*/
#include "libavutil/intreadwrite.h"
+#include "libavutil/opt.h"
#include "libavutil/log.h"
#include "avcodec.h"
#include "internal.h"
#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)
{
case 8:
avctx->channel_layout = AV_CH_LAYOUT_5POINT1_BACK | AV_CH_LAYOUT_STEREO_DOWNMIX;
}
- avctx->sample_rate = 48000;
- avctx->bit_rate = 48000 * avctx->channels * (avctx->bits_per_raw_sample + 4) +
- 32 * (48000 / (buf_size * 8 /
- (avctx->channels *
- (avctx->bits_per_raw_sample + 4))));
return frame_size;
}
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)
if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
return ret;
+ avctx->bit_rate = 48000 * avctx->channels * (avctx->bits_per_raw_sample + 4) +
+ 32 * 48000 / frame->nb_samples;
buf_size = (frame->nb_samples * avctx->channels / 2) * block_size;
if (avctx->bits_per_raw_sample == 24) {
(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) {
(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) {
(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;
+ }
}
+ avctx->sample_rate = 48000;
+
*got_frame_ptr = 1;
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,
};