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Code Issues Releases Activity

tta: add support for decoding 24-bit sample format

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Note that this will not work in most cases with avconv and avplay due to the
AVCODEC_MAX_AUDIO_FRAME_SIZE limit, but it will decode correctly if given a
large enough output buffer.
This commit is contained in:
Justin Ruggles 2011-10-23 16:13:06 -04:00
parent 8664682d0e
commit c6056d4004
1 changed files with 34 additions and 22 deletions
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56
libavcodec/tta.c
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@ -225,14 +225,17 @@ static av_cold int tta_decode_init(AVCodecContext * avctx)
skip_bits(&s->gb, 32); // CRC32 of header
switch(s->bps) {
// case 1: avctx->sample_fmt = AV_SAMPLE_FMT_U8; break;
case 2: avctx->sample_fmt = AV_SAMPLE_FMT_S16; break;
// case 3: avctx->sample_fmt = AV_SAMPLE_FMT_S24; break;
case 4: avctx->sample_fmt = AV_SAMPLE_FMT_S32; break;
default:
av_log_ask_for_sample(s->avctx,
"Invalid/unsupported sample format.\n");
return -1;
case 2:
avctx->sample_fmt = AV_SAMPLE_FMT_S16;
avctx->bits_per_raw_sample = 16;
break;
case 3:
avctx->sample_fmt = AV_SAMPLE_FMT_S32;
avctx->bits_per_raw_sample = 24;
break;
default:
av_log(avctx, AV_LOG_ERROR, "Invalid/unsupported sample format.\n");
return AVERROR_INVALIDDATA;
}
// FIXME: horribly broken, but directly from reference source
@ -259,7 +262,9 @@ static av_cold int tta_decode_init(AVCodecContext * avctx)
return -1;
}
s->decode_buffer = av_mallocz(sizeof(int32_t)*s->frame_length*s->channels);
if (s->bps == 2) {
s->decode_buffer = av_mallocz(sizeof(int32_t)*s->frame_length*s->channels);
}
s->ch_ctx = av_malloc(avctx->channels * sizeof(*s->ch_ctx));
if (!s->ch_ctx)
return AVERROR(ENOMEM);
@ -278,7 +283,7 @@ static int tta_decode_frame(AVCodecContext *avctx,
const uint8_t *buf = avpkt->data;
int buf_size = avpkt->size;
TTAContext *s = avctx->priv_data;
int i;
int i, out_size;
int cur_chan = 0, framelen = s->frame_length;
int32_t *p;
@ -289,11 +294,16 @@ static int tta_decode_frame(AVCodecContext *avctx,
if (!s->total_frames && s->last_frame_length)
framelen = s->last_frame_length;
if (*data_size < (framelen * s->channels * 2)) {
out_size = framelen * s->channels * av_get_bytes_per_sample(avctx->sample_fmt);
if (*data_size < out_size) {
av_log(avctx, AV_LOG_ERROR, "Output buffer size is too small.\n");
return -1;
}
// decode directly to output buffer for 24-bit sample format
if (s->bps == 3)
s->decode_buffer = data;
// init per channel states
for (i = 0; i < s->channels; i++) {
s->ch_ctx[i].predictor = 0;
@ -382,19 +392,21 @@ static int tta_decode_frame(AVCodecContext *avctx,
skip_bits(&s->gb, 32); // frame crc
// convert to output buffer
switch(s->bps) {
case 2: {
uint16_t *samples = data;
for (p = s->decode_buffer; p < s->decode_buffer + (framelen * s->channels); p++) {
*samples++ = *p;
}
*data_size = (uint8_t *)samples - (uint8_t *)data;
break;
}
default:
av_log(s->avctx, AV_LOG_ERROR, "Error, only 16bit samples supported!\n");
if (s->bps == 2) {
int16_t *samples = data;
for (p = s->decode_buffer; p < s->decode_buffer + (framelen * s->channels); p++)
*samples++ = *p;
} else {
// shift samples for 24-bit sample format
int32_t *samples = data;
for (p = s->decode_buffer; p < s->decode_buffer + (framelen * s->channels); p++)
*samples++ <<= 8;
// reset decode buffer
s->decode_buffer = NULL;
}
*data_size = out_size;
return buf_size;
}