int ff_msgsm_decode_block(AVCodecContext *avctx, int16_t *samples,
const uint8_t *buf)
{
int res;
GetBitContext gb;
init_get_bits(&gb, buf, GSM_MS_BLOCK_SIZE * 8);
res = gsm_decode_block(avctx, samples, &gb);
if (res < 0)
return res;
return gsm_decode_block(avctx, samples + GSM_FRAME_SIZE, &gb);
}
int ff_msgsm_decode_block(AVCodecContext *avctx, int16_t *samples,
const uint8_t *buf, int mode)
{
int res;
BitstreamContext bc;
bitstream_init8(&bc, buf, GSM_MS_BLOCK_SIZE);
res = gsm_decode_block(avctx, samples, &bc, mode);
if (res < 0)
return res;
return gsm_decode_block(avctx, samples + GSM_FRAME_SIZE, &bc, mode);
}
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 = 2 * avctx->frame_size;
if (*data_size < frame_bytes)
return -1;
*data_size = 0;
if(buf_size < avctx->block_align)
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 int gsm_decode_frame(AVCodecContext *avctx, void *data,
int *got_frame_ptr, AVPacket *avpkt)
{
GSMContext *s = avctx->priv_data;
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 */
s->frame.nb_samples = avctx->frame_size;
if ((res = avctx->get_buffer(avctx, &s->frame)) < 0) {
av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
return res;
}
samples = (int16_t *)s->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);
if (res < 0)
return res;
break;
case AV_CODEC_ID_GSM_MS:
res = ff_msgsm_decode_block(avctx, samples, buf);
if (res < 0)
return res;
}
*got_frame_ptr = 1;
*(AVFrame *)data = s->frame;
return avctx->block_align;
}
static int gsm_decode_frame(AVCodecContext *avctx, void *data,
int *got_frame_ptr, AVPacket *avpkt)
{
AVFrame *frame = data;
int res;
BitstreamContext bc;
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) {
av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
return res;
}
samples = (int16_t *)frame->data[0];
switch (avctx->codec_id) {
case AV_CODEC_ID_GSM:
bitstream_init(&bc, buf, buf_size * 8);
if (bitstream_read(&bc, 4) != 0xd)
av_log(avctx, AV_LOG_WARNING, "Missing GSM magic!\n");
res = gsm_decode_block(avctx, samples, &bc, 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;
}
