Commit Graph

7 Commits

Author SHA1 Message Date
Martin Storsjö
b087ce2bee g722: Fix the QMF scaling
This fixes clipping if the encoder input used the full 16 bit
input range (samples with a magnitude below 16383 worked fine).
The filtered subband samples should be 15 bit maximum, while
the code earlier produced them scaled to 16 bit.

This makes the decoder output have double the magnitude
compared to before.

The spec reference samples doesn't test the QMF at all, which
was why this part slipped past initially.

Signed-off-by: Martin Storsjö <martin@martin.st>
2012-03-02 18:58:19 +02:00
Martin Storsjö
6fcbb0f553 g722dec: Signal skipping the lower bits via AVOptions instead of bits_per_coded_sample
This avoids using bits_per_coded_sample for this information.
bits_per_coded_sample should be 4 for this codec normally,
since two samples are encoded into one 8 bit codeword.

In principle, this might be info that needs to be passed from
a demuxer, and in that case, a private AVOption isn't the best
choice, but no such samples are available at the moment, so
that use case is purely theoretical at the moment.

Signed-off-by: Martin Storsjö <martin@martin.st>
2011-12-05 12:41:23 +02:00
Justin Ruggles
0eea212943 Add avcodec_decode_audio4().
Deprecate avcodec_decode_audio3().
Implement audio support in avcodec_default_get_buffer().
Implement the new audio decoder API in all audio decoders.
2011-12-02 17:40:40 -05:00
Justin Ruggles
a3a8572165 g722dec: check output buffer size before decoding 2011-10-25 11:30:50 -04:00
Justin Ruggles
4e41973794 g722dec: cosmetics: reindent/linewrap 2011-10-25 11:30:50 -04:00
Justin Ruggles
d0a196962a g722dec: remove the use of lowres for half-rate decoding.
It is broken because an AVCodecContext can be opened/closed multiple
times, and sample_rate is getting divided by 2 each time that happens.

This removes the only use of lowres for audio.
2011-10-25 11:30:50 -04:00
Justin Ruggles
704721bc9c g722: split decoder and encoder into separate files 2011-10-23 11:42:34 -04:00