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Code Issues Releases Activity

avcodec/s302m: Check for non PCM Streams

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Allow the user to choose what to do with the non PCM data through AVOptions

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2015-06-04 16:41:18 +02:00
parent a86928d2ab
commit 51080dfa08
1 changed files with 70 additions and 0 deletions
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70
libavcodec/s302m.c
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@ -21,6 +21,7 @@
*/
#include "libavutil/intreadwrite.h"
#include "libavutil/opt.h"
#include "libavutil/log.h"
#include "avcodec.h"
#include "internal.h"
@ -28,6 +29,11 @@
#define AES3_HEADER_LEN 4
typedef struct S302Context {
AVClass *class;
int non_pcm_mode;
} S302Context;
static int s302m_parse_frame_header(AVCodecContext *avctx, const uint8_t *buf,
int buf_size)
{
@ -91,10 +97,13 @@ static int s302m_parse_frame_header(AVCodecContext *avctx, const uint8_t *buf,
static int s302m_decode_frame(AVCodecContext *avctx, void *data,
int *got_frame_ptr, AVPacket *avpkt)
{
S302Context *s = avctx->priv_data;
AVFrame *frame = data;
const uint8_t *buf = avpkt->data;
int buf_size = avpkt->size;
int block_size, ret;
int i;
int non_pcm_data_type = -1;
int frame_size = s302m_parse_frame_header(avctx, buf, buf_size);
if (frame_size < 0)
@ -123,6 +132,16 @@ static int s302m_decode_frame(AVCodecContext *avctx, void *data,
(ff_reverse[buf[3] & 0x0f] << 4);
buf += 7;
}
o = (uint32_t *)frame->data[0];
if (avctx->channels == 2)
for (i=0; i<frame->nb_samples * 2 - 6; i+=2) {
if (o[i] || o[i+1] || o[i+2] || o[i+3])
break;
if (o[i+4] == 0x96F87200U && o[i+5] == 0xA54E1F00) {
non_pcm_data_type = (o[i+6] >> 16) & 0x1F;
break;
}
}
} else if (avctx->bits_per_raw_sample == 20) {
uint32_t *o = (uint32_t *)frame->data[0];
for (; buf_size > 5; buf_size -= 6) {
@ -134,6 +153,16 @@ static int s302m_decode_frame(AVCodecContext *avctx, void *data,
(ff_reverse[buf[3]] << 12);
buf += 6;
}
o = (uint32_t *)frame->data[0];
if (avctx->channels == 2)
for (i=0; i<frame->nb_samples * 2 - 6; i+=2) {
if (o[i] || o[i+1] || o[i+2] || o[i+3])
break;
if (o[i+4] == 0x6F872000U && o[i+5] == 0x54E1F000) {
non_pcm_data_type = (o[i+6] >> 16) & 0x1F;
break;
}
}
} else {
uint16_t *o = (uint16_t *)frame->data[0];
for (; buf_size > 4; buf_size -= 5) {
@ -144,6 +173,28 @@ static int s302m_decode_frame(AVCodecContext *avctx, void *data,
(ff_reverse[buf[2]] >> 4);
buf += 5;
}
o = (uint16_t *)frame->data[0];
if (avctx->channels == 2)
for (i=0; i<frame->nb_samples * 2 - 6; i+=2) {
if (o[i] || o[i+1] || o[i+2] || o[i+3])
break;
if (o[i+4] == 0xF872U && o[i+5] == 0x4E1F) {
non_pcm_data_type = (o[i+6] & 0x1F);
break;
}
}
}
if (non_pcm_data_type != -1) {
if (s->non_pcm_mode == 3) {
av_log(avctx, AV_LOG_ERROR,
"S302 non PCM mode with data type %d not supported\n",
non_pcm_data_type);
return AVERROR_PATCHWELCOME;
}
if (s->non_pcm_mode & 1) {
return avpkt->size;
}
}
*got_frame_ptr = 1;
@ -151,11 +202,30 @@ static int s302m_decode_frame(AVCodecContext *avctx, void *data,
return avpkt->size;
}
#define FLAGS AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_DECODING_PARAM
static const AVOption s302m_options[] = {
{"non_pcm_mode", "Chooses what to do with NON-PCM", offsetof(S302Context, non_pcm_mode), FF_OPT_TYPE_INT, {.i64 = 3}, 0, 3, FLAGS, "non_pcm_mode"},
{"copy" , "Pass NON-PCM through unchanged" , 0, FF_OPT_TYPE_CONST, {.i64 = 0}, 0, 3, FLAGS, "non_pcm_mode"},
{"drop" , "Drop NON-PCM" , 0, FF_OPT_TYPE_CONST, {.i64 = 1}, 0, 3, FLAGS, "non_pcm_mode"},
{"decode_copy" , "Decode if possible else passthrough", 0, FF_OPT_TYPE_CONST, {.i64 = 2}, 0, 3, FLAGS, "non_pcm_mode"},
{"decode_drop" , "Decode if possible else drop" , 0, FF_OPT_TYPE_CONST, {.i64 = 3}, 0, 3, FLAGS, "non_pcm_mode"},
{NULL}
};
static const AVClass s302m_class = {
"SMPTE 302M Decoder",
av_default_item_name,
s302m_options,
LIBAVUTIL_VERSION_INT,
};
AVCodec ff_s302m_decoder = {
.name = "s302m",
.long_name = NULL_IF_CONFIG_SMALL("SMPTE 302M"),
.type = AVMEDIA_TYPE_AUDIO,
.id = AV_CODEC_ID_S302M,
.priv_data_size = sizeof(S302Context),
.decode = s302m_decode_frame,
.capabilities = CODEC_CAP_DR1,
.priv_class = &s302m_class,
};