mirror of
https://github.com/FFmpeg/FFmpeg.git
synced 2024-12-18 03:19:31 +02:00
988f585fcb
* 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>
119 lines
3.4 KiB
C
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"),
|
|
};
|