mirror of
https://github.com/FFmpeg/FFmpeg.git
synced 2024-12-02 03:06:28 +02:00
4243da4ff4
This is possible, because every given FFCodec has to implement exactly one of these. Doing so decreases sizeof(FFCodec) and therefore decreases the size of the binary. Notice that in case of position-independent code the decrease is in .data.rel.ro, so that this translates to decreased memory consumption. Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
143 lines
4.4 KiB
C
143 lines
4.4 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 "config_components.h"
|
|
|
|
#include "libavutil/channel_layout.h"
|
|
#include "avcodec.h"
|
|
#include "codec_internal.h"
|
|
#include "get_bits.h"
|
|
#include "internal.h"
|
|
#include "msgsmdec.h"
|
|
|
|
#include "gsmdec_template.c"
|
|
|
|
static av_cold int gsm_init(AVCodecContext *avctx)
|
|
{
|
|
av_channel_layout_uninit(&avctx->ch_layout);
|
|
avctx->ch_layout = (AVChannelLayout)AV_CHANNEL_LAYOUT_MONO;
|
|
if (!avctx->sample_rate)
|
|
avctx->sample_rate = 8000;
|
|
avctx->sample_fmt = AV_SAMPLE_FMT_S16;
|
|
|
|
switch (avctx->codec_id) {
|
|
case AV_CODEC_ID_GSM:
|
|
avctx->frame_size = GSM_FRAME_SIZE;
|
|
avctx->block_align = GSM_BLOCK_SIZE;
|
|
break;
|
|
case AV_CODEC_ID_GSM_MS:
|
|
avctx->frame_size = 2 * GSM_FRAME_SIZE;
|
|
if (!avctx->block_align)
|
|
avctx->block_align = GSM_MS_BLOCK_SIZE;
|
|
else
|
|
if (avctx->block_align < MSN_MIN_BLOCK_SIZE ||
|
|
avctx->block_align > GSM_MS_BLOCK_SIZE ||
|
|
(avctx->block_align - MSN_MIN_BLOCK_SIZE) % 3) {
|
|
av_log(avctx, AV_LOG_ERROR, "Invalid block alignment %d\n",
|
|
avctx->block_align);
|
|
return AVERROR_INVALIDDATA;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int gsm_decode_frame(AVCodecContext *avctx, AVFrame *frame,
|
|
int *got_frame_ptr, AVPacket *avpkt)
|
|
{
|
|
int res;
|
|
GetBitContext gb;
|
|
const uint8_t *buf = avpkt->data;
|
|
int buf_size = avpkt->size;
|
|
int16_t *samples;
|
|
|
|
if (buf_size < avctx->block_align) {
|
|
av_log(avctx, AV_LOG_ERROR, "Packet is too small\n");
|
|
return AVERROR_INVALIDDATA;
|
|
}
|
|
|
|
/* get output buffer */
|
|
frame->nb_samples = avctx->frame_size;
|
|
if ((res = ff_get_buffer(avctx, frame, 0)) < 0)
|
|
return res;
|
|
samples = (int16_t *)frame->data[0];
|
|
|
|
switch (avctx->codec_id) {
|
|
case AV_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, GSM_13000);
|
|
if (res < 0)
|
|
return res;
|
|
break;
|
|
case AV_CODEC_ID_GSM_MS:
|
|
res = ff_msgsm_decode_block(avctx, samples, buf,
|
|
(GSM_MS_BLOCK_SIZE - avctx->block_align) / 3);
|
|
if (res < 0)
|
|
return res;
|
|
}
|
|
|
|
*got_frame_ptr = 1;
|
|
|
|
return avctx->block_align;
|
|
}
|
|
|
|
static void gsm_flush(AVCodecContext *avctx)
|
|
{
|
|
GSMContext *s = avctx->priv_data;
|
|
memset(s, 0, sizeof(*s));
|
|
}
|
|
|
|
#if CONFIG_GSM_DECODER
|
|
const FFCodec ff_gsm_decoder = {
|
|
.p.name = "gsm",
|
|
.p.long_name = NULL_IF_CONFIG_SMALL("GSM"),
|
|
.p.type = AVMEDIA_TYPE_AUDIO,
|
|
.p.id = AV_CODEC_ID_GSM,
|
|
.priv_data_size = sizeof(GSMContext),
|
|
.init = gsm_init,
|
|
FF_CODEC_DECODE_CB(gsm_decode_frame),
|
|
.flush = gsm_flush,
|
|
.p.capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_CHANNEL_CONF,
|
|
.caps_internal = FF_CODEC_CAP_INIT_THREADSAFE,
|
|
};
|
|
#endif
|
|
#if CONFIG_GSM_MS_DECODER
|
|
const FFCodec ff_gsm_ms_decoder = {
|
|
.p.name = "gsm_ms",
|
|
.p.long_name = NULL_IF_CONFIG_SMALL("GSM Microsoft variant"),
|
|
.p.type = AVMEDIA_TYPE_AUDIO,
|
|
.p.id = AV_CODEC_ID_GSM_MS,
|
|
.priv_data_size = sizeof(GSMContext),
|
|
.init = gsm_init,
|
|
FF_CODEC_DECODE_CB(gsm_decode_frame),
|
|
.flush = gsm_flush,
|
|
.p.capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_CHANNEL_CONF,
|
|
.caps_internal = FF_CODEC_CAP_INIT_THREADSAFE,
|
|
};
|
|
#endif
|