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s302m: decode directly to the user-provided AVFrame

This commit is contained in:
Justin Ruggles 2012-12-23 19:54:24 -05:00
parent 79fb2a1f17
commit 5d5c248c3d
1 changed files with 8 additions and 26 deletions
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34
libavcodec/s302m.c
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@ -28,10 +28,6 @@
#define AES3_HEADER_LEN 4 #define AES3_HEADER_LEN 4
typedef struct S302MDecodeContext {
AVFrame frame;
} S302MDecodeContext;
static int s302m_parse_frame_header(AVCodecContext *avctx, const uint8_t *buf, static int s302m_parse_frame_header(AVCodecContext *avctx, const uint8_t *buf,
int buf_size) int buf_size)
{ {
@ -82,7 +78,7 @@ static int s302m_parse_frame_header(AVCodecContext *avctx, const uint8_t *buf,
static int s302m_decode_frame(AVCodecContext *avctx, void *data, static int s302m_decode_frame(AVCodecContext *avctx, void *data,
int *got_frame_ptr, AVPacket *avpkt) int *got_frame_ptr, AVPacket *avpkt)
{ {
S302MDecodeContext *s = avctx->priv_data; AVFrame *frame = data;
const uint8_t *buf = avpkt->data; const uint8_t *buf = avpkt->data;
int buf_size = avpkt->size; int buf_size = avpkt->size;
int block_size, ret; int block_size, ret;
@ -96,16 +92,16 @@ static int s302m_decode_frame(AVCodecContext *avctx, void *data,
/* get output buffer */ /* get output buffer */
block_size = (avctx->bits_per_coded_sample + 4) / 4; block_size = (avctx->bits_per_coded_sample + 4) / 4;
s->frame.nb_samples = 2 * (buf_size / block_size) / avctx->channels; frame->nb_samples = 2 * (buf_size / block_size) / avctx->channels;
if ((ret = ff_get_buffer(avctx, &s->frame)) < 0) { if ((ret = ff_get_buffer(avctx, frame)) < 0) {
av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n"); av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
return ret; return ret;
} }
buf_size = (s->frame.nb_samples * avctx->channels / 2) * block_size; buf_size = (frame->nb_samples * avctx->channels / 2) * block_size;
if (avctx->bits_per_coded_sample == 24) { if (avctx->bits_per_coded_sample == 24) {
uint32_t *o = (uint32_t *)s->frame.data[0]; uint32_t *o = (uint32_t *)frame->data[0];
for (; buf_size > 6; buf_size -= 7) { for (; buf_size > 6; buf_size -= 7) {
*o++ = (ff_reverse[buf[2]] << 24) | *o++ = (ff_reverse[buf[2]] << 24) |
(ff_reverse[buf[1]] << 16) | (ff_reverse[buf[1]] << 16) |
@ -117,7 +113,7 @@ static int s302m_decode_frame(AVCodecContext *avctx, void *data,
buf += 7; buf += 7;
} }
} else if (avctx->bits_per_coded_sample == 20) { } else if (avctx->bits_per_coded_sample == 20) {
uint32_t *o = (uint32_t *)s->frame.data[0]; uint32_t *o = (uint32_t *)frame->data[0];
for (; buf_size > 5; buf_size -= 6) { for (; buf_size > 5; buf_size -= 6) {
*o++ = (ff_reverse[buf[2] & 0xf0] << 28) | *o++ = (ff_reverse[buf[2] & 0xf0] << 28) |
(ff_reverse[buf[1]] << 20) | (ff_reverse[buf[1]] << 20) |
@ -128,7 +124,7 @@ static int s302m_decode_frame(AVCodecContext *avctx, void *data,
buf += 6; buf += 6;
} }
} else { } else {
uint16_t *o = (uint16_t *)s->frame.data[0]; uint16_t *o = (uint16_t *)frame->data[0];
for (; buf_size > 4; buf_size -= 5) { for (; buf_size > 4; buf_size -= 5) {
*o++ = (ff_reverse[buf[1]] << 8) | *o++ = (ff_reverse[buf[1]] << 8) |
ff_reverse[buf[0]]; ff_reverse[buf[0]];
@ -139,29 +135,15 @@ static int s302m_decode_frame(AVCodecContext *avctx, void *data,
} }
} }
*got_frame_ptr = 1; *got_frame_ptr = 1;
*(AVFrame *)data = s->frame;
return avpkt->size; return avpkt->size;
} }
static int s302m_decode_init(AVCodecContext *avctx)
{
S302MDecodeContext *s = avctx->priv_data;
avcodec_get_frame_defaults(&s->frame);
avctx->coded_frame = &s->frame;
return 0;
}
AVCodec ff_s302m_decoder = { AVCodec ff_s302m_decoder = {
.name = "s302m", .name = "s302m",
.type = AVMEDIA_TYPE_AUDIO, .type = AVMEDIA_TYPE_AUDIO,
.id = AV_CODEC_ID_S302M, .id = AV_CODEC_ID_S302M,
.priv_data_size = sizeof(S302MDecodeContext),
.init = s302m_decode_init,
.decode = s302m_decode_frame, .decode = s302m_decode_frame,
.capabilities = CODEC_CAP_DR1, .capabilities = CODEC_CAP_DR1,
.long_name = NULL_IF_CONFIG_SMALL("SMPTE 302M"), .long_name = NULL_IF_CONFIG_SMALL("SMPTE 302M"),