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Code Issues Releases Activity

tta: decode directly to the user-provided AVFrame

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This commit is contained in:
Justin Ruggles 2012-12-23 20:06:41 -05:00
parent 3997fef952
commit ad2104ba44
1 changed files with 8 additions and 12 deletions
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20
libavcodec/tta.c
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@ -58,7 +58,6 @@ typedef struct TTAChannel {
typedef struct TTAContext {
AVCodecContext *avctx;
AVFrame frame;
GetBitContext gb;
const AVCRC *crc_table;
@ -303,15 +302,13 @@ static av_cold int tta_decode_init(AVCodecContext * avctx)
return -1;
}
avcodec_get_frame_defaults(&s->frame);
avctx->coded_frame = &s->frame;
return 0;
}
static int tta_decode_frame(AVCodecContext *avctx, void *data,
int *got_frame_ptr, AVPacket *avpkt)
{
AVFrame *frame = data;
const uint8_t *buf = avpkt->data;
int buf_size = avpkt->size;
TTAContext *s = avctx->priv_data;
@ -327,15 +324,15 @@ static int tta_decode_frame(AVCodecContext *avctx, void *data,
init_get_bits(&s->gb, buf, buf_size*8);
/* get output buffer */
s->frame.nb_samples = framelen;
if ((ret = ff_get_buffer(avctx, &s->frame)) < 0) {
frame->nb_samples = framelen;
if ((ret = ff_get_buffer(avctx, frame)) < 0) {
av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
return ret;
}
// decode directly to output buffer for 24-bit sample format
if (s->bps == 3)
s->decode_buffer = (int32_t *)s->frame.data[0];
s->decode_buffer = (int32_t *)frame->data[0];
// init per channel states
for (i = 0; i < s->channels; i++) {
@ -424,7 +421,7 @@ static int tta_decode_frame(AVCodecContext *avctx, void *data,
i++;
// check for last frame
if (i == s->last_frame_length && get_bits_left(&s->gb) / 8 == 4) {
s->frame.nb_samples = framelen = s->last_frame_length;
frame->nb_samples = framelen = s->last_frame_length;
break;
}
}
@ -439,20 +436,19 @@ static int tta_decode_frame(AVCodecContext *avctx, void *data,
// convert to output buffer
if (s->bps == 2) {
int16_t *samples = (int16_t *)s->frame.data[0];
int16_t *samples = (int16_t *)frame->data[0];
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 = (int32_t *)s->frame.data[0];
int32_t *samples = (int32_t *)frame->data[0];
for (i = 0; i < framelen * s->channels; i++)
*samples++ <<= 8;
// reset decode buffer
s->decode_buffer = NULL;
}
*got_frame_ptr = 1;
*(AVFrame *)data = s->frame;
*got_frame_ptr = 1;
return buf_size;
error: