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[76.14.89.2]) by smtp.gmail.com with ESMTPSA id d24sm612839pfn.62.2021.09.29.13.48.35 (version=TLS1_2 cipher=ECDHE-ECDSA-CHACHA20-POLY1305 bits=256/256); Wed, 29 Sep 2021 13:48:37 -0700 (PDT) Received: by localhost (sSMTP sendmail emulation); Wed, 29 Sep 2021 13:48:23 -0700 From: pal@sandflow.com To: ffmpeg-devel@ffmpeg.org Date: Wed, 29 Sep 2021 13:47:49 -0700 Message-Id: <20210929204751.6320-3-pal@sandflow.com> X-Mailer: git-send-email 2.32.0.windows.2 In-Reply-To: <20210929204751.6320-1-pal@sandflow.com> References: <20210929204751.6320-1-pal@sandflow.com> MIME-Version: 1.0 Subject: [FFmpeg-devel] [PATCH 3/5] avformat/imf: Demuxer implementation X-BeenThere: ffmpeg-devel@ffmpeg.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: FFmpeg development discussions and patches List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Reply-To: FFmpeg development discussions and patches Cc: Pierre-Anthony Lemieux Errors-To: ffmpeg-devel-bounces@ffmpeg.org Sender: "ffmpeg-devel" X-TUID: YFqdXa1zTUYq From: Pierre-Anthony Lemieux Signed-off-by: Pierre-Anthony Lemieux --- Notes: Implements the IMF demuxer. libavformat/imfdec.c | 646 +++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 646 insertions(+) create mode 100644 libavformat/imfdec.c diff --git a/libavformat/imfdec.c b/libavformat/imfdec.c new file mode 100644 index 0000000000..1dee2ba8bb --- /dev/null +++ b/libavformat/imfdec.c @@ -0,0 +1,646 @@ +/* + * 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. + */ + +/** + * 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 + * @file + * @ingroup lavu_imf + */ + +#include "imf.h" +#include "imf_internal.h" +#include "internal.h" +#include "libavutil/opt.h" +#include "libavutil/bprint.h" +#include "libavutil/avstring.h" +#include "mxf.h" +#include "url.h" +#include +#include + +#define MAX_BPRINT_READ_SIZE (UINT_MAX - 1) +#define DEFAULT_ASSETMAP_SIZE 8 * 1024 + +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; + +int is_url(const char *string) { + char *substr = strstr(string, "://"); + return substr != NULL; +} + +int is_unix_absolute_path(const char *string) { + char *substr = strstr(string, "/"); + int index = (int)(substr - string); + return index == 0; +} + +int is_dos_absolute_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; +} + +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 = 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 (xml_read_UUID(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: " UUID_FORMAT "\n", UID_ARG(asset->uuid)); + + if (!(node = 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 = 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(xml_get_child_element_by_name(node, "Path")); + + if (!is_url(uri) && !is_unix_absolute_path(uri) && !is_dos_absolute_path(uri)) { + uri = av_append_path_component(base_url, uri); + } + + asset->absolute_uri = strdup(uri); + av_free(uri); + + 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)); + (*asset_map)->assets[(*asset_map)->asset_count++] = asset; + } + + return ret; +} + +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; +} + +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]); + } + + 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_ERROR, "Unable to allocate asset map locator\n"); + return AVERROR_BUG; + } + } + + 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 = avio_open2(&in, url, AVIO_FLAG_READ, c->interrupt_callback, &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) { + int ret = 0; + int64_t entry_point; + + if (!track_resource->ctx) { + track_resource->ctx = avformat_alloc_context(); + } + + 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; + } + + ret = avformat_open_input(&track_resource->ctx, track_resource->locator->absolute_uri, NULL, NULL); + 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: " UUID_FORMAT "\n", UID_ARG(track_file_resource->track_file_uuid)); + return AVERROR_INVALIDDATA; + } + + av_log(s, AV_LOG_DEBUG, "Found locator for " 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)); + 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)); + 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 " 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 " 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)); + 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 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 " 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 " 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->base_url = av_dirname(av_strdup(s->url)); + + 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: " 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 " AVRATIONAL_FORMAT " to minimum " AVRATIONAL_FORMAT " (over duration: " AVRATIONAL_FORMAT ")\n", i, AVRATIONAL_ARG(c->tracks[i]->current_timestamp), AVRATIONAL_ARG(minimum_timestamp), 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=" 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, 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", +};