From 5b8f0a5eac75d16376af60a6f6bb79b3e9e6dab7 Mon Sep 17 00:00:00 2001 From: Tanja Batchelor Date: Thu, 20 Mar 2014 01:02:42 +0000 Subject: mpeg: K&R formatting cosmetics Signed-off-by: Vittorio Giovara --- libavformat/mpeg.c | 310 +++++++++++++++++++++++++++++------------------------ 1 file changed, 169 insertions(+), 141 deletions(-) (limited to 'libavformat/mpeg.c') diff --git a/libavformat/mpeg.c b/libavformat/mpeg.c index 7430bb0113..7c87517a2f 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> 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; ibuf_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; inb_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;inb_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); -- cgit v1.2.3