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third_party_ffmpeg/libavcodec/libopencore-amr.c
Justin Ruggles adbf61ff8a libopencore-amr: do not set AVCodecContext.frame_size 
It is not necessary
2012-03-05 13:08:17 -05:00

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/*
* AMR Audio decoder stub
* Copyright (c) 2003 the ffmpeg project
*
* This file is part of Libav.
*
* Libav 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.
*
* Libav 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 Libav; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "avcodec.h"
#include "libavutil/avstring.h"
#include "libavutil/opt.h"
static void amr_decode_fix_avctx(AVCodecContext *avctx)
{
const int is_amr_wb = 1 + (avctx->codec_id == CODEC_ID_AMR_WB);
if (!avctx->sample_rate)
avctx->sample_rate = 8000 * is_amr_wb;
if (!avctx->channels)
avctx->channels = 1;
avctx->sample_fmt = AV_SAMPLE_FMT_S16;
}
#if CONFIG_LIBOPENCORE_AMRNB
#include <opencore-amrnb/interf_dec.h>
#include <opencore-amrnb/interf_enc.h>
/* Common code for fixed and float version*/
typedef struct AMR_bitrates {
int rate;
enum Mode mode;
} AMR_bitrates;
/* Match desired bitrate */
static int get_bitrate_mode(int bitrate, void *log_ctx)
{
/* make the correspondance between bitrate and mode */
static const AMR_bitrates rates[] = {
{ 4750, MR475 }, { 5150, MR515 }, { 5900, MR59 }, { 6700, MR67 },
{ 7400, MR74 }, { 7950, MR795 }, { 10200, MR102 }, { 12200, MR122 }
};
int i, best = -1, min_diff = 0;
char log_buf[200];
for (i = 0; i < 8; i++) {
if (rates[i].rate == bitrate)
return rates[i].mode;
if (best < 0 || abs(rates[i].rate - bitrate) < min_diff) {
best = i;
min_diff = abs(rates[i].rate - bitrate);
}
}
/* no bitrate matching exactly, log a warning */
snprintf(log_buf, sizeof(log_buf), "bitrate not supported: use one of ");
for (i = 0; i < 8; i++)
av_strlcatf(log_buf, sizeof(log_buf), "%.2fk, ", rates[i].rate / 1000.f);
av_strlcatf(log_buf, sizeof(log_buf), "using %.2fk", rates[best].rate / 1000.f);
av_log(log_ctx, AV_LOG_WARNING, "%s\n", log_buf);
return best;
}
typedef struct AMRContext {
AVClass *av_class;
AVFrame frame;
void *dec_state;
void *enc_state;
int enc_bitrate;
int enc_mode;
int enc_dtx;
int enc_last_frame;
} AMRContext;
static const AVOption options[] = {
{ "dtx", "Allow DTX (generate comfort noise)", offsetof(AMRContext, enc_dtx), AV_OPT_TYPE_INT, { 0 }, 0, 1, AV_OPT_FLAG_AUDIO_PARAM | AV_OPT_FLAG_ENCODING_PARAM },
{ NULL }
};
static const AVClass class = {
"libopencore_amrnb", av_default_item_name, options, LIBAVUTIL_VERSION_INT
};
static av_cold int amr_nb_decode_init(AVCodecContext *avctx)
{
AMRContext *s = avctx->priv_data;
s->dec_state = Decoder_Interface_init();
if (!s->dec_state) {
av_log(avctx, AV_LOG_ERROR, "Decoder_Interface_init error\n");
return -1;
}
amr_decode_fix_avctx(avctx);
if (avctx->channels > 1) {
av_log(avctx, AV_LOG_ERROR, "amr_nb: multichannel decoding not supported\n");
return AVERROR(ENOSYS);
}
avcodec_get_frame_defaults(&s->frame);
avctx->coded_frame = &s->frame;
return 0;
}
static av_cold int amr_nb_decode_close(AVCodecContext *avctx)
{
AMRContext *s = avctx->priv_data;
Decoder_Interface_exit(s->dec_state);
return 0;
}
static int amr_nb_decode_frame(AVCodecContext *avctx, void *data,
int *got_frame_ptr, AVPacket *avpkt)
{
const uint8_t *buf = avpkt->data;
int buf_size = avpkt->size;
AMRContext *s = avctx->priv_data;
static const uint8_t block_size[16] = { 12, 13, 15, 17, 19, 20, 26, 31, 5, 0, 0, 0, 0, 0, 0, 0 };
enum Mode dec_mode;
int packet_size, ret;
av_dlog(avctx, "amr_decode_frame buf=%p buf_size=%d frame_count=%d!!\n",
buf, buf_size, avctx->frame_number);
/* get output buffer */
s->frame.nb_samples = 160;
if ((ret = avctx->get_buffer(avctx, &s->frame)) < 0) {
av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
return ret;
}
dec_mode = (buf[0] >> 3) & 0x000F;
packet_size = block_size[dec_mode] + 1;
if (packet_size > buf_size) {
av_log(avctx, AV_LOG_ERROR, "amr frame too short (%u, should be %u)\n",
buf_size, packet_size);
return AVERROR_INVALIDDATA;
}
av_dlog(avctx, "packet_size=%d buf= 0x%X %X %X %X\n",
packet_size, buf[0], buf[1], buf[2], buf[3]);
/* call decoder */
Decoder_Interface_Decode(s->dec_state, buf, (short *)s->frame.data[0], 0);
*got_frame_ptr = 1;
*(AVFrame *)data = s->frame;
return packet_size;
}
AVCodec ff_libopencore_amrnb_decoder = {
.name = "libopencore_amrnb",
.type = AVMEDIA_TYPE_AUDIO,
.id = CODEC_ID_AMR_NB,
.priv_data_size = sizeof(AMRContext),
.init = amr_nb_decode_init,
.close = amr_nb_decode_close,
.decode = amr_nb_decode_frame,
.capabilities = CODEC_CAP_DR1,
.long_name = NULL_IF_CONFIG_SMALL("OpenCORE Adaptive Multi-Rate (AMR) Narrow-Band"),
};
static av_cold int amr_nb_encode_init(AVCodecContext *avctx)
{
AMRContext *s = avctx->priv_data;
if (avctx->sample_rate != 8000) {
av_log(avctx, AV_LOG_ERROR, "Only 8000Hz sample rate supported\n");
return AVERROR(ENOSYS);
}
if (avctx->channels != 1) {
av_log(avctx, AV_LOG_ERROR, "Only mono supported\n");
return AVERROR(ENOSYS);
}
avctx->frame_size = 160;
avctx->delay = 50;
avctx->coded_frame = avcodec_alloc_frame();
if (!avctx->coded_frame)
return AVERROR(ENOMEM);
s->enc_state = Encoder_Interface_init(s->enc_dtx);
if (!s->enc_state) {
av_log(avctx, AV_LOG_ERROR, "Encoder_Interface_init error\n");
av_freep(&avctx->coded_frame);
return -1;
}
s->enc_mode = get_bitrate_mode(avctx->bit_rate, avctx);
s->enc_bitrate = avctx->bit_rate;
return 0;
}
static av_cold int amr_nb_encode_close(AVCodecContext *avctx)
{
AMRContext *s = avctx->priv_data;
Encoder_Interface_exit(s->enc_state);
av_freep(&avctx->coded_frame);
return 0;
}
static int amr_nb_encode_frame(AVCodecContext *avctx,
unsigned char *frame/*out*/,
int buf_size, void *data/*in*/)
{
AMRContext *s = avctx->priv_data;
int written;
int16_t *flush_buf = NULL;
const int16_t *samples = data;
if (s->enc_bitrate != avctx->bit_rate) {
s->enc_mode = get_bitrate_mode(avctx->bit_rate, avctx);
s->enc_bitrate = avctx->bit_rate;
}
if (data) {
if (avctx->frame_size < 160) {
flush_buf = av_mallocz(160 * sizeof(*flush_buf));
if (!flush_buf)
return AVERROR(ENOMEM);
memcpy(flush_buf, samples, avctx->frame_size * sizeof(*flush_buf));
samples = flush_buf;
if (avctx->frame_size < 110)
s->enc_last_frame = -1;
}
} else {
if (s->enc_last_frame < 0)
return 0;
flush_buf = av_mallocz(160 * sizeof(*flush_buf));
if (!flush_buf)
return AVERROR(ENOMEM);
samples = flush_buf;
s->enc_last_frame = -1;
}
written = Encoder_Interface_Encode(s->enc_state, s->enc_mode, samples,
frame, 0);
av_dlog(avctx, "amr_nb_encode_frame encoded %u bytes, bitrate %u, first byte was %#02x\n",
written, s->enc_mode, frame[0]);
av_freep(&flush_buf);
return written;
}
AVCodec ff_libopencore_amrnb_encoder = {
.name = "libopencore_amrnb",
.type = AVMEDIA_TYPE_AUDIO,
.id = CODEC_ID_AMR_NB,
.priv_data_size = sizeof(AMRContext),
.init = amr_nb_encode_init,
.encode = amr_nb_encode_frame,
.close = amr_nb_encode_close,
.capabilities = CODEC_CAP_DELAY | CODEC_CAP_SMALL_LAST_FRAME,
.sample_fmts = (const enum AVSampleFormat[]){AV_SAMPLE_FMT_S16,AV_SAMPLE_FMT_NONE},
.long_name = NULL_IF_CONFIG_SMALL("OpenCORE Adaptive Multi-Rate (AMR) Narrow-Band"),
.priv_class = &class,
};
#endif
/* -----------AMR wideband ------------*/
#if CONFIG_LIBOPENCORE_AMRWB
#include <opencore-amrwb/dec_if.h>
#include <opencore-amrwb/if_rom.h>
typedef struct AMRWBContext {
AVFrame frame;
void *state;
} AMRWBContext;
static av_cold int amr_wb_decode_init(AVCodecContext *avctx)
{
AMRWBContext *s = avctx->priv_data;
s->state = D_IF_init();
amr_decode_fix_avctx(avctx);
if (avctx->channels > 1) {
av_log(avctx, AV_LOG_ERROR, "amr_wb: multichannel decoding not supported\n");
return AVERROR(ENOSYS);
}
avcodec_get_frame_defaults(&s->frame);
avctx->coded_frame = &s->frame;
return 0;
}
static int amr_wb_decode_frame(AVCodecContext *avctx, void *data,
int *got_frame_ptr, AVPacket *avpkt)
{
const uint8_t *buf = avpkt->data;
int buf_size = avpkt->size;
AMRWBContext *s = avctx->priv_data;
int mode, ret;
int packet_size;
static const uint8_t block_size[16] = {18, 24, 33, 37, 41, 47, 51, 59, 61, 6, 6, 0, 0, 0, 1, 1};
/* get output buffer */
s->frame.nb_samples = 320;
if ((ret = avctx->get_buffer(avctx, &s->frame)) < 0) {
av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
return ret;
}
mode = (buf[0] >> 3) & 0x000F;
packet_size = block_size[mode];
if (packet_size > buf_size) {
av_log(avctx, AV_LOG_ERROR, "amr frame too short (%u, should be %u)\n",
buf_size, packet_size + 1);
return AVERROR_INVALIDDATA;
}
D_IF_decode(s->state, buf, (short *)s->frame.data[0], _good_frame);
*got_frame_ptr = 1;
*(AVFrame *)data = s->frame;
return packet_size;
}
static int amr_wb_decode_close(AVCodecContext *avctx)
{
AMRWBContext *s = avctx->priv_data;
D_IF_exit(s->state);
return 0;
}
AVCodec ff_libopencore_amrwb_decoder = {
.name = "libopencore_amrwb",
.type = AVMEDIA_TYPE_AUDIO,
.id = CODEC_ID_AMR_WB,
.priv_data_size = sizeof(AMRWBContext),
.init = amr_wb_decode_init,
.close = amr_wb_decode_close,
.decode = amr_wb_decode_frame,
.capabilities = CODEC_CAP_DR1,
.long_name = NULL_IF_CONFIG_SMALL("OpenCORE Adaptive Multi-Rate (AMR) Wide-Band"),
};
#endif /* CONFIG_LIBOPENCORE_AMRWB */
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