[FFmpeg-cvslog] mpeg: K&R formatting cosmetics
Tanja Batchelor
git at videolan.org
Mon Mar 24 06:07:48 CET 2014
ffmpeg | branch: master | Tanja Batchelor <tanjabatchelor at gmail.com> | Thu Mar 20 01:02:42 2014 +0000| [5b8f0a5eac75d16376af60a6f6bb79b3e9e6dab7] | committer: Vittorio Giovara
mpeg: K&R formatting cosmetics
Signed-off-by: Vittorio Giovara <vittorio.giovara at gmail.com>
> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=5b8f0a5eac75d16376af60a6f6bb79b3e9e6dab7
---
libavformat/mpeg.c | 310 ++++++++++++++++++++++++++++------------------------
1 file changed, 169 insertions(+), 141 deletions(-)
diff --git a/libavformat/mpeg.c b/libavformat/mpeg.c
index 7430bb0..7c87517 100644
--- a/libavformat/mpeg.c
+++ b/libavformat/mpeg.c
@@ -31,72 +31,89 @@
#define MAX_SYNC_SIZE 100000
-static int check_pes(uint8_t *p, uint8_t *end){
+static int check_pes(uint8_t *p, uint8_t *end)
+{
int pes1;
- int pes2= (p[3] & 0xC0) == 0x80
- && (p[4] & 0xC0) != 0x40
- &&((p[4] & 0xC0) == 0x00 || (p[4]&0xC0)>>2 == (p[6]&0xF0));
-
- for(p+=3; p<end && *p == 0xFF; p++);
- if((*p&0xC0) == 0x40) p+=2;
- if((*p&0xF0) == 0x20){
- pes1= p[0]&p[2]&p[4]&1;
- }else if((*p&0xF0) == 0x30){
- pes1= p[0]&p[2]&p[4]&p[5]&p[7]&p[9]&1;
- }else
+ int pes2 = (p[3] & 0xC0) == 0x80 &&
+ (p[4] & 0xC0) != 0x40 &&
+ ((p[4] & 0xC0) == 0x00 ||
+ (p[4] & 0xC0) >> 2 == (p[6] & 0xF0));
+
+ for (p += 3; p < end && *p == 0xFF; p++) ;
+ if ((*p & 0xC0) == 0x40)
+ p += 2;
+
+ if ((*p & 0xF0) == 0x20)
+ pes1 = p[0] & p[2] & p[4] & 1;
+ else if ((*p & 0xF0) == 0x30)
+ pes1 = p[0] & p[2] & p[4] & p[5] & p[7] & p[9] & 1;
+ else
pes1 = *p == 0x0F;
- return pes1||pes2;
+ return pes1 || pes2;
}
-static int check_pack_header(const uint8_t *buf) {
+static int check_pack_header(const uint8_t *buf)
+{
return (buf[1] & 0xC0) == 0x40 || (buf[1] & 0xF0) == 0x20;
}
static int mpegps_probe(AVProbeData *p)
{
- uint32_t code= -1;
- int sys=0, pspack=0, priv1=0, vid=0, audio=0, invalid=0;
+ uint32_t code = -1;
int i;
- int score=0;
+ int sys = 0, pspack = 0, priv1 = 0, vid = 0;
+ int audio = 0, invalid = 0, score = 0;
- for(i=0; i<p->buf_size; i++){
- code = (code<<8) + p->buf[i];
+ for (i = 0; i < p->buf_size; i++) {
+ code = (code << 8) + p->buf[i];
if ((code & 0xffffff00) == 0x100) {
- int len= p->buf[i+1] << 8 | p->buf[i+2];
- int pes= check_pes(p->buf+i, p->buf+p->buf_size);
- int pack = check_pack_header(p->buf+i);
-
- if(code == SYSTEM_HEADER_START_CODE) sys++;
- else if(code == PACK_START_CODE && pack) pspack++;
- else if((code & 0xf0) == VIDEO_ID && pes) vid++;
+ int len = p->buf[i + 1] << 8 | p->buf[i + 2];
+ int pes = check_pes(p->buf + i, p->buf + p->buf_size);
+ int pack = check_pack_header(p->buf + i);
+
+ if (code == SYSTEM_HEADER_START_CODE)
+ sys++;
+ else if (code == PACK_START_CODE && pack)
+ pspack++;
+ else if ((code & 0xf0) == VIDEO_ID && pes)
+ vid++;
// skip pes payload to avoid start code emulation for private
// and audio streams
- else if((code & 0xe0) == AUDIO_ID && pes) {audio++; i+=len;}
- else if(code == PRIVATE_STREAM_1 && pes) {priv1++; i+=len;}
-
- else if((code & 0xf0) == VIDEO_ID && !pes) invalid++;
- else if((code & 0xe0) == AUDIO_ID && !pes) invalid++;
- else if(code == PRIVATE_STREAM_1 && !pes) invalid++;
+ else if ((code & 0xe0) == AUDIO_ID && pes) {
+ audio++;
+ i += len;
+ } else if (code == PRIVATE_STREAM_1 && pes) {
+ priv1++;
+ i += len;
+ } else if ((code & 0xf0) == VIDEO_ID && !pes)
+ invalid++;
+ else if ((code & 0xe0) == AUDIO_ID && !pes)
+ invalid++;
+ else if (code == PRIVATE_STREAM_1 && !pes)
+ invalid++;
}
}
- if(vid+audio > invalid) /* invalid VDR files nd short PES streams */
+ if (vid + audio > invalid) /* invalid VDR files nd short PES streams */
score = AVPROBE_SCORE_EXTENSION / 2;
- if(sys>invalid && sys*9 <= pspack*10)
- return pspack > 2 ? AVPROBE_SCORE_EXTENSION + 2 : AVPROBE_SCORE_EXTENSION / 2; // 1 more than .mpg
- if(pspack > invalid && (priv1+vid+audio)*10 >= pspack*9)
- return pspack > 2 ? AVPROBE_SCORE_EXTENSION + 2 : AVPROBE_SCORE_EXTENSION / 2; // 1 more than .mpg
- if((!!vid ^ !!audio) && (audio > 4 || vid > 1) && !sys && !pspack && p->buf_size>2048 && vid + audio > invalid) /* PES stream */
- return (audio > 12 || vid > 3) ? AVPROBE_SCORE_EXTENSION + 2 : AVPROBE_SCORE_EXTENSION / 2;
-
- //02-Penguin.flac has sys:0 priv1:0 pspack:0 vid:0 audio:1
- //mp3_misidentified_2.mp3 has sys:0 priv1:0 pspack:0 vid:0 audio:6
+ if (sys > invalid && sys * 9 <= pspack * 10)
+ return pspack > 2 ? AVPROBE_SCORE_EXTENSION + 2
+ : AVPROBE_SCORE_EXTENSION / 2; // 1 more than .mpg
+ if (pspack > invalid && (priv1 + vid + audio) * 10 >= pspack * 9)
+ return pspack > 2 ? AVPROBE_SCORE_EXTENSION + 2
+ : AVPROBE_SCORE_EXTENSION / 2; // 1 more than .mpg
+ if ((!!vid ^ !!audio) && (audio > 4 || vid > 1) && !sys &&
+ !pspack && p->buf_size > 2048 && vid + audio > invalid) /* PES stream */
+ return (audio > 12 || vid > 3) ? AVPROBE_SCORE_EXTENSION + 2
+ : AVPROBE_SCORE_EXTENSION / 2;
+
+ // 02-Penguin.flac has sys:0 priv1:0 pspack:0 vid:0 audio:1
+ // mp3_misidentified_2.mp3 has sys:0 priv1:0 pspack:0 vid:0 audio:6
return score;
}
-
typedef struct MpegDemuxContext {
int32_t header_state;
unsigned char psm_es_type[256];
@@ -106,11 +123,11 @@ typedef struct MpegDemuxContext {
static int mpegps_read_header(AVFormatContext *s)
{
MpegDemuxContext *m = s->priv_data;
- const char *sofdec = "Sofdec";
+ const char *sofdec = "Sofdec";
int v, i = 0;
m->header_state = 0xff;
- s->ctx_flags |= AVFMTCTX_NOHEADER;
+ s->ctx_flags |= AVFMTCTX_NOHEADER;
m->sofdec = -1;
do {
@@ -129,8 +146,8 @@ static int64_t get_pts(AVIOContext *pb, int c)
{
uint8_t buf[5];
- buf[0] = c<0 ? avio_r8(pb) : c;
- avio_read(pb, buf+1, 4);
+ buf[0] = c < 0 ? avio_r8(pb) : c;
+ avio_read(pb, buf + 1, 4);
return ff_parse_pes_pts(buf);
}
@@ -142,7 +159,7 @@ static int find_next_start_code(AVIOContext *pb, int *size_ptr,
int val, n;
state = *header_state;
- n = *size_ptr;
+ n = *size_ptr;
while (n > 0) {
if (pb->eof_reached)
break;
@@ -150,15 +167,16 @@ static int find_next_start_code(AVIOContext *pb, int *size_ptr,
n--;
if (state == 0x000001) {
state = ((state << 8) | v) & 0xffffff;
- val = state;
+ val = state;
goto found;
}
state = ((state << 8) | v) & 0xffffff;
}
val = -1;
- found:
+
+found:
*header_state = state;
- *size_ptr = n;
+ *size_ptr = n;
return val;
}
@@ -182,10 +200,11 @@ static long mpegps_psm_parse(MpegDemuxContext *m, AVIOContext *pb)
es_map_length = avio_rb16(pb);
/* at least one es available? */
- while (es_map_length >= 4){
+ while (es_map_length >= 4) {
unsigned char type = avio_r8(pb);
unsigned char es_id = avio_r8(pb);
uint16_t es_info_length = avio_rb16(pb);
+
/* remember mapping from stream id to stream type */
m->psm_es_type[es_id] = type;
/* skip program_stream_info */
@@ -197,7 +216,7 @@ static long mpegps_psm_parse(MpegDemuxContext *m, AVIOContext *pb)
}
/* read the next PES header. Return its position in ppos
- (if not NULL), and its start code, pts and dts.
+ * (if not NULL), and its start code, pts and dts.
*/
static int mpegps_read_pes_header(AVFormatContext *s,
int64_t *ppos, int *pstart_code,
@@ -207,20 +226,20 @@ static int mpegps_read_pes_header(AVFormatContext *s,
int len, size, startcode, c, flags, header_len;
int pes_ext, ext2_len, id_ext, skip;
int64_t pts, dts;
- int64_t last_sync= avio_tell(s->pb);
-
- error_redo:
- avio_seek(s->pb, last_sync, SEEK_SET);
- redo:
- /* next start code (should be immediately after) */
- m->header_state = 0xff;
- size = MAX_SYNC_SIZE;
- startcode = find_next_start_code(s->pb, &size, &m->header_state);
- last_sync = avio_tell(s->pb);
- if (startcode < 0){
- if(s->pb->eof_reached)
+ int64_t last_sync = avio_tell(s->pb);
+
+error_redo:
+ avio_seek(s->pb, last_sync, SEEK_SET);
+redo:
+ /* next start code (should be immediately after) */
+ m->header_state = 0xff;
+ size = MAX_SYNC_SIZE;
+ startcode = find_next_start_code(s->pb, &size, &m->header_state);
+ last_sync = avio_tell(s->pb);
+ if (startcode < 0) {
+ if (s->pb->eof_reached)
return AVERROR_EOF;
- //FIXME we should remember header_state
+ // FIXME we should remember header_state
return AVERROR(EAGAIN);
}
@@ -266,7 +285,7 @@ static int mpegps_read_pes_header(AVFormatContext *s,
pts =
dts = AV_NOPTS_VALUE;
/* stuffing */
- for(;;) {
+ for (;;) {
if (len < 1)
goto error_redo;
c = avio_r8(s->pb);
@@ -278,45 +297,47 @@ static int mpegps_read_pes_header(AVFormatContext *s,
if ((c & 0xc0) == 0x40) {
/* buffer scale & size */
avio_r8(s->pb);
- c = avio_r8(s->pb);
+ c = avio_r8(s->pb);
len -= 2;
}
if ((c & 0xe0) == 0x20) {
- dts = pts = get_pts(s->pb, c);
+ dts =
+ pts = get_pts(s->pb, c);
len -= 4;
- if (c & 0x10){
- dts = get_pts(s->pb, -1);
+ if (c & 0x10) {
+ dts = get_pts(s->pb, -1);
len -= 5;
}
} else if ((c & 0xc0) == 0x80) {
/* mpeg 2 PES */
- flags = avio_r8(s->pb);
+ flags = avio_r8(s->pb);
header_len = avio_r8(s->pb);
- len -= 2;
+ len -= 2;
if (header_len > len)
goto error_redo;
len -= header_len;
if (flags & 0x80) {
- dts = pts = get_pts(s->pb, -1);
+ dts = pts = get_pts(s->pb, -1);
header_len -= 5;
if (flags & 0x40) {
- dts = get_pts(s->pb, -1);
+ dts = get_pts(s->pb, -1);
header_len -= 5;
}
}
- if (flags & 0x3f && header_len == 0){
+ if (flags & 0x3f && header_len == 0) {
flags &= 0xC0;
av_log(s, AV_LOG_WARNING, "Further flags set but no bytes left\n");
}
if (flags & 0x01) { /* PES extension */
pes_ext = avio_r8(s->pb);
header_len--;
- /* Skip PES private data, program packet sequence counter and P-STD buffer */
- skip = (pes_ext >> 4) & 0xb;
+ /* Skip PES private data, program packet sequence counter
+ * and P-STD buffer */
+ skip = (pes_ext >> 4) & 0xb;
skip += skip & 0x9;
- if (pes_ext & 0x40 || skip > header_len){
+ if (pes_ext & 0x40 || skip > header_len) {
av_log(s, AV_LOG_WARNING, "pes_ext %X is invalid\n", pes_ext);
- pes_ext=skip=0;
+ pes_ext = skip = 0;
}
avio_skip(s->pb, skip);
header_len -= skip;
@@ -332,11 +353,10 @@ static int mpegps_read_pes_header(AVFormatContext *s,
}
}
}
- if(header_len < 0)
+ if (header_len < 0)
goto error_redo;
avio_skip(s->pb, header_len);
- }
- else if( c!= 0xf )
+ } else if (c != 0xf)
goto redo;
if (startcode == PRIVATE_STREAM_1 && !m->psm_es_type[startcode & 0xff]) {
@@ -355,22 +375,23 @@ static int mpegps_read_pes_header(AVFormatContext *s,
}
}
}
- if(len<0)
+ if (len < 0)
goto error_redo;
- if(dts != AV_NOPTS_VALUE && ppos){
+ if (dts != AV_NOPTS_VALUE && ppos) {
int i;
- for(i=0; i<s->nb_streams; i++){
- if(startcode == s->streams[i]->id &&
- s->pb->seekable /* index useless on streams anyway */) {
+ for (i = 0; i < s->nb_streams; i++) {
+ if (startcode == s->streams[i]->id &&
+ s->pb->seekable /* index useless on streams anyway */) {
ff_reduce_index(s, i);
- av_add_index_entry(s->streams[i], *ppos, dts, 0, 0, AVINDEX_KEYFRAME /* FIXME keyframe? */);
+ av_add_index_entry(s->streams[i], *ppos, dts, 0, 0,
+ AVINDEX_KEYFRAME /* FIXME keyframe? */);
}
}
}
*pstart_code = startcode;
- *ppts = pts;
- *pdts = dts;
+ *ppts = pts;
+ *pdts = dts;
return len;
}
@@ -382,106 +403,111 @@ static int mpegps_read_packet(AVFormatContext *s,
int len, startcode, i, es_type, ret;
enum AVCodecID codec_id = AV_CODEC_ID_NONE;
enum AVMediaType type;
- int64_t pts, dts, dummy_pos; //dummy_pos is needed for the index building to work
+ int64_t pts, dts, dummy_pos; // dummy_pos is needed for the index building to work
uint8_t av_uninit(dvdaudio_substream_type);
- redo:
+redo:
len = mpegps_read_pes_header(s, &dummy_pos, &startcode, &pts, &dts);
if (len < 0)
return len;
- if(startcode == 0x1bd) {
+ if (startcode == 0x1bd) {
dvdaudio_substream_type = avio_r8(s->pb);
avio_skip(s->pb, 3);
len -= 4;
}
/* now find stream */
- for(i=0;i<s->nb_streams;i++) {
+ for (i = 0; i < s->nb_streams; i++) {
st = s->streams[i];
if (st->id == startcode)
goto found;
}
es_type = m->psm_es_type[startcode & 0xff];
- if(es_type > 0 && es_type != STREAM_TYPE_PRIVATE_DATA){
- if(es_type == STREAM_TYPE_VIDEO_MPEG1){
+ if (es_type > 0 && es_type != STREAM_TYPE_PRIVATE_DATA) {
+ if (es_type == STREAM_TYPE_VIDEO_MPEG1) {
codec_id = AV_CODEC_ID_MPEG2VIDEO;
- type = AVMEDIA_TYPE_VIDEO;
- } else if(es_type == STREAM_TYPE_VIDEO_MPEG2){
+ type = AVMEDIA_TYPE_VIDEO;
+ } else if (es_type == STREAM_TYPE_VIDEO_MPEG2) {
codec_id = AV_CODEC_ID_MPEG2VIDEO;
- type = AVMEDIA_TYPE_VIDEO;
- } else if(es_type == STREAM_TYPE_AUDIO_MPEG1 ||
- es_type == STREAM_TYPE_AUDIO_MPEG2){
+ type = AVMEDIA_TYPE_VIDEO;
+ } else if (es_type == STREAM_TYPE_AUDIO_MPEG1 ||
+ es_type == STREAM_TYPE_AUDIO_MPEG2) {
codec_id = AV_CODEC_ID_MP3;
- type = AVMEDIA_TYPE_AUDIO;
- } else if(es_type == STREAM_TYPE_AUDIO_AAC){
+ type = AVMEDIA_TYPE_AUDIO;
+ } else if (es_type == STREAM_TYPE_AUDIO_AAC) {
codec_id = AV_CODEC_ID_AAC;
- type = AVMEDIA_TYPE_AUDIO;
- } else if(es_type == STREAM_TYPE_VIDEO_MPEG4){
+ type = AVMEDIA_TYPE_AUDIO;
+ } else if (es_type == STREAM_TYPE_VIDEO_MPEG4) {
codec_id = AV_CODEC_ID_MPEG4;
- type = AVMEDIA_TYPE_VIDEO;
- } else if(es_type == STREAM_TYPE_VIDEO_H264){
+ type = AVMEDIA_TYPE_VIDEO;
+ } else if (es_type == STREAM_TYPE_VIDEO_H264) {
codec_id = AV_CODEC_ID_H264;
- type = AVMEDIA_TYPE_VIDEO;
- } else if(es_type == STREAM_TYPE_AUDIO_AC3){
+ type = AVMEDIA_TYPE_VIDEO;
+ } else if (es_type == STREAM_TYPE_AUDIO_AC3) {
codec_id = AV_CODEC_ID_AC3;
- type = AVMEDIA_TYPE_AUDIO;
+ type = AVMEDIA_TYPE_AUDIO;
} else {
goto skip;
}
} else if (startcode >= 0x1e0 && startcode <= 0x1ef) {
static const unsigned char avs_seqh[4] = { 0, 0, 1, 0xb0 };
unsigned char buf[8];
+
avio_read(s->pb, buf, 8);
avio_seek(s->pb, -8, SEEK_CUR);
- if(!memcmp(buf, avs_seqh, 4) && (buf[6] != 0 || buf[7] != 1))
+ if (!memcmp(buf, avs_seqh, 4) && (buf[6] != 0 || buf[7] != 1))
codec_id = AV_CODEC_ID_CAVS;
else
codec_id = AV_CODEC_ID_PROBE;
type = AVMEDIA_TYPE_VIDEO;
} else if (startcode >= 0x1c0 && startcode <= 0x1df) {
- type = AVMEDIA_TYPE_AUDIO;
+ type = AVMEDIA_TYPE_AUDIO;
codec_id = m->sofdec > 0 ? AV_CODEC_ID_ADPCM_ADX : AV_CODEC_ID_MP2;
} else if (startcode >= 0x80 && startcode <= 0x87) {
- type = AVMEDIA_TYPE_AUDIO;
+ type = AVMEDIA_TYPE_AUDIO;
codec_id = AV_CODEC_ID_AC3;
- } else if ( ( startcode >= 0x88 && startcode <= 0x8f)
- ||( startcode >= 0x98 && startcode <= 0x9f)) {
+ } else if ((startcode >= 0x88 && startcode <= 0x8f) ||
+ (startcode >= 0x98 && startcode <= 0x9f)) {
/* 0x90 - 0x97 is reserved for SDDS in DVD specs */
- type = AVMEDIA_TYPE_AUDIO;
+ type = AVMEDIA_TYPE_AUDIO;
codec_id = AV_CODEC_ID_DTS;
} else if (startcode >= 0xa0 && startcode <= 0xaf) {
- type = AVMEDIA_TYPE_AUDIO;
+ type = AVMEDIA_TYPE_AUDIO;
codec_id = AV_CODEC_ID_PCM_DVD;
} else if (startcode >= 0xb0 && startcode <= 0xbf) {
- type = AVMEDIA_TYPE_AUDIO;
+ type = AVMEDIA_TYPE_AUDIO;
codec_id = AV_CODEC_ID_TRUEHD;
} else if (startcode >= 0xc0 && startcode <= 0xcf) {
/* Used for both AC-3 and E-AC-3 in EVOB files */
- type = AVMEDIA_TYPE_AUDIO;
+ type = AVMEDIA_TYPE_AUDIO;
codec_id = AV_CODEC_ID_AC3;
} else if (startcode >= 0x20 && startcode <= 0x3f) {
- type = AVMEDIA_TYPE_SUBTITLE;
+ type = AVMEDIA_TYPE_SUBTITLE;
codec_id = AV_CODEC_ID_DVD_SUBTITLE;
} else if (startcode >= 0xfd55 && startcode <= 0xfd5f) {
- type = AVMEDIA_TYPE_VIDEO;
+ type = AVMEDIA_TYPE_VIDEO;
codec_id = AV_CODEC_ID_VC1;
} else if (startcode == 0x1bd) {
// check dvd audio substream type
type = AVMEDIA_TYPE_AUDIO;
- switch(dvdaudio_substream_type & 0xe0) {
- case 0xa0: codec_id = AV_CODEC_ID_PCM_DVD;
- break;
- case 0x80: if((dvdaudio_substream_type & 0xf8) == 0x88)
- codec_id = AV_CODEC_ID_DTS;
- else codec_id = AV_CODEC_ID_AC3;
- break;
- default: av_log(s, AV_LOG_ERROR, "Unknown 0x1bd sub-stream\n");
- goto skip;
+ switch (dvdaudio_substream_type & 0xe0) {
+ case 0xa0:
+ codec_id = AV_CODEC_ID_PCM_DVD;
+ break;
+ case 0x80:
+ if ((dvdaudio_substream_type & 0xf8) == 0x88)
+ codec_id = AV_CODEC_ID_DTS;
+ else
+ codec_id = AV_CODEC_ID_AC3;
+ break;
+ default:
+ av_log(s, AV_LOG_ERROR, "Unknown 0x1bd sub-stream\n");
+ goto skip;
}
} else {
- skip:
+skip:
/* skip packet */
avio_skip(s->pb, len);
goto redo;
@@ -490,17 +516,19 @@ static int mpegps_read_packet(AVFormatContext *s,
st = avformat_new_stream(s, NULL);
if (!st)
goto skip;
- st->id = startcode;
+ st->id = startcode;
st->codec->codec_type = type;
- st->codec->codec_id = codec_id;
- st->need_parsing = AVSTREAM_PARSE_FULL;
- found:
- if(st->discard >= AVDISCARD_ALL)
+ st->codec->codec_id = codec_id;
+ st->need_parsing = AVSTREAM_PARSE_FULL;
+
+found:
+ if (st->discard >= AVDISCARD_ALL)
goto skip;
ret = av_get_packet(s->pb, pkt, len);
- pkt->pts = pts;
- pkt->dts = dts;
- pkt->pos = dummy_pos;
+
+ pkt->pts = pts;
+ pkt->dts = dts;
+ pkt->pos = dummy_pos;
pkt->stream_index = st->index;
av_dlog(s, "%d: pts=%0.3f dts=%0.3f size=%d\n",
pkt->stream_index, pkt->pts / 90000.0, pkt->dts / 90000.0,
@@ -519,7 +547,7 @@ static int64_t mpegps_read_dts(AVFormatContext *s, int stream_index,
if (avio_seek(s->pb, pos, SEEK_SET) < 0)
return AV_NOPTS_VALUE;
- for(;;) {
+ for (;;) {
len = mpegps_read_pes_header(s, &pos, &startcode, &pts, &dts);
if (len < 0) {
av_dlog(s, "none (ret=%d)\n", len);
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