[FFmpeg-trac] #5537(avcodec:new): ADPCM IMA wave decode error when meet 3 bit-per-sample, 2 channels file
FFmpeg
trac at avcodec.org
Wed May 11 12:31:49 CEST 2016
#5537: ADPCM IMA wave decode error when meet 3 bit-per-sample, 2 channels file
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Reporter: Guiding.Li | Type: defect
Status: new | Priority: normal
Component: avcodec | Version:
Keywords: ADPCM IMA | unspecified
Blocking: | Blocked By:
Analyzed by developer: 0 | Reproduced by developer: 0
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Hi ffmpeg funs,
I am trying to transcode from ADPCM IMA wave to PCM, but find the PCM file
is not correctly.
Error condition:
1. ADPCM IMA wave file
2. Codec ID: AV_CODEC_ID_ADPCM_IMA_WAV
3. Channels: 2
4. Bit_per_sample: 2/3/5
Error analysis:
For 2 channles, we should create bit-reading handle for each channel,
divide the bitstream to 2 parts(L & R), bitstream 4bytes for L channel,
next 4bytes for R channel. Then decode them independently, that will be
succeed.
How to reproduce:
{{{
% ffmpeg -i ima_3_per_samp_48khz_2ch.wav -y -f s16le out.pcm
ffmpeg version 3.0.2
}}}
Thanks in advance.
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Ticket URL: <https://trac.ffmpeg.org/ticket/5537>
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