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ffmpeg.wasm-core
Commit 5b8f0a5e authored by Tanja Batchelor's avatar Tanja Batchelor Committed by Vittorio Giovara
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mpeg: K&R formatting cosmetics 

Signed-off-by: 's avatarVittorio Giovara <vittorio.giovara@gmail.com>
parent f51d0f39
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Showing with 169 additions and 141 deletions
libavformat/mpeg.c
View file @ 5b8f0a5e
......@@ -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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