From: Marton Balint <cus@passwd.hu>
To: FFmpeg development discussions and patches <ffmpeg-devel@ffmpeg.org>
Subject: Re: [FFmpeg-devel] [PATCH v3 7/9] avformat/pcm: factorize and improve determining the default packet size
Date: Sat, 16 Mar 2024 09:45:07 +0100 (CET)
Message-ID: <3293dd9c-7f87-04ba-8ebf-63909bdda49b@passwd.hu> (raw)
In-Reply-To: <20240314231850.8225-1-cus@passwd.hu>
On Fri, 15 Mar 2024, Marton Balint wrote:
> - Remove the 1024 cap on the number of samples, for high sample rate audio it
> was suboptimal, calculate the low neighbour power of two for the number of
> samples (audio blocks) instead.
> - Make the function work correctly also for non-pcm codecs by using the stream
> bitrate to estimate the target packet size. A previous version of this patch
> used av_get_audio_frame_duration2() the estimate the desired packet size, but
> for some codecs that returns the duration of a single audio frame regardless
> of frame_bytes.
> - Fallback to 4096/block_align*block_align if bitrate is not available.
Will apply the this and the rest of the series.
Regards,
Marton
>
> Signed-off-by: Marton Balint <cus@passwd.hu>
> ---
> libavformat/pcm.c | 41 ++++++++++++++++++++++++++-----------
> libavformat/pcm.h | 1 +
> tests/ref/seek/lavf-al | 46 +++++++++++++++++++++---------------------
> tests/ref/seek/lavf-ul | 46 +++++++++++++++++++++---------------------
> 4 files changed, 76 insertions(+), 58 deletions(-)
>
> diff --git a/libavformat/pcm.c b/libavformat/pcm.c
> index 9741f73667..9676da3251 100644
> --- a/libavformat/pcm.c
> +++ b/libavformat/pcm.c
> @@ -24,27 +24,44 @@
> #include "internal.h"
> #include "pcm.h"
>
> -#define RAW_SAMPLES 1024
> +#define PCM_DEMUX_TARGET_FPS 25
>
> -int ff_pcm_read_packet(AVFormatContext *s, AVPacket *pkt)
> +int ff_pcm_default_packet_size(AVCodecParameters *par)
> {
> - AVCodecParameters *par = s->streams[0]->codecpar;
> - int ret, size;
> + int nb_samples, max_samples, bits_per_sample;
> + int64_t bitrate;
>
> if (par->block_align <= 0)
> return AVERROR(EINVAL);
>
> - /*
> - * Compute read size to complete a read every 62ms.
> - * Clamp to RAW_SAMPLES if larger.
> - */
> - size = FFMAX(par->sample_rate/25, 1);
> - if (par->block_align <= INT_MAX / RAW_SAMPLES) {
> - size = FFMIN(size, RAW_SAMPLES) * par->block_align;
> + max_samples = INT_MAX / par->block_align;
> + bits_per_sample = av_get_bits_per_sample(par->codec_id);
> + bitrate = par->bit_rate;
> +
> + /* Don't trust the codecpar bitrate if we can calculate it ourselves */
> + if (bits_per_sample > 0 && par->sample_rate > 0 && par->ch_layout.nb_channels > 0)
> + if ((int64_t)par->sample_rate * par->ch_layout.nb_channels < INT64_MAX / bits_per_sample)
> + bitrate = bits_per_sample * par->sample_rate * par->ch_layout.nb_channels;
> +
> + if (bitrate > 0) {
> + nb_samples = av_clip64(bitrate / 8 / PCM_DEMUX_TARGET_FPS / par->block_align, 1, max_samples);
> + nb_samples = 1 << av_log2(nb_samples);
> } else {
> - size = par->block_align;
> + /* Fallback to a size based method for a non-pcm codec with unknown bitrate */
> + nb_samples = av_clip(4096 / par->block_align, 1, max_samples);
> }
>
> + return par->block_align * nb_samples;
> +}
> +
> +int ff_pcm_read_packet(AVFormatContext *s, AVPacket *pkt)
> +{
> + int ret, size;
> +
> + size = ff_pcm_default_packet_size(s->streams[0]->codecpar);
> + if (size < 0)
> + return size;
> +
> ret = av_get_packet(s->pb, pkt, size);
>
> pkt->flags &= ~AV_PKT_FLAG_CORRUPT;
> diff --git a/libavformat/pcm.h b/libavformat/pcm.h
> index 9af36d5a2e..1928497eed 100644
> --- a/libavformat/pcm.h
> +++ b/libavformat/pcm.h
> @@ -24,6 +24,7 @@
>
> #include "avformat.h"
>
> +int ff_pcm_default_packet_size(AVCodecParameters *par);
> int ff_pcm_read_packet(AVFormatContext *s, AVPacket *pkt);
> int ff_pcm_read_seek(AVFormatContext *s,
> int stream_index, int64_t timestamp, int flags);
> diff --git a/tests/ref/seek/lavf-al b/tests/ref/seek/lavf-al
> index 5a4085af4e..ebf7993425 100644
> --- a/tests/ref/seek/lavf-al
> +++ b/tests/ref/seek/lavf-al
> @@ -1,50 +1,50 @@
> -ret: 0 st: 0 flags:1 dts: 0.000000 pts: 0.000000 pos: 0 size: 882
> +ret: 0 st: 0 flags:1 dts: 0.000000 pts: 0.000000 pos: 0 size: 512
> ret: 0 st:-1 flags:0 ts:-1.000000
> -ret: 0 st: 0 flags:1 dts: 0.000000 pts: 0.000000 pos: 0 size: 882
> +ret: 0 st: 0 flags:1 dts: 0.000000 pts: 0.000000 pos: 0 size: 512
> ret: 0 st:-1 flags:1 ts: 1.894167
> -ret: 0 st: 0 flags:1 dts: 1.894150 pts: 1.894150 pos: 41766 size: 882
> +ret: 0 st: 0 flags:1 dts: 1.894150 pts: 1.894150 pos: 41766 size: 512
> ret: 0 st: 0 flags:0 ts: 0.788345
> -ret: 0 st: 0 flags:1 dts: 0.788345 pts: 0.788345 pos: 17383 size: 882
> +ret: 0 st: 0 flags:1 dts: 0.788345 pts: 0.788345 pos: 17383 size: 512
> ret: 0 st: 0 flags:1 ts:-0.317506
> -ret: 0 st: 0 flags:1 dts: 0.000000 pts: 0.000000 pos: 0 size: 882
> +ret: 0 st: 0 flags:1 dts: 0.000000 pts: 0.000000 pos: 0 size: 512
> ret:-1 st:-1 flags:0 ts: 2.576668
> ret: 0 st:-1 flags:1 ts: 1.470835
> -ret: 0 st: 0 flags:1 dts: 1.470839 pts: 1.470839 pos: 32432 size: 882
> +ret: 0 st: 0 flags:1 dts: 1.470839 pts: 1.470839 pos: 32432 size: 512
> ret: 0 st: 0 flags:0 ts: 0.364989
> -ret: 0 st: 0 flags:1 dts: 0.364989 pts: 0.364989 pos: 8048 size: 882
> +ret: 0 st: 0 flags:1 dts: 0.364989 pts: 0.364989 pos: 8048 size: 512
> ret: 0 st: 0 flags:1 ts:-0.740816
> -ret: 0 st: 0 flags:1 dts: 0.000000 pts: 0.000000 pos: 0 size: 882
> +ret: 0 st: 0 flags:1 dts: 0.000000 pts: 0.000000 pos: 0 size: 512
> ret:-1 st:-1 flags:0 ts: 2.153336
> ret: 0 st:-1 flags:1 ts: 1.047503
> -ret: 0 st: 0 flags:1 dts: 1.047483 pts: 1.047483 pos: 23097 size: 882
> +ret: 0 st: 0 flags:1 dts: 1.047483 pts: 1.047483 pos: 23097 size: 512
> ret: 0 st: 0 flags:0 ts:-0.058322
> -ret: 0 st: 0 flags:1 dts: 0.000000 pts: 0.000000 pos: 0 size: 882
> +ret: 0 st: 0 flags:1 dts: 0.000000 pts: 0.000000 pos: 0 size: 512
> ret: 0 st: 0 flags:1 ts: 2.835828
> -ret: 0 st: 0 flags:1 dts: 1.960000 pts: 1.960000 pos: 43218 size: 882
> +ret: 0 st: 0 flags:1 dts: 1.987029 pts: 1.987029 pos: 43814 size: 286
> ret: 0 st:-1 flags:0 ts: 1.730004
> -ret: 0 st: 0 flags:1 dts: 1.730023 pts: 1.730023 pos: 38147 size: 882
> +ret: 0 st: 0 flags:1 dts: 1.730023 pts: 1.730023 pos: 38147 size: 512
> ret: 0 st:-1 flags:1 ts: 0.624171
> -ret: 0 st: 0 flags:1 dts: 0.624172 pts: 0.624172 pos: 13763 size: 882
> +ret: 0 st: 0 flags:1 dts: 0.624172 pts: 0.624172 pos: 13763 size: 512
> ret: 0 st: 0 flags:0 ts:-0.481678
> -ret: 0 st: 0 flags:1 dts: 0.000000 pts: 0.000000 pos: 0 size: 882
> +ret: 0 st: 0 flags:1 dts: 0.000000 pts: 0.000000 pos: 0 size: 512
> ret: 0 st: 0 flags:1 ts: 2.412517
> -ret: 0 st: 0 flags:1 dts: 1.960000 pts: 1.960000 pos: 43218 size: 882
> +ret: 0 st: 0 flags:1 dts: 1.987029 pts: 1.987029 pos: 43814 size: 286
> ret: 0 st:-1 flags:0 ts: 1.306672
> -ret: 0 st: 0 flags:1 dts: 1.306667 pts: 1.306667 pos: 28812 size: 882
> +ret: 0 st: 0 flags:1 dts: 1.306667 pts: 1.306667 pos: 28812 size: 512
> ret: 0 st:-1 flags:1 ts: 0.200839
> -ret: 0 st: 0 flags:1 dts: 0.200816 pts: 0.200816 pos: 4428 size: 882
> +ret: 0 st: 0 flags:1 dts: 0.200816 pts: 0.200816 pos: 4428 size: 512
> ret: 0 st: 0 flags:0 ts:-0.904989
> -ret: 0 st: 0 flags:1 dts: 0.000000 pts: 0.000000 pos: 0 size: 882
> +ret: 0 st: 0 flags:1 dts: 0.000000 pts: 0.000000 pos: 0 size: 512
> ret: 0 st: 0 flags:1 ts: 1.989161
> ret: 0 st: 0 flags:1 dts: 1.989161 pts: 1.989161 pos: 43861 size: 239
> ret: 0 st:-1 flags:0 ts: 0.883340
> -ret: 0 st: 0 flags:1 dts: 0.883356 pts: 0.883356 pos: 19478 size: 882
> +ret: 0 st: 0 flags:1 dts: 0.883356 pts: 0.883356 pos: 19478 size: 512
> ret: 0 st:-1 flags:1 ts:-0.222493
> -ret: 0 st: 0 flags:1 dts: 0.000000 pts: 0.000000 pos: 0 size: 882
> +ret: 0 st: 0 flags:1 dts: 0.000000 pts: 0.000000 pos: 0 size: 512
> ret:-1 st: 0 flags:0 ts: 2.671655
> ret: 0 st: 0 flags:1 ts: 1.565850
> -ret: 0 st: 0 flags:1 dts: 1.565850 pts: 1.565850 pos: 34527 size: 882
> +ret: 0 st: 0 flags:1 dts: 1.565850 pts: 1.565850 pos: 34527 size: 512
> ret: 0 st:-1 flags:0 ts: 0.460008
> -ret: 0 st: 0 flags:1 dts: 0.460000 pts: 0.460000 pos: 10143 size: 882
> +ret: 0 st: 0 flags:1 dts: 0.460000 pts: 0.460000 pos: 10143 size: 512
> ret: 0 st:-1 flags:1 ts:-0.645825
> -ret: 0 st: 0 flags:1 dts: 0.000000 pts: 0.000000 pos: 0 size: 882
> +ret: 0 st: 0 flags:1 dts: 0.000000 pts: 0.000000 pos: 0 size: 512
> diff --git a/tests/ref/seek/lavf-ul b/tests/ref/seek/lavf-ul
> index 5a4085af4e..ebf7993425 100644
> --- a/tests/ref/seek/lavf-ul
> +++ b/tests/ref/seek/lavf-ul
> @@ -1,50 +1,50 @@
> -ret: 0 st: 0 flags:1 dts: 0.000000 pts: 0.000000 pos: 0 size: 882
> +ret: 0 st: 0 flags:1 dts: 0.000000 pts: 0.000000 pos: 0 size: 512
> ret: 0 st:-1 flags:0 ts:-1.000000
> -ret: 0 st: 0 flags:1 dts: 0.000000 pts: 0.000000 pos: 0 size: 882
> +ret: 0 st: 0 flags:1 dts: 0.000000 pts: 0.000000 pos: 0 size: 512
> ret: 0 st:-1 flags:1 ts: 1.894167
> -ret: 0 st: 0 flags:1 dts: 1.894150 pts: 1.894150 pos: 41766 size: 882
> +ret: 0 st: 0 flags:1 dts: 1.894150 pts: 1.894150 pos: 41766 size: 512
> ret: 0 st: 0 flags:0 ts: 0.788345
> -ret: 0 st: 0 flags:1 dts: 0.788345 pts: 0.788345 pos: 17383 size: 882
> +ret: 0 st: 0 flags:1 dts: 0.788345 pts: 0.788345 pos: 17383 size: 512
> ret: 0 st: 0 flags:1 ts:-0.317506
> -ret: 0 st: 0 flags:1 dts: 0.000000 pts: 0.000000 pos: 0 size: 882
> +ret: 0 st: 0 flags:1 dts: 0.000000 pts: 0.000000 pos: 0 size: 512
> ret:-1 st:-1 flags:0 ts: 2.576668
> ret: 0 st:-1 flags:1 ts: 1.470835
> -ret: 0 st: 0 flags:1 dts: 1.470839 pts: 1.470839 pos: 32432 size: 882
> +ret: 0 st: 0 flags:1 dts: 1.470839 pts: 1.470839 pos: 32432 size: 512
> ret: 0 st: 0 flags:0 ts: 0.364989
> -ret: 0 st: 0 flags:1 dts: 0.364989 pts: 0.364989 pos: 8048 size: 882
> +ret: 0 st: 0 flags:1 dts: 0.364989 pts: 0.364989 pos: 8048 size: 512
> ret: 0 st: 0 flags:1 ts:-0.740816
> -ret: 0 st: 0 flags:1 dts: 0.000000 pts: 0.000000 pos: 0 size: 882
> +ret: 0 st: 0 flags:1 dts: 0.000000 pts: 0.000000 pos: 0 size: 512
> ret:-1 st:-1 flags:0 ts: 2.153336
> ret: 0 st:-1 flags:1 ts: 1.047503
> -ret: 0 st: 0 flags:1 dts: 1.047483 pts: 1.047483 pos: 23097 size: 882
> +ret: 0 st: 0 flags:1 dts: 1.047483 pts: 1.047483 pos: 23097 size: 512
> ret: 0 st: 0 flags:0 ts:-0.058322
> -ret: 0 st: 0 flags:1 dts: 0.000000 pts: 0.000000 pos: 0 size: 882
> +ret: 0 st: 0 flags:1 dts: 0.000000 pts: 0.000000 pos: 0 size: 512
> ret: 0 st: 0 flags:1 ts: 2.835828
> -ret: 0 st: 0 flags:1 dts: 1.960000 pts: 1.960000 pos: 43218 size: 882
> +ret: 0 st: 0 flags:1 dts: 1.987029 pts: 1.987029 pos: 43814 size: 286
> ret: 0 st:-1 flags:0 ts: 1.730004
> -ret: 0 st: 0 flags:1 dts: 1.730023 pts: 1.730023 pos: 38147 size: 882
> +ret: 0 st: 0 flags:1 dts: 1.730023 pts: 1.730023 pos: 38147 size: 512
> ret: 0 st:-1 flags:1 ts: 0.624171
> -ret: 0 st: 0 flags:1 dts: 0.624172 pts: 0.624172 pos: 13763 size: 882
> +ret: 0 st: 0 flags:1 dts: 0.624172 pts: 0.624172 pos: 13763 size: 512
> ret: 0 st: 0 flags:0 ts:-0.481678
> -ret: 0 st: 0 flags:1 dts: 0.000000 pts: 0.000000 pos: 0 size: 882
> +ret: 0 st: 0 flags:1 dts: 0.000000 pts: 0.000000 pos: 0 size: 512
> ret: 0 st: 0 flags:1 ts: 2.412517
> -ret: 0 st: 0 flags:1 dts: 1.960000 pts: 1.960000 pos: 43218 size: 882
> +ret: 0 st: 0 flags:1 dts: 1.987029 pts: 1.987029 pos: 43814 size: 286
> ret: 0 st:-1 flags:0 ts: 1.306672
> -ret: 0 st: 0 flags:1 dts: 1.306667 pts: 1.306667 pos: 28812 size: 882
> +ret: 0 st: 0 flags:1 dts: 1.306667 pts: 1.306667 pos: 28812 size: 512
> ret: 0 st:-1 flags:1 ts: 0.200839
> -ret: 0 st: 0 flags:1 dts: 0.200816 pts: 0.200816 pos: 4428 size: 882
> +ret: 0 st: 0 flags:1 dts: 0.200816 pts: 0.200816 pos: 4428 size: 512
> ret: 0 st: 0 flags:0 ts:-0.904989
> -ret: 0 st: 0 flags:1 dts: 0.000000 pts: 0.000000 pos: 0 size: 882
> +ret: 0 st: 0 flags:1 dts: 0.000000 pts: 0.000000 pos: 0 size: 512
> ret: 0 st: 0 flags:1 ts: 1.989161
> ret: 0 st: 0 flags:1 dts: 1.989161 pts: 1.989161 pos: 43861 size: 239
> ret: 0 st:-1 flags:0 ts: 0.883340
> -ret: 0 st: 0 flags:1 dts: 0.883356 pts: 0.883356 pos: 19478 size: 882
> +ret: 0 st: 0 flags:1 dts: 0.883356 pts: 0.883356 pos: 19478 size: 512
> ret: 0 st:-1 flags:1 ts:-0.222493
> -ret: 0 st: 0 flags:1 dts: 0.000000 pts: 0.000000 pos: 0 size: 882
> +ret: 0 st: 0 flags:1 dts: 0.000000 pts: 0.000000 pos: 0 size: 512
> ret:-1 st: 0 flags:0 ts: 2.671655
> ret: 0 st: 0 flags:1 ts: 1.565850
> -ret: 0 st: 0 flags:1 dts: 1.565850 pts: 1.565850 pos: 34527 size: 882
> +ret: 0 st: 0 flags:1 dts: 1.565850 pts: 1.565850 pos: 34527 size: 512
> ret: 0 st:-1 flags:0 ts: 0.460008
> -ret: 0 st: 0 flags:1 dts: 0.460000 pts: 0.460000 pos: 10143 size: 882
> +ret: 0 st: 0 flags:1 dts: 0.460000 pts: 0.460000 pos: 10143 size: 512
> ret: 0 st:-1 flags:1 ts:-0.645825
> -ret: 0 st: 0 flags:1 dts: 0.000000 pts: 0.000000 pos: 0 size: 882
> +ret: 0 st: 0 flags:1 dts: 0.000000 pts: 0.000000 pos: 0 size: 512
> --
> 2.35.3
>
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next prev parent reply other threads:[~2024-03-16 8:45 UTC|newest]
Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-03-05 22:51 [FFmpeg-devel] [PATCH 1/9] avcodec/bsf/pcm_rechunk: reorder supported codec list Marton Balint
2024-03-05 22:51 ` [FFmpeg-devel] [PATCH 2/9] avcodec/bsf/pcm_rechunk: add some more supported PCM formats Marton Balint
2024-03-06 14:18 ` Stefano Sabatini
2024-03-05 22:51 ` [FFmpeg-devel] [PATCH 3/9] avformat/daudenc: force 2000 sample packet size with a bsf Marton Balint
2024-03-06 14:24 ` Stefano Sabatini
2024-03-05 22:51 ` [FFmpeg-devel] [PATCH 4/9] fate: make filter-channelsplit test use a fixed frame size Marton Balint
2024-03-05 22:51 ` [FFmpeg-devel] [PATCH 5/9] fate: use a fixed wav demux packet size for amix tests Marton Balint
2024-03-05 22:51 ` [FFmpeg-devel] [PATCH 6/9] fate: use atrim filter instead of -frames:a 20 for fate-filter-tremolo Marton Balint
2024-03-05 22:51 ` [FFmpeg-devel] [PATCH 7/9] avformat/pcm: use a common default packet size function for both wav and pcm Marton Balint
2024-03-06 20:37 ` Michael Niedermayer
2024-03-05 22:51 ` [FFmpeg-devel] [PATCH 8/9] avformat/pcm: remove max samples cap when calculating the default packet size Marton Balint
2024-03-05 22:51 ` [FFmpeg-devel] [PATCH 9/9] avformat/pcm: decrease target audio frame per sec to 10 Marton Balint
2024-03-06 13:47 ` [FFmpeg-devel] [PATCH 1/9] avcodec/bsf/pcm_rechunk: reorder supported codec list Stefano Sabatini
2024-03-08 0:53 ` [FFmpeg-devel] [PATCH v2 " Marton Balint
2024-03-08 0:53 ` [FFmpeg-devel] [PATCH v2 2/9] avcodec/bsf/pcm_rechunk: add some more supported PCM formats Marton Balint
2024-03-09 16:21 ` Stefano Sabatini
2024-03-08 0:53 ` [FFmpeg-devel] [PATCH v2 3/9] avformat/daudenc: force 2000 sample packet size with a bsf Marton Balint
2024-03-09 16:23 ` Stefano Sabatini
2024-03-08 0:53 ` [FFmpeg-devel] [PATCH v2 4/9] fate: make filter-channelsplit test use a fixed frame size Marton Balint
2024-03-08 0:53 ` [FFmpeg-devel] [PATCH v2 5/9] fate: use a fixed wav demux packet size for amix tests Marton Balint
2024-03-08 0:53 ` [FFmpeg-devel] [PATCH v2 6/9] fate: use atrim filter instead of -frames:a 20 for fate-filter-tremolo Marton Balint
2024-03-08 0:53 ` [FFmpeg-devel] [PATCH v2 7/9] avformat/pcm: factorize and improve determining the default packet size Marton Balint
2024-03-12 21:31 ` Marton Balint
2024-03-14 23:18 ` [FFmpeg-devel] [PATCH v3 " Marton Balint
2024-03-16 8:45 ` Marton Balint [this message]
2024-03-08 0:53 ` [FFmpeg-devel] [PATCH v2 8/9] avformat/wavdec: use ff_pcm_default_packet_size for " Marton Balint
2024-03-08 0:53 ` [FFmpeg-devel] [PATCH v2 9/9] avformat/pcm: decrease target audio frame per sec to 10 Marton Balint
2024-03-14 8:10 ` Tobias Rapp
2024-03-14 11:12 ` Paul B Mahol
2024-03-14 22:30 ` Marton Balint
2024-03-17 12:44 ` Paul B Mahol
2024-03-14 22:04 ` Marton Balint
2024-03-15 7:54 ` Tobias Rapp
2024-03-09 16:20 ` [FFmpeg-devel] [PATCH v2 1/9] avcodec/bsf/pcm_rechunk: reorder supported codec list Stefano Sabatini
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