application #2
+ * ST 2067-21:2020 - SMPTE Standard - Interoperable Master Format — Application #2 Extended
+ * ST 2067-102:2017 - SMPTE Standard - Interoperable Master Format — Common Image Pixel Color Schemes
+ * ST 429-9:2007 - SMPTE Standard - D-Cinema Packaging — Asset Mapping and File Segmentation
+ *
+ * @author Marc-Antoine Arnaud
+ * @author Valentin Noel
+ * @author Nicholas Vanderzwet
+ * @file
+ * @ingroup lavu_imf
+ */
+
+#include "imf.h"
+#include "internal.h"
+#include "libavutil/avstring.h"
+#include "libavutil/bprint.h"
+#include "libavutil/opt.h"
+#include "mxf.h"
+#include "url.h"
+#include <inttypes.h>
+#include <libxml/parser.h>
+
+#define MAX_BPRINT_READ_SIZE (UINT_MAX - 1)
+#define DEFAULT_ASSETMAP_SIZE 8 * 1024
+#define IMF_AVRATIONAL_FORMAT "%d/%d"
+#define IMF_AVRATIONAL_ARG(rational) rational.num, rational.den
+
+/**
+ * IMF Asset locator
+ */
+typedef struct IMFAssetLocator {
+    UUID uuid;
+    char *absolute_uri;
+} IMFAssetLocator;
+
+/**
+ * IMF Asset locator map
+ * Results from the parsing of one or more ASSETMAP XML files
+ */
+typedef struct IMFAssetLocatorMap {
+    uint8_t asset_count;
+    IMFAssetLocator **assets;
+} IMFAssetLocatorMap;
+
+typedef struct IMFVirtualTrackResourcePlaybackCtx {
+    IMFAssetLocator *locator;
+    IMFTrackFileResource *resource;
+    AVFormatContext *ctx;
+} IMFVirtualTrackResourcePlaybackCtx;
+
+typedef struct IMFVirtualTrackPlaybackCtx {
+    // Track index in playlist
+    int32_t index;
+    // Time counters
+    AVRational current_timestamp;
+    AVRational duration;
+    // Resources
+    unsigned int resource_count;
+    IMFVirtualTrackResourcePlaybackCtx **resources;
+    // Decoding cursors
+    uint32_t current_resource_index;
+    int64_t last_pts;
+} IMFVirtualTrackPlaybackCtx;
+
+typedef struct IMFContext {
+    const AVClass *class;
+    const char *base_url;
+    char *asset_map_paths;
+    AVIOInterruptCB *interrupt_callback;
+    AVDictionary *avio_opts;
+    IMFCPL *cpl;
+    IMFAssetLocatorMap *asset_locator_map;
+    unsigned int track_count;
+    IMFVirtualTrackPlaybackCtx **tracks;
+} IMFContext;
+
+static int imf_uri_is_url(const char *string)
+{
+    char *substr = strstr(string, "://");
+    return substr != NULL;
+}
+
+static int imf_uri_is_unix_abs_path(const char *string)
+{
+    char *substr = strstr(string, "/");
+    int index = (int)(substr - string);
+    return index == 0;
+}
+
+static int imf_uri_is_dos_abs_path(const char *string)
+{
+    // Absolute path case: `C:\path\to\somwhere`
+    char *substr = strstr(string, ":\\");
+    int index = (int)(substr - string);
+    if (index == 1)
+        return 1;
+
+    // Absolute path case: `C:/path/to/somwhere`
+    substr = strstr(string, ":/");
+    index = (int)(substr - string);
+    if (index == 1)
+        return 1;
+
+    // Network path case: `\\path\to\somwhere`
+    substr = strstr(string, "\\\\");
+    index = (int)(substr - string);
+    return index == 0;
+}
+
+/**
+ * Parse a ASSETMAP XML file to extract the UUID-URI mapping of assets.
+ * @param s the current format context, if any (can be NULL).
+ * @param doc the XML document to be parsed.
+ * @param asset_map pointer on the IMFAssetLocatorMap pointer to fill.
+ * @param base_url the url of the asset map XML file, if any (can be NULL).
+ * @return a negative value in case of error, 0 otherwise.
+ */
+static int parse_imf_asset_map_from_xml_dom(AVFormatContext *s, xmlDocPtr doc, IMFAssetLocatorMap **asset_map, const char *base_url)
+{
+    xmlNodePtr asset_map_element = NULL;
+    xmlNodePtr node = NULL;
+    char *uri;
+    int ret = 0;
+
+    IMFAssetLocator *asset = NULL;
+
+    asset_map_element = xmlDocGetRootElement(doc);
+
+    if (!asset_map_element) {
+        av_log(s, AV_LOG_ERROR, "Unable to parse asset map XML - missing root node\n");
+        return AVERROR_INVALIDDATA;
+    }
+
+    if (asset_map_element->type != XML_ELEMENT_NODE || av_strcasecmp(asset_map_element->name, "AssetMap")) {
+        av_log(s, AV_LOG_ERROR, "Unable to parse asset map XML - wrong root node name[%s] type[%d]\n", asset_map_element->name, (int)asset_map_element->type);
+        return AVERROR_INVALIDDATA;
+    }
+
+    // parse asset locators
+
+    if (!(node = imf_xml_get_child_element_by_name(asset_map_element, "AssetList"))) {
+        av_log(s, AV_LOG_ERROR, "Unable to parse asset map XML - missing AssetList node\n");
+        return AVERROR_INVALIDDATA;
+    }
+
+    node = xmlFirstElementChild(node);
+    while (node) {
+        if (av_strcasecmp(node->name, "Asset") != 0) {
+            continue;
+        }
+
+        asset = av_malloc(sizeof(IMFAssetLocator));
+        if (!asset)
+            return AVERROR(ENOMEM);
+
+        if (imf_xml_read_UUID(imf_xml_get_child_element_by_name(node, "Id"), asset->uuid)) {
+            av_log(s, AV_LOG_ERROR, "Could not parse UUID from asset in asset map.\n");
+            av_freep(&asset);
+            return 1;
+        }
+
+        av_log(s, AV_LOG_DEBUG, "Found asset id: " IMF_UUID_FORMAT "\n", UID_ARG(asset->uuid));
+
+        if (!(node = imf_xml_get_child_element_by_name(node, "ChunkList"))) {
+            av_log(s, AV_LOG_ERROR, "Unable to parse asset map XML - missing ChunkList node\n");
+            return AVERROR_INVALIDDATA;
+        }
+
+        if (!(node = imf_xml_get_child_element_by_name(node, "Chunk"))) {
+            av_log(s, AV_LOG_ERROR, "Unable to parse asset map XML - missing Chunk node\n");
+            return AVERROR_INVALIDDATA;
+        }
+
+        uri = xmlNodeGetContent(imf_xml_get_child_element_by_name(node, "Path"));
+        if (!imf_uri_is_url(uri) && !imf_uri_is_unix_abs_path(uri) && !imf_uri_is_dos_abs_path(uri))
+            asset->absolute_uri = av_append_path_component(base_url, uri);
+        else
+            asset->absolute_uri = av_strdup(uri);
+        xmlFree(uri);
+        if (!asset->absolute_uri) {
+            av_log(NULL, AV_LOG_PANIC, "Cannot allocate asset locator absolute URI\n");
+            return AVERROR(ENOMEM);
+        }
+
+        av_log(s, AV_LOG_DEBUG, "Found asset absolute URI: %s\n", asset->absolute_uri);
+
+        node = xmlNextElementSibling(node->parent->parent);
+
+        (*asset_map)->assets = av_realloc((*asset_map)->assets, ((*asset_map)->asset_count + 1) * sizeof(IMFAssetLocator));
+        if (!(*asset_map)->assets) {
+            av_log(NULL, AV_LOG_PANIC, "Cannot allocate IMF asset locators\n");
+            return AVERROR(ENOMEM);
+        }
+        (*asset_map)->assets[(*asset_map)->asset_count++] = asset;
+    }
+
+    return ret;
+}
+
+/**
+ * Allocate a IMFAssetLocatorMap pointer and return it.
+ * @return the allocated IMFAssetLocatorMap pointer.
+ */
+static IMFAssetLocatorMap *imf_asset_locator_map_alloc(void)
+{
+    IMFAssetLocatorMap *asset_map;
+
+    asset_map = av_malloc(sizeof(IMFAssetLocatorMap));
+    if (!asset_map)
+        return NULL;
+
+    asset_map->assets = NULL;
+    asset_map->asset_count = 0;
+    return asset_map;
+}
+
+/**
+ * Free a IMFAssetLocatorMap pointer.
+ */
+static void imf_asset_locator_map_free(IMFAssetLocatorMap *asset_map)
+{
+    if (asset_map == NULL) {
+        return;
+    }
+
+    for (int i = 0; i < asset_map->asset_count; ++i) {
+        av_free(asset_map->assets[i]->absolute_uri);
+        av_free(asset_map->assets[i]);
+    }
+
+    av_freep(&asset_map->assets);
+    av_freep(&asset_map);
+}
+
+static int parse_assetmap(AVFormatContext *s, const char *url, AVIOContext *in)
+{
+    IMFContext *c = s->priv_data;
+    struct AVBPrint buf;
+    AVDictionary *opts = NULL;
+    xmlDoc *doc = NULL;
+    const char *base_url;
+
+    int close_in = 0;
+    int ret;
+    int64_t filesize;
+
+    base_url = av_dirname(strdup(url));
+    if (c->asset_locator_map == NULL) {
+        c->asset_locator_map = imf_asset_locator_map_alloc();
+        if (!c->asset_locator_map) {
+            av_log(s, AV_LOG_PANIC, "Unable to allocate asset map locator\n");
+            return AVERROR(ENOMEM);
+        }
+    }
+
+    av_log(s, AV_LOG_DEBUG, "Asset Map URL: %s\n", url);
+
+    if (!in) {
+        close_in = 1;
+
+        av_dict_copy(&opts, c->avio_opts, 0);
+        ret = s->io_open(s, &in, url, AVIO_FLAG_READ, &opts);
+        av_dict_free(&opts);
+        if (ret < 0)
+            return ret;
+    }
+
+    filesize = avio_size(in);
+    filesize = filesize > 0 ? filesize : DEFAULT_ASSETMAP_SIZE;
+
+    av_bprint_init(&buf, filesize + 1, AV_BPRINT_SIZE_UNLIMITED);
+
+    if ((ret = avio_read_to_bprint(in, &buf, MAX_BPRINT_READ_SIZE)) < 0 || !avio_feof(in) || (filesize = buf.len) == 0) {
+        av_log(s, AV_LOG_ERROR, "Unable to read to asset map '%s'\n", url);
+        if (ret == 0)
+            ret = AVERROR_INVALIDDATA;
+    } else {
+        LIBXML_TEST_VERSION
+
+        doc = xmlReadMemory(buf.str, filesize, url, NULL, 0);
+
+        ret = parse_imf_asset_map_from_xml_dom(s, doc, &c->asset_locator_map, base_url);
+        if (ret != 0) {
+            goto cleanup;
+        }
+
+        av_log(s, AV_LOG_DEBUG, "Found %d assets from %s\n", c->asset_locator_map->asset_count, url);
+
+    cleanup:
+        xmlFreeDoc(doc);
+    }
+    if (close_in) {
+        avio_close(in);
+    }
+    return ret;
+}
+
+static IMFAssetLocator *find_asset_map_locator(IMFAssetLocatorMap *asset_map, UUID uuid)
+{
+    IMFAssetLocator *asset_locator;
+    for (int i = 0; i < asset_map->asset_count; ++i) {
+        asset_locator = asset_map->assets[i];
+        if (memcmp(asset_map->assets[i]->uuid, uuid, 16) == 0) {
+            return asset_locator;
+        }
+    }
+    return NULL;
+}
+
+static int open_track_resource_context(AVFormatContext *s, IMFVirtualTrackResourcePlaybackCtx *track_resource)
+{
+    IMFContext *c = s->priv_data;
+    int ret = 0;
+    int64_t entry_point;
+    AVDictionary *opts = NULL;
+
+    if (!track_resource->ctx) {
+        track_resource->ctx = avformat_alloc_context();
+        if (!track_resource->ctx) {
+            av_log(NULL, AV_LOG_PANIC, "Cannot allocate Track Resource Context\n");
+            return AVERROR(ENOMEM);
+        }
+    }
+
+    if (track_resource->ctx->iformat) {
+        av_log(s, AV_LOG_DEBUG, "Input context already opened for %s.\n", track_resource->locator->absolute_uri);
+        return ret;
+    }
+
+    track_resource->ctx->io_open = s->io_open;
+    track_resource->ctx->io_close = s->io_close;
+    track_resource->ctx->flags |= s->flags & ~AVFMT_FLAG_CUSTOM_IO;
+
+    if ((ret = ff_copy_whiteblacklists(track_resource->ctx, s)) < 0) {
+        goto cleanup;
+    }
+
+    av_dict_copy(&opts, c->avio_opts, 0);
+    ret = avformat_open_input(&track_resource->ctx, track_resource->locator->absolute_uri, NULL, &opts);
+    av_dict_free(&opts);
+    if (ret < 0) {
+        av_log(s, AV_LOG_ERROR, "Could not open %s input context: %s\n", track_resource->locator->absolute_uri, av_err2str(ret));
+        goto cleanup;
+    }
+
+    ret = avformat_find_stream_info(track_resource->ctx, NULL);
+    if (ret < 0) {
+        av_log(s, AV_LOG_ERROR, "Could not find %s stream information: %s\n", track_resource->locator->absolute_uri, av_err2str(ret));
+        goto cleanup;
+    }
+
+    // Compare the source timebase to the resource edit rate, considering the first stream of the source file
+    if (av_cmp_q(track_resource->ctx->streams[0]->time_base, av_inv_q(track_resource->resource->base.edit_rate))) {
+        av_log(s, AV_LOG_WARNING, "Incoherent source stream timebase %d/%d regarding resource edit rate: %d/%d", track_resource->ctx->streams[0]->time_base.num, track_resource->ctx->streams[0]->time_base.den, track_resource->resource->base.edit_rate.den, track_resource->resource->base.edit_rate.num);
+    }
+
+    entry_point = (int64_t)track_resource->resource->base.entry_point * track_resource->resource->base.edit_rate.den * AV_TIME_BASE / track_resource->resource->base.edit_rate.num;
+
+    if (entry_point) {
+        av_log(s, AV_LOG_DEBUG, "Seek at resource %s entry point: %ld\n", track_resource->locator->absolute_uri, track_resource->resource->base.entry_point);
+        ret = avformat_seek_file(track_resource->ctx, -1, entry_point, entry_point, entry_point, 0);
+        if (ret < 0) {
+            av_log(s, AV_LOG_ERROR, "Could not seek at %" PRId64 "on %s: %s\n", entry_point, track_resource->locator->absolute_uri, av_err2str(ret));
+            goto cleanup;
+        }
+    }
+
+    return ret;
+cleanup:
+    avformat_free_context(track_resource->ctx);
+    return ret;
+}
+
+static int open_track_file_resource(AVFormatContext *s, IMFTrackFileResource *track_file_resource, IMFVirtualTrackPlaybackCtx *track)
+{
+    IMFContext *c = s->priv_data;
+    IMFVirtualTrackResourcePlaybackCtx *track_resource;
+    IMFAssetLocator *asset_locator;
+
+    int ret;
+
+    if (!(asset_locator = find_asset_map_locator(c->asset_locator_map, track_file_resource->track_file_uuid))) {
+        av_log(s, AV_LOG_ERROR, "Could not find asset locator for UUID: " IMF_UUID_FORMAT "\n", UID_ARG(track_file_resource->track_file_uuid));
+        return AVERROR_INVALIDDATA;
+    }
+
+    av_log(s, AV_LOG_DEBUG, "Found locator for " IMF_UUID_FORMAT ": %s\n", UID_ARG(asset_locator->uuid), asset_locator->absolute_uri);
+
+    track_resource = av_mallocz(sizeof(IMFVirtualTrackResourcePlaybackCtx));
+    track_resource->locator = asset_locator;
+    track_resource->resource = track_file_resource;
+
+    if ((ret = open_track_resource_context(s, track_resource)) != 0) {
+        return ret;
+    }
+
+    for (int repetition = 0; repetition < track_file_resource->base.repeat_count; ++repetition) {
+        track->resources = av_realloc(track->resources, (track->resource_count + 1) * sizeof(IMFVirtualTrackResourcePlaybackCtx));
+        if (!track->resources) {
+            av_log(NULL, AV_LOG_PANIC, "Cannot allocate Virtual Track playback context\n");
+            return AVERROR(ENOMEM);
+        }
+        track->resources[track->resource_count++] = track_resource;
+        track->duration = av_add_q(track->duration, av_make_q((int)track_resource->resource->base.duration * track_resource->resource->base.edit_rate.den, track_resource->resource->base.edit_rate.num));
+    }
+
+    return ret;
+}
+
+static int open_virtual_track(AVFormatContext *s, IMFTrackFileVirtualTrack *virtual_track, int32_t track_index)
+{
+    IMFContext *c = s->priv_data;
+    IMFVirtualTrackPlaybackCtx *track;
+    int ret = 0;
+
+    track = av_mallocz(sizeof(IMFVirtualTrackPlaybackCtx));
+    if (!track) {
+        av_log(NULL, AV_LOG_PANIC, "Cannot allocate IMF Virtual Track Playback context\n");
+        return AVERROR(ENOMEM);
+    }
+    track->index = track_index;
+    track->duration = av_make_q(0, INT32_MAX);
+
+    for (int i = 0; i < virtual_track->resource_count; i++) {
+        av_log(s, AV_LOG_DEBUG, "Open stream from file " IMF_UUID_FORMAT ", stream %d\n", UID_ARG(virtual_track->resources[i].track_file_uuid), i);
+        if ((ret = open_track_file_resource(s, &virtual_track->resources[i], track)) != 0) {
+            av_log(s, AV_LOG_ERROR, "Could not open image track resource " IMF_UUID_FORMAT "\n", UID_ARG(virtual_track->resources[i].track_file_uuid));
+            return ret;
+        }
+    }
+
+    track->current_timestamp = av_make_q(0, track->duration.den);
+
+    c->tracks = av_realloc(c->tracks, (c->track_count + 1) * sizeof(IMFVirtualTrackPlaybackCtx));
+    if (!c->tracks) {
+        av_log(NULL, AV_LOG_PANIC, "Cannot allocate Virtual Track playback context\n");
+        return AVERROR(ENOMEM);
+    }
+    c->tracks[c->track_count++] = track;
+
+    return ret;
+}
+
+static void imf_virtual_track_playback_context_free(IMFVirtualTrackPlaybackCtx *track)
+{
+    if (!track) {
+        return;
+    }
+
+    for (int i = 0; i < track->resource_count; ++i) {
+        if (!track->resources[i]) {
+            continue;
+        }
+
+        if (track->resources[i]->ctx && track->resources[i]->ctx->iformat) {
+            avformat_free_context(track->resources[i]->ctx);
+            track->resources[i]->ctx = NULL;
+        }
+    }
+}
+
+static int set_context_streams_from_tracks(AVFormatContext *s)
+{
+    IMFContext *c = s->priv_data;
+
+    AVStream *asset_stream;
+    AVStream *first_resource_stream;
+
+    int ret = 0;
+
+    for (int i = 0; i < c->track_count; ++i) {
+        // Open the first resource of the track to get stream information
+        first_resource_stream = c->tracks[i]->resources[0]->ctx->streams[0];
+
+        av_log(s, AV_LOG_DEBUG, "Open the first resource of track %d\n", c->tracks[i]->index);
+
+        // Copy stream information
+        asset_stream = avformat_new_stream(s, NULL);
+        asset_stream->id = i;
+        if ((ret = avcodec_parameters_copy(asset_stream->codecpar, first_resource_stream->codecpar)) < 0) {
+            av_log(s, AV_LOG_ERROR, "Could not copy stream parameters\n");
+            break;
+        }
+        avpriv_set_pts_info(asset_stream, first_resource_stream->pts_wrap_bits, first_resource_stream->time_base.num, first_resource_stream->time_base.den);
+        asset_stream->duration = (int64_t)av_q2d(av_mul_q(c->tracks[i]->duration, av_inv_q(asset_stream->time_base)));
+    }
+
+    return ret;
+}
+
+static int save_avio_options(AVFormatContext *s)
+{
+    IMFContext *c = s->priv_data;
+    static const char * const opts[] = {
+        "headers", "http_proxy", "user_agent", "cookies", "referer", "rw_timeout", "icy", NULL };
+    const char * const * opt = opts;
+    uint8_t *buf;
+    int ret = 0;
+
+    while (*opt) {
+        if (av_opt_get(s->pb, *opt, AV_OPT_SEARCH_CHILDREN | AV_OPT_ALLOW_NULL, &buf) >= 0) {
+            ret = av_dict_set(&c->avio_opts, *opt, buf,
+                              AV_DICT_DONT_STRDUP_VAL);
+            if (ret < 0)
+                return ret;
+        }
+        opt++;
+    }
+
+    return ret;
+}
+
+static int open_cpl_tracks(AVFormatContext *s)
+{
+    IMFContext *c = s->priv_data;
+    int32_t track_index = 0;
+    int ret;
+
+    if (c->cpl->main_image_2d_track) {
+        if ((ret = open_virtual_track(s, c->cpl->main_image_2d_track, track_index++)) != 0) {
+            av_log(s, AV_LOG_ERROR, "Could not open image track " IMF_UUID_FORMAT "\n", UID_ARG(c->cpl->main_image_2d_track->base.id_uuid));
+            return ret;
+        }
+    }
+
+    for (int audio_track_index = 0; audio_track_index < c->cpl->main_audio_track_count; ++audio_track_index) {
+        if ((ret = open_virtual_track(s, &c->cpl->main_audio_tracks[audio_track_index], track_index++)) != 0) {
+            av_log(s, AV_LOG_ERROR, "Could not open audio track " IMF_UUID_FORMAT "\n", UID_ARG(c->cpl->main_audio_tracks[audio_track_index].base.id_uuid));
+            return ret;
+        }
+    }
+
+    return set_context_streams_from_tracks(s);
+}
+
+static int imf_close(AVFormatContext *s);
+
+static int imf_read_header(AVFormatContext *s)
+{
+    IMFContext *c = s->priv_data;
+    char *asset_map_path;
+    int ret;
+
+    c->interrupt_callback = &s->interrupt_callback;
+    c->base_url = av_dirname(av_strdup(s->url));
+    if ((ret = save_avio_options(s)) < 0)
+        goto fail;
+
+    av_log(s, AV_LOG_DEBUG, "start parsing IMF CPL: %s\n", s->url);
+
+    if ((ret = parse_imf_cpl(s->pb, &c->cpl)) < 0)
+        goto fail;
+
+    av_log(s, AV_LOG_DEBUG, "parsed IMF CPL: " IMF_UUID_FORMAT "\n", UID_ARG(c->cpl->id_uuid));
+
+    if (!c->asset_map_paths) {
+        c->asset_map_paths = av_append_path_component(c->base_url, "ASSETMAP.xml");
+    }
+
+    // Parse each asset map XML file
+    asset_map_path = strtok(c->asset_map_paths, ",");
+    while (asset_map_path != NULL) {
+        av_log(s, AV_LOG_DEBUG, "start parsing IMF Asset Map: %s\n", asset_map_path);
+
+        if ((ret = parse_assetmap(s, asset_map_path, NULL)) < 0)
+            goto fail;
+
+        asset_map_path = strtok(NULL, ",");
+    }
+
+    av_log(s, AV_LOG_DEBUG, "parsed IMF Asset Maps\n");
+
+    if ((ret = open_cpl_tracks(s)) != 0) {
+        goto fail;
+    }
+
+    av_log(s, AV_LOG_DEBUG, "parsed IMF package\n");
+    return ret;
+
+fail:
+    imf_close(s);
+    return ret;
+}
+
+static IMFVirtualTrackPlaybackCtx *get_next_track_with_minimum_timestamp(AVFormatContext *s)
+{
+    IMFContext *c = s->priv_data;
+    IMFVirtualTrackPlaybackCtx *track;
+
+    AVRational minimum_timestamp = av_make_q(INT32_MAX, 1);
+    for (int i = 0; i < c->track_count; ++i) {
+        av_log(s, AV_LOG_DEBUG, "Compare track %d timestamp " IMF_AVRATIONAL_FORMAT " to minimum " IMF_AVRATIONAL_FORMAT " (over duration: " IMF_AVRATIONAL_FORMAT ")\n", i, IMF_AVRATIONAL_ARG(c->tracks[i]->current_timestamp), IMF_AVRATIONAL_ARG(minimum_timestamp), IMF_AVRATIONAL_ARG(c->tracks[i]->duration));
+        if (av_cmp_q(c->tracks[i]->current_timestamp, minimum_timestamp) < 0) {
+            track = c->tracks[i];
+            minimum_timestamp = track->current_timestamp;
+        }
+    }
+
+    av_log(s, AV_LOG_DEBUG, "Found next track to read: %d (timestamp: %lf / %lf)\n", track->index, av_q2d(track->current_timestamp), av_q2d(minimum_timestamp));
+    return track;
+}
+
+static IMFVirtualTrackResourcePlaybackCtx *get_resource_context_for_timestamp(AVFormatContext *s, IMFVirtualTrackPlaybackCtx *track)
+{
+    AVRational edit_unit_duration = av_inv_q(track->resources[0]->resource->base.edit_rate);
+    AVRational cumulated_duration = av_make_q(0, edit_unit_duration.den);
+
+    av_log(s, AV_LOG_DEBUG, "Looking for track %d resource for timestamp = %lf / %lf\n", track->index, av_q2d(track->current_timestamp), av_q2d(track->duration));
+    for (int i = 0; i < track->resource_count; ++i) {
+        cumulated_duration = av_add_q(cumulated_duration, av_make_q((int)track->resources[i]->resource->base.duration * edit_unit_duration.num, edit_unit_duration.den));
+
+        if (av_cmp_q(av_add_q(track->current_timestamp, edit_unit_duration), cumulated_duration) <= 0) {
+            av_log(s, AV_LOG_DEBUG, "Found resource %d in track %d to read for timestamp %lf (on cumulated=%lf): entry=%ld, duration=%lu, editrate=" IMF_AVRATIONAL_FORMAT " | edit_unit_duration=%lf\n", i, track->index, av_q2d(track->current_timestamp), av_q2d(cumulated_duration), track->resources[i]->resource->base.entry_point, track->resources[i]->resource->base.duration, IMF_AVRATIONAL_ARG(track->resources[i]->resource->base.edit_rate), av_q2d(edit_unit_duration));
+
+            if (track->current_resource_index != i) {
+                av_log(s, AV_LOG_DEBUG, "Switch resource on track %d: re-open context\n", track->index);
+                if (track->resources[track->current_resource_index] != NULL) {
+                    avformat_close_input(&track->resources[track->current_resource_index]->ctx);
+                }
+                if (open_track_resource_context(s, track->resources[i]) != 0) {
+                    return NULL;
+                }
+                track->current_resource_index = i;
+            }
+            return track->resources[track->current_resource_index];
+        }
+    }
+    return NULL;
+}
+
+static int ff_imf_read_packet(AVFormatContext *s, AVPacket *pkt)
+{
+    IMFContext *c = s->priv_data;
+
+    IMFVirtualTrackResourcePlaybackCtx *resource_to_read = NULL;
+    AVRational edit_unit_duration;
+    int ret = 0;
+
+    IMFVirtualTrackPlaybackCtx *track_to_read = get_next_track_with_minimum_timestamp(s);
+    FFStream *track_to_read_stream_internal;
+
+    if (av_cmp_q(track_to_read->current_timestamp, track_to_read->duration) == 0) {
+        return AVERROR_EOF;
+    }
+
+    resource_to_read = get_resource_context_for_timestamp(s, track_to_read);
+
+    if (!resource_to_read) {
+        edit_unit_duration = av_inv_q(track_to_read->resources[track_to_read->current_resource_index]->resource->base.edit_rate);
+        if (av_cmp_q(av_add_q(track_to_read->current_timestamp, edit_unit_duration), track_to_read->duration) > 0) {
+            return AVERROR_EOF;
+        }
+
+        av_log(s, AV_LOG_ERROR, "Could not find IMF track resource to read\n");
+        return AVERROR_STREAM_NOT_FOUND;
+    }
+
+    while (!ff_check_interrupt(c->interrupt_callback) && !ret) {
+        ret = av_read_frame(resource_to_read->ctx, pkt);
+        av_log(s, AV_LOG_DEBUG, "Got packet: pts=%" PRId64 ", dts=%" PRId64 ", duration=%" PRId64 ", stream_index=%d, pos=%" PRId64 "\n", pkt->pts, pkt->dts, pkt->duration, pkt->stream_index, pkt->pos);
+        track_to_read_stream_internal = ffstream(s->streams[track_to_read->index]);
+        if (ret >= 0) {
+            // Update packet info from track
+            if (pkt->dts < track_to_read_stream_internal->cur_dts && track_to_read->last_pts > 0) {
+                pkt->dts = track_to_read_stream_internal->cur_dts;
+            }
+
+            pkt->pts = track_to_read->last_pts;
+            pkt->dts = pkt->dts - (int64_t)track_to_read->resources[track_to_read->current_resource_index]->resource->base.entry_point;
+            pkt->stream_index = track_to_read->index;
+
+            // Update track cursors
+            track_to_read->current_timestamp = av_add_q(track_to_read->current_timestamp, av_make_q((int)pkt->duration * resource_to_read->ctx->streams[0]->time_base.num, resource_to_read->ctx->streams[0]->time_base.den));
+            track_to_read->last_pts += pkt->duration;
+
+            return 0;
+        } else if (ret != AVERROR_EOF) {
+            av_log(s, AV_LOG_ERROR, "Could not get packet from track %d: %s\n", track_to_read->index, av_err2str(ret));
+            return ret;
+        }
+    }
+
+    return AVERROR_EOF;
+}
+
+static int imf_close(AVFormatContext *s)
+{
+    IMFContext *c = s->priv_data;
+
+    av_log(s, AV_LOG_DEBUG, "Close IMF package\n");
+    av_dict_free(&c->avio_opts);
+    av_freep(&c->base_url);
+    imf_asset_locator_map_free(c->asset_locator_map);
+    imf_cpl_free(c->cpl);
+
+    for (int i = 0; i < c->track_count; ++i) {
+        imf_virtual_track_playback_context_free(c->tracks[i]);
+    }
+
+    return 0;
+}
+
+static const AVOption imf_options[] = {
+    {"assetmaps", "IMF CPL-related asset map comma-separated absolute paths. If not specified, the CPL sibling `ASSETMAP.xml` file is used.", offsetof(IMFContext, asset_map_paths), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, AV_OPT_FLAG_DECODING_PARAM},
+    {NULL}};
+
+static const AVClass imf_class = {
+    .class_name = "imf",
+    .item_name = av_default_item_name,
+    .option = imf_options,
+    .version = LIBAVUTIL_VERSION_INT,
+};
+
+const AVInputFormat ff_imf_demuxer = {
+    .name = "imf",
+    .long_name = NULL_IF_CONFIG_SMALL("IMF (Interoperable Master Format)"),
+    .priv_class = &imf_class,
+    .priv_data_size = sizeof(IMFContext),
+    .read_header = imf_read_header,
+    .read_packet = ff_imf_read_packet,
+    .read_close = imf_close,
+    .extensions = "xml",
+    .mime_type = "application/xml,text/xml",
+};