[FFmpeg-devel] [PATCH v3 0/2] Properly decode ogg metadata in ogg/flac chained bitstreams

[FFmpeg-devel] [PATCH v3 0/2] Properly decode ogg metadata in ogg/flac chained bitstreams

[Romain Beauxis]

This is a series of 2 patches to allow proper decoding of ogg metadata
in chained ogg/flac streams.

ogg/flac streams are pretty important because there are perhaps the only
combination of lossless audio codec and open-source container that
allows for proper transmittion of lossless audio data accross systems
such as Icecast, browser media tags and more.

In the context of long-running audio streams, the ogg bitstream specs[1]
have historically been very badly implemented. For each new track and/or
each new metadata, the specs require the logical bitstream to come to a
full EOS and then start with a full new logical stream.

These specs have often been confused with a gobal EOS by most
implementations.

Furtunately, FFmpeg is a little better at that in that it is able to
parsed subsequent chained logical ogg bitstreams and properly output either
encoded ogg packets or decoded audio.

Current limitations with chained ogg streams in FFmpeg include:
* No adjustment underlying PTS or DTS
* Chained bitstreams with more than one underlying type of content
  (audio+video, etc) is not yet supported though this is a much less needed
  feature.

The purpose of the changes in this patch series is to also allow proper
decoding of metadata associated with subsequent streams in chained ogg/flac
bitstream.

This is done by intercepting ogg packets with comments in the
ogg flac demuxer, parsing the comment block and attaching it as
packed AV_PKT_DATA_METADATA_UPDATE side-data.

The new metadata can then be unpacked in the flac decoder and properly
added to the first decoded audio frame after the comment packet.

Along with the changes is a new FATE test validating the implementation.

This solution keeps a proper separation of concerns: ogg packets are
sill output by the demuxer (as shown in the test) but consumer of decoded
data see decoded metadata in the decoded frames.

It is worth noting that is using a mechanism specific to ogg stream that
seemed to only have been used for vorbis streams so far.

Follow-up work not addressed in this series of patch:
* Ensure valid PTS in decoded frames of subsequent streams?
* Generalize this approach to other chained ogg codec.

Thanks,
-- Romain

[1]: https://xiph.org/ogg/doc/framing.html

Romain Beauxis (2):
  libavformat/oggparseflac: Parse ogg/flac comments in new ogg packets,
    add them to ogg stream new_metadata.
  Add stream dump test with test for ogg/flac.

 libavcodec/flacdec.c                  |  20 ++-
 libavformat/oggparseflac.c            |  28 +++++
 tests/Makefile                        |   2 +
 tests/api/Makefile                    |   2 +-
 tests/api/api-dump-stream-meta-test.c | 169 ++++++++++++++++++++++++++
 tests/fate/api.mak                    |   5 +
 tests/fate/ogg-flac.mak               |  11 ++
 7 files changed, 235 insertions(+), 2 deletions(-)
 create mode 100644 tests/api/api-dump-stream-meta-test.c
 create mode 100644 tests/fate/ogg-flac.mak

-- 
2.39.5 (Apple Git-154)

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[FFmpeg-devel] [PATCH v3 1/2] Parse and process ogg/flac comments in chained bitstreams.

[Romain Beauxis]

libavformat/oggparseflac: Parse ogg/flac comments in new ogg packets,
add them to ogg stream new_metadata.

libavcodec/flacdec: Process AV_PKT_DATA_METADATA_UPDATE on new packets,
add them as new metadata on the new decoded audio frame.


---
 libavcodec/flacdec.c       | 20 +++++++++++++++++++-
 libavformat/oggparseflac.c | 28 ++++++++++++++++++++++++++++
 2 files changed, 47 insertions(+), 1 deletion(-)

diff --git a/libavcodec/flacdec.c b/libavcodec/flacdec.c
index ad921a1bd1..337f3e1702 100644
--- a/libavcodec/flacdec.c
+++ b/libavcodec/flacdec.c
@@ -68,6 +68,8 @@ typedef struct FLACContext {
     unsigned int decoded_buffer_size_33bps;
     int buggy_lpc;                          ///< use workaround for old lavc encoded files
 
+    AVDictionary *pending_metadata;
+
     FLACDSPContext dsp;
 } FLACContext;
 
@@ -718,6 +720,8 @@ static int flac_decode_frame(AVCodecContext *avctx, AVFrame *frame,
     int buf_size = avpkt->size;
     FLACContext *s = avctx->priv_data;
     int bytes_read = 0;
+    const uint8_t *side_metadata;
+    size_t size;
     int ret;
 
     *got_frame_ptr = 0;
@@ -728,7 +732,14 @@ static int flac_decode_frame(AVCodecContext *avctx, AVFrame *frame,
     }
 
     if (buf_size > 0 && (*buf & 0x7F) == FLAC_METADATA_TYPE_VORBIS_COMMENT) {
-        av_log(s->avctx, AV_LOG_DEBUG, "skipping vorbis comment\n");
+        /* New metadata */
+        side_metadata = av_packet_get_side_data(avpkt, AV_PKT_DATA_METADATA_UPDATE, &size);
+        if (side_metadata) {
+            av_dict_free(&s->pending_metadata);
+            ret = av_packet_unpack_dictionary(side_metadata, size, &s->pending_metadata);
+            if (ret < 0)
+                return ret;
+        }
         return buf_size;
     }
 
@@ -788,6 +799,12 @@ static int flac_decode_frame(AVCodecContext *avctx, AVFrame *frame,
                buf_size - bytes_read, buf_size);
     }
 
+
+    if (s->pending_metadata) {
+        av_dict_copy(&frame->metadata, s->pending_metadata, AV_DICT_APPEND);
+        av_dict_free(&s->pending_metadata);
+    }
+
     *got_frame_ptr = 1;
 
     return bytes_read;
@@ -799,6 +816,7 @@ static av_cold int flac_decode_close(AVCodecContext *avctx)
 
     av_freep(&s->decoded_buffer);
     av_freep(&s->decoded_buffer_33bps);
+    av_dict_free(&s->pending_metadata);
 
     return 0;
 }
diff --git a/libavformat/oggparseflac.c b/libavformat/oggparseflac.c
index f25ed9cc15..3810806112 100644
--- a/libavformat/oggparseflac.c
+++ b/libavformat/oggparseflac.c
@@ -78,6 +78,32 @@ flac_header (AVFormatContext * s, int idx)
     return 1;
 }
 
+static int
+flac_packet (AVFormatContext * s, int idx)
+{
+    struct ogg *ogg = s->priv_data;
+    struct ogg_stream *os = ogg->streams + idx;
+    AVDictionary *new_metadata = NULL;
+    int ret;
+
+    if (os->psize > 0 && os->buf[os->pstart] &&
+        (os->buf[os->pstart] & 0x7F) == FLAC_METADATA_TYPE_VORBIS_COMMENT) {
+        ret = ff_vorbis_comment(s, &new_metadata, os->buf + os->pstart + 4,
+                                os->psize - 4, 1);
+
+        if (ret < 0)
+            return ret;
+
+        os->new_metadata = av_packet_pack_dictionary(new_metadata, &os->new_metadata_size);
+        av_dict_free(&new_metadata);
+
+        if (!os->new_metadata)
+            return AVERROR(ENOMEM);
+    }
+
+    return 0;
+}
+
 static int
 old_flac_header (AVFormatContext * s, int idx)
 {
@@ -130,6 +156,7 @@ const struct ogg_codec ff_flac_codec = {
     .magic = "\177FLAC",
     .magicsize = 5,
     .header = flac_header,
+    .packet = flac_packet,
     .nb_header = 2,
 };
 
@@ -137,5 +164,6 @@ const struct ogg_codec ff_old_flac_codec = {
     .magic = "fLaC",
     .magicsize = 4,
     .header = old_flac_header,
+    .packet = flac_packet,
     .nb_header = 0,
 };
-- 
2.39.5 (Apple Git-154)

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[FFmpeg-devel] [PATCH v3 2/2] Add stream dump test with test for ogg/flac.

[Romain Beauxis]

This is the new FATE test.

Test samples are available here: https://www.dropbox.com/scl/fo/fxt2edwkyj2mjc9qubku5/AICHxJyxMMAK8MIJqWLcvk4?rlkey=mlt12lsu741ejukz0p5qtn9rq&dl=0

Output prior to the changes is:
Stream ID: 0, codec name: flac, metadata: encoder=Lavc61.19.100 flac:title=First Stream
Stream ID: 0, packet PTS: 0, packet DTS: 0
Stream ID: 0, frame PTS: 0, metadata:
Stream ID: 0, packet PTS: 4608, packet DTS: 4608
Stream ID: 0, frame PTS: 4608, metadata:
Stream ID: 0, packet PTS: 0, packet DTS: 0
Stream ID: 0, packet PTS: 0, packet DTS: 0
Stream ID: 0, packet PTS: 0, packet DTS: 0
Stream ID: 0, frame PTS: 0, metadata:
Stream ID: 0, packet PTS: 4608, packet DTS: 4608
Stream ID: 0, frame PTS: 4608, metadata:

Output after the changes:
Stream ID: 0, codec name: flac, metadata: encoder=Lavc61.19.100 flac:title=First Stream
Stream ID: 0, packet PTS: 0, packet DTS: 0
Stream ID: 0, frame PTS: 0, metadata:
Stream ID: 0, packet PTS: 4608, packet DTS: 4608
Stream ID: 0, frame PTS: 4608, metadata:
Stream ID: 0, packet PTS: 0, packet DTS: 0
Stream ID: 0, packet PTS: 0, packet DTS: 0
Stream ID: 0, packet PTS: 0, packet DTS: 0
Stream ID: 0, frame PTS: 0, metadata: encoder=Lavc61.19.100 flac:title=Second Stream
Stream ID: 0, packet PTS: 4608, packet DTS: 4608
Stream ID: 0, frame PTS: 4608, metadata:

---
 tests/Makefile                        |   2 +
 tests/api/Makefile                    |   2 +-
 tests/api/api-dump-stream-meta-test.c | 169 ++++++++++++++++++++++++++
 tests/fate/api.mak                    |   5 +
 tests/fate/ogg-flac.mak               |  11 ++
 5 files changed, 188 insertions(+), 1 deletion(-)
 create mode 100644 tests/api/api-dump-stream-meta-test.c
 create mode 100644 tests/fate/ogg-flac.mak

diff --git a/tests/Makefile b/tests/Makefile
index f9f5fc07f3..66e5189e6d 100644
--- a/tests/Makefile
+++ b/tests/Makefile
@@ -219,6 +219,7 @@ include $(SRC_PATH)/tests/fate/mpeg4.mak
 include $(SRC_PATH)/tests/fate/mpegps.mak
 include $(SRC_PATH)/tests/fate/mpegts.mak
 include $(SRC_PATH)/tests/fate/mxf.mak
+include $(SRC_PATH)/tests/fate/ogg-flac.mak
 include $(SRC_PATH)/tests/fate/oma.mak
 include $(SRC_PATH)/tests/fate/opus.mak
 include $(SRC_PATH)/tests/fate/pcm.mak
@@ -277,6 +278,7 @@ $(FATE_FFPROBE) $(FATE_FFMPEG_FFPROBE) $(FATE_SAMPLES_FFPROBE) $(FATE_SAMPLES_FF
 $(FATE_SAMPLES_FASTSTART): tools/qt-faststart$(EXESUF)
 $(FATE_SAMPLES_DUMP_DATA) $(FATE_SAMPLES_DUMP_DATA-yes): tools/venc_data_dump$(EXESUF)
 $(FATE_SAMPLES_SCALE_SLICE): tools/scale_slice_test$(EXESUF)
+$(FATE_SAMPLES_DUMP_STREAM_META): tests/api/api-dump-stream-meta-test$(EXESUF)
 
 ifdef SAMPLES
 FATE += $(FATE_EXTERN)
diff --git a/tests/api/Makefile b/tests/api/Makefile
index c96e636756..a2cb06a729 100644
--- a/tests/api/Makefile
+++ b/tests/api/Makefile
@@ -1,7 +1,7 @@
 APITESTPROGS-$(call ENCDEC, FLAC, FLAC) += api-flac
 APITESTPROGS-$(call DEMDEC, H264, H264) += api-h264
 APITESTPROGS-$(call DEMDEC, H264, H264) += api-h264-slice
-APITESTPROGS-yes += api-seek
+APITESTPROGS-yes += api-seek api-dump-stream-meta
 APITESTPROGS-$(call DEMDEC, H263, H263) += api-band
 APITESTPROGS-$(HAVE_THREADS) += api-threadmessage
 APITESTPROGS += $(APITESTPROGS-yes)
diff --git a/tests/api/api-dump-stream-meta-test.c b/tests/api/api-dump-stream-meta-test.c
new file mode 100644
index 0000000000..4ffdfe8213
--- /dev/null
+++ b/tests/api/api-dump-stream-meta-test.c
@@ -0,0 +1,169 @@
+/*
+ * Copyright (c) 2025 Romain Beauxis
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+/**
+ * Dump stream metadata
+ */
+
+#include "libavcodec/avcodec.h"
+#include "libavformat/avformat.h"
+#include "libavutil/timestamp.h"
+
+static int dump_stream_meta(const char *input_filename)
+{
+    const AVCodec *codec = NULL;
+    AVPacket *pkt = NULL;
+    AVFrame *fr = NULL;
+    AVFormatContext *fmt_ctx = NULL;
+    AVCodecContext *ctx = NULL;
+    AVCodecParameters *origin_par = NULL;
+    int audio_stream;
+    int result;
+    char *metadata;
+
+    result = avformat_open_input(&fmt_ctx, input_filename, NULL, NULL);
+    if (result < 0) {
+        av_log(NULL, AV_LOG_ERROR, "Can't open file\n");
+        return result;
+    }
+
+    result = avformat_find_stream_info(fmt_ctx, NULL);
+    if (result < 0) {
+        av_log(NULL, AV_LOG_ERROR, "Can't get stream info\n");
+        goto end;
+    }
+
+    // TODO: add ability to work with video format
+    audio_stream =
+        av_find_best_stream(fmt_ctx, AVMEDIA_TYPE_AUDIO, -1, -1, NULL, 0);
+    if (audio_stream < 0) {
+        av_log(NULL, AV_LOG_ERROR, "Can't find audio stream in input file\n");
+        result = audio_stream;
+        goto end;
+    }
+
+    origin_par = fmt_ctx->streams[audio_stream]->codecpar;
+
+    result = av_dict_get_string(
+        fmt_ctx->streams[audio_stream]->metadata, &metadata, '=', ':');
+    if (result < 0)
+        goto end;
+
+    printf("Stream ID: %d, codec name: %s, metadata: %s\n", audio_stream,
+        avcodec_get_name(origin_par->codec_id), metadata);
+
+    codec = avcodec_find_decoder(origin_par->codec_id);
+    if (!codec) {
+        av_log(NULL, AV_LOG_ERROR, "Can't find decoder\n");
+        result = AVERROR_DECODER_NOT_FOUND;
+        goto end;
+    }
+
+    ctx = avcodec_alloc_context3(codec);
+    if (!ctx) {
+        av_log(NULL, AV_LOG_ERROR, "Can't allocate decoder context\n");
+        result = AVERROR(ENOMEM);
+        goto end;
+    }
+
+    result = avcodec_parameters_to_context(ctx, origin_par);
+    if (result) {
+        av_log(NULL, AV_LOG_ERROR, "Can't copy decoder context\n");
+        goto end;
+    }
+
+    result = avcodec_open2(ctx, codec, NULL);
+    if (result < 0) {
+        av_log(ctx, AV_LOG_ERROR, "Can't open decoder\n");
+        goto end;
+    }
+
+    pkt = av_packet_alloc();
+    if (!pkt) {
+        av_log(NULL, AV_LOG_ERROR, "Cannot allocate packet\n");
+        result = AVERROR(ENOMEM);
+        goto end;
+    }
+
+    fr = av_frame_alloc();
+    if (!fr) {
+        av_log(NULL, AV_LOG_ERROR, "Can't allocate frame\n");
+        result = AVERROR(ENOMEM);
+        goto end;
+    }
+
+    for (;;) {
+        result = av_read_frame(fmt_ctx, pkt);
+        if (result)
+            goto end;
+
+        if (pkt->stream_index != audio_stream) {
+            av_packet_unref(pkt);
+            continue;
+        }
+
+        printf("Stream ID: %d, packet PTS: %s, packet DTS: %s\n",
+            pkt->stream_index, av_ts2str(pkt->pts), av_ts2str(pkt->dts));
+
+        result = avcodec_send_packet(ctx, pkt);
+        av_packet_unref(pkt);
+
+        if (result < 0)
+            goto end;
+
+        result = avcodec_receive_frame(ctx, fr);
+        if (result == AVERROR_EOF) {
+            result = 0;
+            goto end;
+        }
+
+        if (result == AVERROR(EAGAIN))
+            continue;
+
+        result = av_dict_get_string(fr->metadata, &metadata, '=', ':');
+        if (result < 0)
+            goto end;
+
+        printf("Stream ID: %d, frame PTS: %s, metadata: %s\n",
+            pkt->stream_index, av_ts2str(fr->pts), metadata);
+    }
+
+end:
+    av_packet_free(&pkt);
+    av_frame_free(&fr);
+    avformat_close_input(&fmt_ctx);
+    avcodec_free_context(&ctx);
+    return result;
+}
+
+int main(int argc, char **argv)
+{
+    if (argc < 2) {
+        av_log(NULL, AV_LOG_ERROR, "Incorrect input\n");
+        return 1;
+    }
+
+    if (dump_stream_meta(argv[1]) != AVERROR_EOF)
+        return 1;
+
+    return 0;
+}
diff --git a/tests/fate/api.mak b/tests/fate/api.mak
index d2868e57ac..a9872a5589 100644
--- a/tests/fate/api.mak
+++ b/tests/fate/api.mak
@@ -1,3 +1,8 @@
+FATE_API_LIBAVFORMAT-$(call ENCDEC, FLAC, FLAC) += api-dump-stream-meta
+fate-api-ogg-flac-meta: $(APITESTSDIR)/api-dump-stream-meta-test$(EXESUF)
+fate-api-ogg-flac-meta: CMD = run $(APITESTSDIR)/api-flac-test$(EXESUF)
+fate-api-ogg-flac-meta: CMP = null
+
 FATE_API_LIBAVCODEC-$(call ENCDEC, FLAC, FLAC) += fate-api-flac
 fate-api-flac: $(APITESTSDIR)/api-flac-test$(EXESUF)
 fate-api-flac: CMD = run $(APITESTSDIR)/api-flac-test$(EXESUF)
diff --git a/tests/fate/ogg-flac.mak b/tests/fate/ogg-flac.mak
new file mode 100644
index 0000000000..22e2030534
--- /dev/null
+++ b/tests/fate/ogg-flac.mak
@@ -0,0 +1,11 @@
+FATE_OGG_FLAC += fate-ogg-flac-chained-meta
+fate-ogg-flac-chained-meta: REF = $(SAMPLES)/ogg-flac/chained-meta.txt
+fate-ogg-flac-chained-meta: CMD = $(APITESTSDIR)/api-dump-stream-meta-test$(EXESUF) $(TARGET_SAMPLES)/ogg-flac/chained-meta.ogg
+
+FATE_OGG_FLAC-$(call DEMDEC, OGG, FLAC) += $(FATE_OGG_FLAC)
+
+FATE_SAMPLES_DUMP_STREAM_META += $(FATE_OGG_FLAC-yes)
+
+FATE_EXTERN += $(FATE_OGG_FLAC-yes)
+
+fate-ogg-flac: $(FATE_OGG_FLAC-yes)
-- 
2.39.5 (Apple Git-154)

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Re: [FFmpeg-devel] [PATCH v3 2/2] Add stream dump test with test for ogg/flac.

[Michael Niedermayer]

[-- Attachment #1.1: Type: text/plain, Size: 2616 bytes --]

On Tue, Feb 04, 2025 at 07:31:45AM -0500, Romain Beauxis wrote:
> This is the new FATE test.
> 
> Test samples are available here: https://www.dropbox.com/scl/fo/fxt2edwkyj2mjc9qubku5/AICHxJyxMMAK8MIJqWLcvk4?rlkey=mlt12lsu741ejukz0p5qtn9rq&dl=0
> 
> Output prior to the changes is:
> Stream ID: 0, codec name: flac, metadata: encoder=Lavc61.19.100 flac:title=First Stream
> Stream ID: 0, packet PTS: 0, packet DTS: 0
> Stream ID: 0, frame PTS: 0, metadata:
> Stream ID: 0, packet PTS: 4608, packet DTS: 4608
> Stream ID: 0, frame PTS: 4608, metadata:
> Stream ID: 0, packet PTS: 0, packet DTS: 0
> Stream ID: 0, packet PTS: 0, packet DTS: 0
> Stream ID: 0, packet PTS: 0, packet DTS: 0
> Stream ID: 0, frame PTS: 0, metadata:
> Stream ID: 0, packet PTS: 4608, packet DTS: 4608
> Stream ID: 0, frame PTS: 4608, metadata:
> 
> Output after the changes:
> Stream ID: 0, codec name: flac, metadata: encoder=Lavc61.19.100 flac:title=First Stream
> Stream ID: 0, packet PTS: 0, packet DTS: 0
> Stream ID: 0, frame PTS: 0, metadata:
> Stream ID: 0, packet PTS: 4608, packet DTS: 4608
> Stream ID: 0, frame PTS: 4608, metadata:
> Stream ID: 0, packet PTS: 0, packet DTS: 0
> Stream ID: 0, packet PTS: 0, packet DTS: 0
> Stream ID: 0, packet PTS: 0, packet DTS: 0
> Stream ID: 0, frame PTS: 0, metadata: encoder=Lavc61.19.100 flac:title=Second Stream
> Stream ID: 0, packet PTS: 4608, packet DTS: 4608
> Stream ID: 0, frame PTS: 4608, metadata:
> 
> ---
>  tests/Makefile                        |   2 +
>  tests/api/Makefile                    |   2 +-
>  tests/api/api-dump-stream-meta-test.c | 169 ++++++++++++++++++++++++++
>  tests/fate/api.mak                    |   5 +
>  tests/fate/ogg-flac.mak               |  11 ++

This is missing:
./tests/ref/fate/api-dump-stream-meta

also make fate fails like this:
TEST    api-dump-stream-meta
reference file './tests/ref/fate/api-dump-stream-meta' not found
./tests/fate-run.sh: 705: cannot open tests/data/fate/api-dump-stream-meta.diff: No such file
Test api-dump-stream-meta failed. Look at tests/data/fate/api-dump-stream-meta.err for details.
make: *** [tests/Makefile:313: api-dump-stream-meta] Error 1

but the failed part cant be run

make api-dump-stream-meta
make: *** No rule to make target 'api-dump-stream-meta'.  Stop.

also if i add a empty reference file
make fate passes

so it seems there is some bug in this

thx

[...]
-- 
Michael     GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB

Republics decline into democracies and democracies degenerate into
despotisms. -- Aristotle

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