FFmpeg/libavcodec/gsmdec.c
Michael Niedermayer 988f585fcb Merge remote-tracking branch 'qatar/master'
* qatar/master: (44 commits)
  replacement Indeo 3 decoder
  gsm demuxer: do not allocate packet twice.
  flvenc: use first packet delay as global delay.
  ac3enc: doxygen update.
  imc: return error codes instead of 0 for error conditions.
  imc: return meaningful error codes instead of -1
  imc: do not set channel layout for stereo
  imc: validate channel count
  imc: check for ff_fft_init() failure
  imc: check output buffer size before decoding
  imc: use DSPContext.bswap16_buf() to byte-swap packet data
  rtsp: add allowed_media_types option
  libgsm: add flush function to reset the decoder state when seeking
  libgsm: simplify decoding by using a loop
  gsm: log error message when packet is too small
  libgsmdec: do not needlessly set *data_size to 0
  gsmdec: do not needlessly set *data_size to 0
  gsmdec: add flush function to reset the decoder state when seeking
  libgsmdec: check output buffer size before decoding
  gsmdec: log error message when output buffer is too small.
  ...

Conflicts:
	Changelog
	ffplay.c
	libavcodec/indeo3.c
	libavcodec/mjpeg_parser.c
	libavcodec/vp3.c
	libavformat/cutils.c
	libavformat/id3v2.c
	libavutil/parseutils.c

Merged-by: Michael Niedermayer <michaelni@gmx.at>
2011-11-03 02:16:26 +01:00

119 lines
3.4 KiB
C

/*
* gsm 06.10 decoder
* Copyright (c) 2010 Reimar Döffinger <Reimar.Doeffinger@gmx.de>
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/**
* @file
* GSM decoder
*/
#include "avcodec.h"
#include "get_bits.h"
#include "msgsmdec.h"
#include "gsmdec_template.c"
static av_cold int gsm_init(AVCodecContext *avctx)
{
avctx->channels = 1;
if (!avctx->sample_rate)
avctx->sample_rate = 8000;
avctx->sample_fmt = AV_SAMPLE_FMT_S16;
switch (avctx->codec_id) {
case CODEC_ID_GSM:
avctx->frame_size = GSM_FRAME_SIZE;
avctx->block_align = GSM_BLOCK_SIZE;
break;
case CODEC_ID_GSM_MS:
avctx->frame_size = 2 * GSM_FRAME_SIZE;
avctx->block_align = GSM_MS_BLOCK_SIZE;
}
return 0;
}
static int gsm_decode_frame(AVCodecContext *avctx, void *data,
int *data_size, AVPacket *avpkt)
{
int res;
GetBitContext gb;
const uint8_t *buf = avpkt->data;
int buf_size = avpkt->size;
int16_t *samples = data;
int frame_bytes = avctx->frame_size *
av_get_bytes_per_sample(avctx->sample_fmt);
if (*data_size < frame_bytes) {
av_log(avctx, AV_LOG_ERROR, "Output buffer is too small\n");
return AVERROR(EINVAL);
}
if (buf_size < avctx->block_align) {
av_log(avctx, AV_LOG_ERROR, "Packet is too small\n");
return AVERROR_INVALIDDATA;
}
switch (avctx->codec_id) {
case CODEC_ID_GSM:
init_get_bits(&gb, buf, buf_size * 8);
if (get_bits(&gb, 4) != 0xd)
av_log(avctx, AV_LOG_WARNING, "Missing GSM magic!\n");
res = gsm_decode_block(avctx, samples, &gb);
if (res < 0)
return res;
break;
case CODEC_ID_GSM_MS:
res = ff_msgsm_decode_block(avctx, samples, buf);
if (res < 0)
return res;
}
*data_size = frame_bytes;
return avctx->block_align;
}
static void gsm_flush(AVCodecContext *avctx)
{
GSMContext *s = avctx->priv_data;
memset(s, 0, sizeof(*s));
}
AVCodec ff_gsm_decoder = {
.name = "gsm",
.type = AVMEDIA_TYPE_AUDIO,
.id = CODEC_ID_GSM,
.priv_data_size = sizeof(GSMContext),
.init = gsm_init,
.decode = gsm_decode_frame,
.flush = gsm_flush,
.long_name = NULL_IF_CONFIG_SMALL("GSM"),
};
AVCodec ff_gsm_ms_decoder = {
.name = "gsm_ms",
.type = AVMEDIA_TYPE_AUDIO,
.id = CODEC_ID_GSM_MS,
.priv_data_size = sizeof(GSMContext),
.init = gsm_init,
.decode = gsm_decode_frame,
.flush = gsm_flush,
.long_name = NULL_IF_CONFIG_SMALL("GSM Microsoft variant"),
};