AV_CH_LAYOUT_QUAD is the only (multi-) channel layout that has the
same channel ordering for FFmpeg and alsa.

The functions will also be used for unsigned formats.

* qatar/master: (32 commits)
  libopencore-amr, libvo-amrwbenc: Allow enabling DTX via private AVOptions
  libopencore-amr, libvo-amrwbenc: Only check the bitrate when changed
  libopencore-amr, libvo-amrwbenc: Find the closest matching bitrate
  libvo-*: Fix up the long codec names
  libavcodec: Mark AVCodec->priv_class const
  swscale: Factorize FAST_BGR2YV12 definition.
  libvo-aacenc: Only produce extradata if the global header flag is set
  lavf: postpone removal of public metadata conversion API
  lavc: postpone removal of request_channels
  lavc: postpone removal of audioconvert and sample_fmt wrappers
  lavf: postpone removal of deprecated avio functions
  libopencore-amr: Cosmetics: Rewrap and align
  libopencore-amr, libvo-amrbwenc: Rename variables and functions
  libopencore-amr: Convert commented out debug logging into av_dlog
  libopencore-amr: Remove an unused state variable
  libvo-amrwbenc: Don't explicitly store bitrate modes in the bitrate table
  libopencore-amr: Remove a useless local variable
  libopencore-amr, libvo-amrwbenc: Make the bitrate/mode mapping array static const
  libopencore-amr, libvo-amrwbenc: Return proper error codes in most places
  libopencore-amr: Don't print carriage returns in log messages
  ...

Conflicts:
	doc/developer.texi
	libavcodec/avcodec.h
	libavcodec/libvo-aacenc.c
	libavcodec/libvo-amrwbenc.c
Merged-by: Michael Niedermayer <michaelni@gmx.at>

DTX, discontinuous transmission, allows emitting frames with
comfort noise when no voice is detected in the input audio.
Signed-off-by: Martin Storsjö <martin@martin.st>

Also rename the incorrectly named enc_bitrate to enc_mode, use the
enc_bitrate variable for storing the last chosen bitrate.

This avoids continuous warning log messages if not using an
exactly matching bitrate, while still allowing changing bitrate
at any point.
Signed-off-by: Martin Storsjö <martin@martin.st>

Dynamically print the supported bitrates from the local table,
instead of using a hardcoded log message.
Signed-off-by: Martin Storsjö <martin@martin.st>

Include VisualOn to clarify the codec name, but remove the
actual library name from the user-friendly description.
Also mention Android, to clarify which VisualOn implementation
this refers to, since they do sell other variants of the same
code, too.
Signed-off-by: Martin Storsjö <martin@martin.st>

This avoids warnings of this kind, everywhere priv_class
is initialized:

warning: initialization discards qualifiers from pointer target type
Signed-off-by: Martin Storsjö <martin@martin.st>

It is used only for x86 so it will eventually be moved with that code
into the x86 arch subdirectory.

Signed-off-by: Martin Storsjö <martin@martin.st>

It's been deprecated only a few months ago, long after 0.6.

No decoder uses the supposed replacement, request_channel_layout, yet.

Those were moved to libavutil only recently.

They've been deprecated very recently.

Signed-off-by: Martin Storsjö <martin@martin.st>

Avoid camelCase names for functions and variables.
Signed-off-by: Martin Storsjö <martin@martin.st>

Also add the avctx as logging context.
Signed-off-by: Martin Storsjö <martin@martin.st>

Signed-off-by: Martin Storsjö <martin@martin.st>

The bitrate modes are equal to the array indices.
Signed-off-by: Martin Storsjö <martin@martin.st>

Signed-off-by: Martin Storsjö <martin@martin.st>

Signed-off-by: Martin Storsjö <martin@martin.st>

Signed-off-by: Martin Storsjö <martin@martin.st>

Signed-off-by: Martin Storsjö <martin@martin.st>

Signed-off-by: Martin Storsjö <martin@martin.st>

Signed-off-by: Martin Storsjö <martin@martin.st>

This parts are heritage from the encoder part from the old
libamr code removed in SVN rev 19365.
Signed-off-by: Martin Storsjö <martin@martin.st>

This code could be executed if the demuxer reads more than one
segment before returning from av_open_input_stream.
Signed-off-by: Martin Storsjö <martin@martin.st>

The new option allows to select the starting show mode.

Also rename VideoState->show_audio to show_mode.
Improve readability.

Move up the definition of audio_write_get_buf_size(), so that it is
defined before it is used. Simplify.

When CONFIG_AVFILTER, use a AVFrame -> AVPicture cast rather than
explicitely copy the image information from AVFrame to a new
AVPicture.
Signed-off-by: Stefano Sabatini <stefano.sabatini-lala@poste.it>

Signed-off-by: Stefano Sabatini <stefano.sabatini-lala@poste.it>