FFmpeg/libavcodec/libspeexdec.c
Stefano Sabatini 72415b2adb Define AVMediaType enum, and use it instead of enum CodecType, which
is deprecated and will be dropped at the next major bump.

Originally committed as revision 22735 to svn://svn.ffmpeg.org/ffmpeg/trunk
2010-03-30 23:30:55 +00:00

152 lines
4.6 KiB
C

/*
* Copyright (C) 2008 David Conrad
*
* 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
*/
#include "avcodec.h"
#include <speex/speex.h>
#include <speex/speex_header.h>
#include <speex/speex_stereo.h>
#include <speex/speex_callbacks.h>
typedef struct {
SpeexBits bits;
SpeexStereoState stereo;
void *dec_state;
SpeexHeader *header;
int frame_size;
} LibSpeexContext;
static av_cold int libspeex_decode_init(AVCodecContext *avctx)
{
LibSpeexContext *s = avctx->priv_data;
const SpeexMode *mode;
// defaults in the case of a missing header
if (avctx->sample_rate <= 8000)
mode = &speex_nb_mode;
else if (avctx->sample_rate <= 16000)
mode = &speex_wb_mode;
else
mode = &speex_uwb_mode;
if (avctx->extradata_size >= 80)
s->header = speex_packet_to_header(avctx->extradata, avctx->extradata_size);
avctx->sample_fmt = SAMPLE_FMT_S16;
if (s->header) {
avctx->sample_rate = s->header->rate;
avctx->channels = s->header->nb_channels;
avctx->frame_size = s->frame_size = s->header->frame_size;
if (s->header->frames_per_packet)
avctx->frame_size *= s->header->frames_per_packet;
mode = speex_lib_get_mode(s->header->mode);
if (!mode) {
av_log(avctx, AV_LOG_ERROR, "Unknown Speex mode %d", s->header->mode);
return -1;
}
} else
av_log(avctx, AV_LOG_INFO, "Missing Speex header, assuming defaults.\n");
if (avctx->channels > 2) {
av_log(avctx, AV_LOG_ERROR, "Only stereo and mono are supported.\n");
return -1;
}
speex_bits_init(&s->bits);
s->dec_state = speex_decoder_init(mode);
if (!s->dec_state) {
av_log(avctx, AV_LOG_ERROR, "Error initializing libspeex decoder.\n");
return -1;
}
if (!s->header) {
speex_decoder_ctl(s->dec_state, SPEEX_GET_FRAME_SIZE, &s->frame_size);
}
if (avctx->channels == 2) {
SpeexCallback callback;
callback.callback_id = SPEEX_INBAND_STEREO;
callback.func = speex_std_stereo_request_handler;
callback.data = &s->stereo;
s->stereo = (SpeexStereoState)SPEEX_STEREO_STATE_INIT;
speex_decoder_ctl(s->dec_state, SPEEX_SET_HANDLER, &callback);
}
return 0;
}
static int libspeex_decode_frame(AVCodecContext *avctx,
void *data, int *data_size,
AVPacket *avpkt)
{
const uint8_t *buf = avpkt->data;
int buf_size = avpkt->size;
LibSpeexContext *s = avctx->priv_data;
int16_t *output = data, *end;
int i, num_samples;
num_samples = s->frame_size * avctx->channels;
end = output + *data_size / sizeof(*output);
speex_bits_read_from(&s->bits, buf, buf_size);
for (i = 0; speex_bits_remaining(&s->bits) && output + num_samples < end; i++) {
int ret = speex_decode_int(s->dec_state, &s->bits, output);
if (ret <= -2) {
av_log(avctx, AV_LOG_ERROR, "Error decoding Speex frame.\n");
return -1;
} else if (ret == -1)
// end of stream
break;
if (avctx->channels == 2)
speex_decode_stereo_int(output, s->frame_size, &s->stereo);
output += num_samples;
}
avctx->frame_size = s->frame_size * i;
*data_size = avctx->channels * avctx->frame_size * sizeof(*output);
return buf_size;
}
static av_cold int libspeex_decode_close(AVCodecContext *avctx)
{
LibSpeexContext *s = avctx->priv_data;
speex_header_free(s->header);
speex_bits_destroy(&s->bits);
speex_decoder_destroy(s->dec_state);
return 0;
}
AVCodec libspeex_decoder = {
"libspeex",
AVMEDIA_TYPE_AUDIO,
CODEC_ID_SPEEX,
sizeof(LibSpeexContext),
libspeex_decode_init,
NULL,
libspeex_decode_close,
libspeex_decode_frame,
.long_name = NULL_IF_CONFIG_SMALL("libspeex Speex"),
};