Hi there, thanks for the feedback. I made the following changes to the patch:
- hard-code to 40ms delay. Wasn't really sure what a good value is. But given that the is mainly for encoding low-rate sensor data in audio streams, together with a video recording, 40ms should be fine in most cases. - fix issue when sample rate is smaller (<100, now 25). - use ff_log2 for calculating a power of two read size. A power of two to make efficient use of I/O buffers. - remove the superfluous check for multiple input streams. PCM decoders are always single-streams, right?! - remove cosmetic changes, and remove readsize hunk :) any comments? cheers, -phil The blocksize of the PCM decoder is hard-coded. This creates unnecessary delay when reading low-rate (<100Hz) streams. This creates issues when multiplexing multiple streams, since other inputs are only opened/read after a low-rate input block was completely read. This patch decreases the blocksize for low-rate inputs, so approximately a block is read every 40ms. This decreases the startup delay when multiplexing inputs with different rates. Signed-off-by: Philipp M. Scholl <psch...@bawue.de> --- libavformat/pcm.c | 14 ++++++++--- tests/ref/seek/acodec-pcm-f32be | 54 ++++++++++++++++++++--------------------- tests/ref/seek/acodec-pcm-f64be | 54 ++++++++++++++++++++--------------------- tests/ref/seek/lavf-alaw | 44 ++++++++++++++++----------------- tests/ref/seek/lavf-au | 30 +++++++++++------------ tests/ref/seek/lavf-mov | 44 ++++++++++++++++----------------- tests/ref/seek/lavf-mulaw | 44 ++++++++++++++++----------------- tests/ref/seek/lavf-voc | 22 ++++++++--------- 8 files changed, 157 insertions(+), 149 deletions(-) diff --git a/libavformat/pcm.c b/libavformat/pcm.c index 806f91b6b1..48c3c09bb4 100644 --- a/libavformat/pcm.c +++ b/libavformat/pcm.c @@ -28,13 +28,21 @@ int ff_pcm_read_packet(AVFormatContext *s, AVPacket *pkt) { - int ret, size; + int ret, size = INT_MAX; + AVCodecParameters *codec = s->streams[0]->codecpar; + + /* + * Compute read size to complete a read every 40ms. Clamp to RAW_SAMPLES if + * larger. Use power of two as readsize for I/O efficiency. + */ + size = (codec->sample_rate/25 | 1) * codec->block_align; + size = FFMIN(size, RAW_SAMPLES * codec->block_align); + size = 1 << ff_log2(size); - size= RAW_SAMPLES*s->streams[0]->codecpar->block_align; if (size <= 0) return AVERROR(EINVAL); - ret= av_get_packet(s->pb, pkt, size); + ret = av_get_packet(s->pb, pkt, size); pkt->flags &= ~AV_PKT_FLAG_CORRUPT; pkt->stream_index = 0; diff --git a/tests/ref/seek/acodec-pcm-f32be b/tests/ref/seek/acodec-pcm-f32be index b838262b58..89c8e9d7a9 100644 --- a/tests/ref/seek/acodec-pcm-f32be +++ b/tests/ref/seek/acodec-pcm-f32be @@ -1,53 +1,53 @@ -ret: 0 st: 0 flags:1 dts: 0.000000 pts: 0.000000 pos: 32 size: 8192 +ret: 0 st: 0 flags:1 dts: 0.000000 pts: 0.000000 pos: 32 size: 2048 ret: 0 st:-1 flags:0 ts:-1.000000 -ret: 0 st: 0 flags:1 dts: 0.000000 pts: 0.000000 pos: 32 size: 8192 +ret: 0 st: 0 flags:1 dts: 0.000000 pts: 0.000000 pos: 32 size: 2048 ret: 0 st:-1 flags:1 ts: 1.894167 -ret: 0 st: 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flags:0 ts: 0.460008 -ret: 0 st: 0 flags:1 dts: 0.460000 pts: 0.460000 pos: 10143 size: 1024 +ret: 0 st: 0 flags:1 dts: 0.460000 pts: 0.460000 pos: 10143 size: 128 ret: 0 st:-1 flags:1 ts:-0.645825 -ret: 0 st: 0 flags:1 dts: 0.000000 pts: 0.000000 pos: 0 size: 1024 +ret: 0 st: 0 flags:1 dts: 0.000000 pts: 0.000000 pos: 0 size: 128 diff --git a/tests/ref/seek/lavf-voc b/tests/ref/seek/lavf-voc index 014c251129..47d683230a 100644 --- a/tests/ref/seek/lavf-voc +++ b/tests/ref/seek/lavf-voc @@ -1,44 +1,44 @@ -ret: 0 st: 0 flags:1 dts: 0.000000 pts: 0.000000 pos: 32 size: 1024 +ret: 0 st: 0 flags:1 dts: 0.000000 pts: 0.000000 pos: 32 size: 256 ret: 0 st:-1 flags:0 ts:-1.000000 -ret: 0 st: 0 flags:1 dts: 0.000000 pts: 0.000000 pos: 32 size: 1024 +ret: 0 st: 0 flags:1 dts: 0.000000 pts: 0.000000 pos: 32 size: 256 ret: 0 st:-1 flags:1 ts: 1.894167 ret:-EOF ret: 0 st: 0 flags:0 ts: 0.788330 -ret: 0 st: 0 flags:1 dts: 0.800773 pts: 0.800773 pos: 34984 size: 1024 +ret: 0 st: 0 flags:1 dts: 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ts:-0.645825 -- 2.16.1
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