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/**
* Speex decoder by Reimar Döffinger <Reimar.Doeffinger@stud.uni-karlsruhe.de>
* License: GPL v2 or later
* This code may be be relicensed under the terms of the GNU LGPL when it
* becomes part of the FFmpeg project (ffmpeg.org)
*/
#include "config.h"
#include <stdlib.h>
#include <speex/speex.h>
#include <speex/speex_stereo.h>
#include <speex/speex_header.h>
#include "ad_internal.h"
static ad_info_t info = {
"Speex audio decoder",
"speex",
"Reimar Döffinger",
"",
""
};
LIBAD_EXTERN(speex)
typedef struct {
SpeexBits bits;
void *dec_context;
SpeexStereoState stereo;
SpeexHeader *hdr;
} context_t;
#define MAX_FRAMES_PER_PACKET 100
static int preinit(sh_audio_t *sh) {
sh->audio_out_minsize = 2 * 320 * MAX_FRAMES_PER_PACKET * 2 * sizeof(short);
return 1;
}
static int init(sh_audio_t *sh) {
context_t *ctx = calloc(1, sizeof(context_t));
const SpeexMode *spx_mode;
const SpeexStereoState st_st = SPEEX_STEREO_STATE_INIT; // hack
if (!sh->wf || sh->wf->cbSize < 80) {
mp_msg(MSGT_DECAUDIO, MSGL_FATAL, "Missing extradata!\n");
return 0;
}
ctx->hdr = speex_packet_to_header((char *)&sh->wf[1], sh->wf->cbSize);
if (ctx->hdr->nb_channels != 1 && ctx->hdr->nb_channels != 2) {
mp_msg(MSGT_DECAUDIO, MSGL_WARN, "Invalid number of channels (%i), "
"assuming mono\n", ctx->hdr->nb_channels);
ctx->hdr->nb_channels = 1;
}
if (ctx->hdr->frames_per_packet > MAX_FRAMES_PER_PACKET) {
mp_msg(MSGT_DECAUDIO, MSGL_WARN, "Invalid number of frames per packet (%i), "
"assuming 1\n", ctx->hdr->frames_per_packet);
ctx->hdr->frames_per_packet = 1;
}
switch (ctx->hdr->mode) {
case 0:
spx_mode = &speex_nb_mode; break;
case 1:
spx_mode = &speex_wb_mode; break;
case 2:
spx_mode = &speex_uwb_mode; break;
default:
mp_msg(MSGT_DECAUDIO, MSGL_WARN, "Unknown speex mode (%i)\n", ctx->hdr->mode);
spx_mode = &speex_nb_mode;
}
ctx->dec_context = speex_decoder_init(spx_mode);
speex_bits_init(&ctx->bits);
memcpy(&ctx->stereo, &st_st, sizeof(ctx->stereo)); // hack part 2
sh->channels = ctx->hdr->nb_channels;
sh->samplerate = ctx->hdr->rate;
sh->samplesize = 2;
sh->sample_format = AF_FORMAT_S16_NE;
sh->context = ctx;
return 1;
}
static void uninit(sh_audio_t *sh) {
context_t *ctx = sh->context;
if (ctx) {
speex_bits_destroy(&ctx->bits);
speex_decoder_destroy(ctx->dec_context);
if (ctx->hdr)
free(ctx->hdr);
free(ctx);
}
ctx = NULL;
}
static int decode_audio(sh_audio_t *sh, unsigned char *buf,
int minlen, int maxlen) {
context_t *ctx = sh->context;
int len, framelen, framesamples;
char *packet;
int i, err;
speex_decoder_ctl(ctx->dec_context, SPEEX_GET_FRAME_SIZE, &framesamples);
framelen = framesamples * ctx->hdr->nb_channels * sizeof(short);
if (maxlen < ctx->hdr->frames_per_packet * framelen) {
mp_msg(MSGT_DECAUDIO, MSGL_V, "maxlen too small in decode_audio\n");
return -1;
}
len = ds_get_packet(sh->ds, (unsigned char **)&packet);
if (len <= 0) return -1;
speex_bits_read_from(&ctx->bits, packet, len);
i = ctx->hdr->frames_per_packet;
do {
err = speex_decode_int(ctx->dec_context, &ctx->bits, (short *)buf);
if (err == -2)
mp_msg(MSGT_DECAUDIO, MSGL_ERR, "Error decoding file.\n");
if (ctx->hdr->nb_channels == 2)
speex_decode_stereo_int((short *)buf, framesamples, &ctx->stereo);
buf = &buf[framelen];
} while (--i > 0);
return ctx->hdr->frames_per_packet * framelen;
}
static int control(sh_audio_t *sh, int cmd, void *arg, ...) {
return CONTROL_UNKNOWN;
}
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