Re: [FFmpeg-devel] [PATCH v10 3/6] avformat/flvenc: support mux av1 in enhanced flv

[Tristan Matthews <tmatth@videolan.org>]

On Mon, May 15, 2023 at 4:43 AM Steven Liu <lq@chinaffmpeg.org> wrote:
>
> Signed-off-by: Steven Liu <lq@chinaffmpeg.org>
> ---
>  libavformat/Makefile |  2 +-
>  libavformat/flvenc.c | 22 ++++++++++++++++++----
>  2 files changed, 19 insertions(+), 5 deletions(-)
>
> diff --git a/libavformat/Makefile b/libavformat/Makefile
> index 1ef3d15467..c868e1626c 100644
> --- a/libavformat/Makefile
> +++ b/libavformat/Makefile
> @@ -214,7 +214,7 @@ OBJS-$(CONFIG_FLAC_MUXER)                += flacenc.o flacenc_header.o \
>  OBJS-$(CONFIG_FLIC_DEMUXER)              += flic.o
>  OBJS-$(CONFIG_FLV_DEMUXER)               += flvdec.o
>  OBJS-$(CONFIG_LIVE_FLV_DEMUXER)          += flvdec.o
> -OBJS-$(CONFIG_FLV_MUXER)                 += flvenc.o avc.o hevc.o
> +OBJS-$(CONFIG_FLV_MUXER)                 += flvenc.o avc.o hevc.o av1.o
>  OBJS-$(CONFIG_FOURXM_DEMUXER)            += 4xm.o
>  OBJS-$(CONFIG_FRAMECRC_MUXER)            += framecrcenc.o framehash.o
>  OBJS-$(CONFIG_FRAMEHASH_MUXER)           += hashenc.o framehash.o
> diff --git a/libavformat/flvenc.c b/libavformat/flvenc.c
> index 35e198fa15..c1784b332d 100644
> --- a/libavformat/flvenc.c
> +++ b/libavformat/flvenc.c
> @@ -28,6 +28,7 @@
>  #include "libavcodec/mpeg4audio.h"
>  #include "avio.h"
>  #include "avc.h"
> +#include "av1.h"
>  #include "hevc.h"
>  #include "avformat.h"
>  #include "flv.h"
> @@ -48,6 +49,7 @@ static const AVCodecTag flv_video_codec_ids[] = {
>      { AV_CODEC_ID_VP6A,     FLV_CODECID_VP6A },
>      { AV_CODEC_ID_H264,     FLV_CODECID_H264 },
>      { AV_CODEC_ID_HEVC,     MKBETAG('h', 'v', 'c', '1') },
> +    { AV_CODEC_ID_AV1,      MKBETAG('a', 'v', '0', '1') },
>      { AV_CODEC_ID_NONE,     0 }
>  };
>
> @@ -491,7 +493,8 @@ static void flv_write_codec_header(AVFormatContext* s, AVCodecParameters* par, i
>      FLVContext *flv = s->priv_data;
>
>      if (par->codec_id == AV_CODEC_ID_AAC || par->codec_id == AV_CODEC_ID_H264
> -            || par->codec_id == AV_CODEC_ID_MPEG4 || par->codec_id == AV_CODEC_ID_HEVC) {
> +            || par->codec_id == AV_CODEC_ID_MPEG4 || par->codec_id == AV_CODEC_ID_HEVC
> +            || par->codec_id == AV_CODEC_ID_AV1) {
>          int64_t pos;
>          avio_w8(pb,
>                  par->codec_type == AVMEDIA_TYPE_VIDEO ?
> @@ -537,6 +540,9 @@ static void flv_write_codec_header(AVFormatContext* s, AVCodecParameters* par, i
>              if (par->codec_id == AV_CODEC_ID_HEVC) {
>                  avio_w8(pb, FLV_IS_EX_HEADER | PacketTypeSequenceStart); // ExVideoTagHeader mode with PacketTypeSequenceStart
>                  avio_write(pb, "hvc1", 4);
> +            } else if (par->codec_id == AV_CODEC_ID_AV1) {
> +                avio_w8(pb, FLV_IS_EX_HEADER | PacketTypeSequenceStart);
> +                avio_write(pb, "av01", 4);
>              } else {
>                  avio_w8(pb, par->codec_tag | FLV_FRAME_KEY); // flags
>                  avio_w8(pb, 0); // AVC sequence header
> @@ -545,6 +551,8 @@ static void flv_write_codec_header(AVFormatContext* s, AVCodecParameters* par, i
>
>              if (par->codec_id == AV_CODEC_ID_HEVC)
>                  ff_isom_write_hvcc(pb, par->extradata, par->extradata_size, 0);
> +            else if (par->codec_id == AV_CODEC_ID_AV1)
> +                ff_isom_write_av1c(pb, par->extradata, par->extradata_size, 1);
>              else
>                  ff_isom_write_avcc(pb, par->extradata, par->extradata_size);
>          }
> @@ -843,13 +851,15 @@ static int flv_write_packet(AVFormatContext *s, AVPacket *pkt)
>      if (par->codec_id == AV_CODEC_ID_VP6F || par->codec_id == AV_CODEC_ID_VP6A ||
>          par->codec_id == AV_CODEC_ID_VP6  || par->codec_id == AV_CODEC_ID_AAC)
>          flags_size = 2;
> -    else if (par->codec_id == AV_CODEC_ID_H264 || par->codec_id == AV_CODEC_ID_MPEG4 || par->codec_id == AV_CODEC_ID_HEVC)
> +    else if (par->codec_id == AV_CODEC_ID_H264 || par->codec_id == AV_CODEC_ID_MPEG4 ||
> +             par->codec_id == AV_CODEC_ID_HEVC || par->codec_id == AV_CODEC_ID_AV1)
>          flags_size = 5;
>      else
>          flags_size = 1;
>
>      if (par->codec_id == AV_CODEC_ID_AAC || par->codec_id == AV_CODEC_ID_H264
> -            || par->codec_id == AV_CODEC_ID_MPEG4 || par->codec_id == AV_CODEC_ID_HEVC) {
> +            || par->codec_id == AV_CODEC_ID_MPEG4 || par->codec_id == AV_CODEC_ID_HEVC
> +            || par->codec_id == AV_CODEC_ID_AV1) {
>          size_t side_size;
>          uint8_t *side = av_packet_get_side_data(pkt, AV_PKT_DATA_NEW_EXTRADATA, &side_size);
>          if (side && side_size > 0 && (side_size != par->extradata_size || memcmp(side, par->extradata, side_size))) {
> @@ -869,7 +879,8 @@ static int flv_write_packet(AVFormatContext *s, AVPacket *pkt)
>                 "Packets are not in the proper order with respect to DTS\n");
>          return AVERROR(EINVAL);
>      }
> -    if (par->codec_id == AV_CODEC_ID_H264 || par->codec_id == AV_CODEC_ID_MPEG4 || par->codec_id == AV_CODEC_ID_HEVC) {
> +    if (par->codec_id == AV_CODEC_ID_H264 || par->codec_id == AV_CODEC_ID_MPEG4 ||
> +        par->codec_id == AV_CODEC_ID_HEVC ||  par->codec_id == AV_CODEC_ID_AV1) {
>          if (pkt->pts == AV_NOPTS_VALUE) {
>              av_log(s, AV_LOG_ERROR, "Packet is missing PTS\n");
>              return AVERROR(EINVAL);
> @@ -982,6 +993,9 @@ static int flv_write_packet(AVFormatContext *s, AVPacket *pkt)
>          if (par->codec_id == AV_CODEC_ID_HEVC) {
>              avio_w8(pb, FLV_IS_EX_HEADER | PacketTypeCodedFramesX); // ExVideoTagHeader mode with PacketTypeCodedFramesX
>              avio_write(pb, "hvc1", 4);
> +        } else if (par->codec_id == AV_CODEC_ID_AV1) {
> +            avio_w8(pb, FLV_IS_EX_HEADER | PacketTypeCodedFrames);

For this and all the other instances of writing the EX_HEADER bytes,
given that in the spec it specifies:
> isExHeader | FrameType     UB[4]

where FrameType is in this context either keyframe (1) or inter frame
(2), shouldn't this be something like:

avio_w8(pb, FLV_IS_EX_HEADER | PacketTypeCodedFramesX | is_keyframe?
FLV_KEY : FLV_INTER);

?

Best,
-t
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