| /* |
| * MPEG1/2 demuxer |
| * Copyright (c) 2000, 2001, 2002 Fabrice Bellard |
| * |
| * This file is part of FFmpeg. |
| * |
| * FFmpeg is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU Lesser General Public |
| * License as published by the Free Software Foundation; either |
| * version 2.1 of the License, or (at your option) any later version. |
| * |
| * FFmpeg is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * Lesser General Public License for more details. |
| * |
| * You should have received a copy of the GNU Lesser General Public |
| * License along with FFmpeg; if not, write to the Free Software |
| * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| */ |
| |
| #include "avformat.h" |
| #include "internal.h" |
| #include "mpeg.h" |
| |
| #if CONFIG_VOBSUB_DEMUXER |
| # include "subtitles.h" |
| # include "libavutil/bprint.h" |
| # include "libavutil/opt.h" |
| #endif |
| |
| #include "libavutil/avassert.h" |
| |
| /*********************************************/ |
| /* demux code */ |
| |
| #define MAX_SYNC_SIZE 100000 |
| |
| static int check_pes(const uint8_t *p, const 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 |
| pes1 = *p == 0x0F; |
| |
| return pes1 || pes2; |
| } |
| |
| 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 i; |
| int sys = 0, pspack = 0, priv1 = 0, vid = 0; |
| int audio = 0, invalid = 0, score = 0; |
| int endpes = 0; |
| |
| 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 = endpes <= i && 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) { |
| endpes = i + len; |
| 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 == 0x1fd && pes) vid++; //VC1 |
| |
| 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 + 1) /* invalid VDR files nd short PES streams */ |
| score = AVPROBE_SCORE_EXTENSION / 2; |
| |
| // av_log(NULL, AV_LOG_ERROR, "vid:%d aud:%d sys:%d pspack:%d invalid:%d size:%d \n", |
| // vid, audio, sys, pspack, invalid, p->buf_size); |
| |
| if (sys > invalid && sys * 9 <= pspack * 10) |
| return (audio > 12 || vid > 3 || pspack > 2) ? AVPROBE_SCORE_EXTENSION + 2 |
| : AVPROBE_SCORE_EXTENSION / 2 + 1; // 1 more than mp3 |
| 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 + 2 * invalid) ? 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 |
| // Have\ Yourself\ a\ Merry\ Little\ Christmas.mp3 0 0 0 5 0 1 len:21618 |
| return score; |
| } |
| |
| typedef struct MpegDemuxContext { |
| AVClass *class; |
| int32_t header_state; |
| unsigned char psm_es_type[256]; |
| int sofdec; |
| int dvd; |
| int imkh_cctv; |
| #if CONFIG_VOBSUB_DEMUXER |
| AVFormatContext *sub_ctx; |
| FFDemuxSubtitlesQueue q[32]; |
| char *sub_name; |
| #endif |
| } MpegDemuxContext; |
| |
| static int mpegps_read_header(AVFormatContext *s) |
| { |
| MpegDemuxContext *m = s->priv_data; |
| char buffer[7]; |
| int64_t last_pos = avio_tell(s->pb); |
| |
| m->header_state = 0xff; |
| s->ctx_flags |= AVFMTCTX_NOHEADER; |
| |
| avio_get_str(s->pb, 6, buffer, sizeof(buffer)); |
| if (!memcmp("IMKH", buffer, 4)) { |
| m->imkh_cctv = 1; |
| } else if (!memcmp("Sofdec", buffer, 6)) { |
| m->sofdec = 1; |
| } else |
| avio_seek(s->pb, last_pos, SEEK_SET); |
| |
| /* no need to do more */ |
| return 0; |
| } |
| |
| 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); |
| |
| return ff_parse_pes_pts(buf); |
| } |
| |
| static int find_next_start_code(AVIOContext *pb, int *size_ptr, |
| int32_t *header_state) |
| { |
| unsigned int state, v; |
| int val, n; |
| |
| state = *header_state; |
| n = *size_ptr; |
| while (n > 0) { |
| if (avio_feof(pb)) |
| break; |
| v = avio_r8(pb); |
| n--; |
| if (state == 0x000001) { |
| state = ((state << 8) | v) & 0xffffff; |
| val = state; |
| goto found; |
| } |
| state = ((state << 8) | v) & 0xffffff; |
| } |
| val = -1; |
| |
| found: |
| *header_state = state; |
| *size_ptr = n; |
| return val; |
| } |
| |
| /** |
| * Extract stream types from a program stream map |
| * According to ISO/IEC 13818-1 ('MPEG-2 Systems') table 2-35 |
| * |
| * @return number of bytes occupied by PSM in the bitstream |
| */ |
| static long mpegps_psm_parse(MpegDemuxContext *m, AVIOContext *pb) |
| { |
| int psm_length, ps_info_length, es_map_length; |
| |
| psm_length = avio_rb16(pb); |
| avio_r8(pb); |
| avio_r8(pb); |
| ps_info_length = avio_rb16(pb); |
| |
| /* skip program_stream_info */ |
| avio_skip(pb, ps_info_length); |
| /*es_map_length = */avio_rb16(pb); |
| /* Ignore es_map_length, trust psm_length */ |
| es_map_length = psm_length - ps_info_length - 10; |
| |
| /* at least one es available? */ |
| 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 */ |
| avio_skip(pb, es_info_length); |
| es_map_length -= 4 + es_info_length; |
| } |
| avio_rb32(pb); /* crc32 */ |
| return 2 + psm_length; |
| } |
| |
| /* read the next PES header. Return its position in ppos |
| * (if not NULL), and its start code, pts and dts. |
| */ |
| static int mpegps_read_pes_header(AVFormatContext *s, |
| int64_t *ppos, int *pstart_code, |
| int64_t *ppts, int64_t *pdts) |
| { |
| MpegDemuxContext *m = s->priv_data; |
| 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 (avio_feof(s->pb)) |
| return AVERROR_EOF; |
| // FIXME we should remember header_state |
| return FFERROR_REDO; |
| } |
| |
| if (startcode == PACK_START_CODE) |
| goto redo; |
| if (startcode == SYSTEM_HEADER_START_CODE) |
| goto redo; |
| if (startcode == PADDING_STREAM) { |
| avio_skip(s->pb, avio_rb16(s->pb)); |
| goto redo; |
| } |
| if (startcode == PRIVATE_STREAM_2) { |
| if (!m->sofdec) { |
| /* Need to detect whether this from a DVD or a 'Sofdec' stream */ |
| int len = avio_rb16(s->pb); |
| int bytesread = 0; |
| uint8_t *ps2buf = av_malloc(len); |
| |
| if (ps2buf) { |
| bytesread = avio_read(s->pb, ps2buf, len); |
| |
| if (bytesread != len) { |
| avio_skip(s->pb, len - bytesread); |
| } else { |
| uint8_t *p = 0; |
| if (len >= 6) |
| p = memchr(ps2buf, 'S', len - 5); |
| |
| if (p) |
| m->sofdec = !memcmp(p+1, "ofdec", 5); |
| |
| m->sofdec -= !m->sofdec; |
| |
| if (m->sofdec < 0) { |
| if (len == 980 && ps2buf[0] == 0) { |
| /* PCI structure? */ |
| uint32_t startpts = AV_RB32(ps2buf + 0x0d); |
| uint32_t endpts = AV_RB32(ps2buf + 0x11); |
| uint8_t hours = ((ps2buf[0x19] >> 4) * 10) + (ps2buf[0x19] & 0x0f); |
| uint8_t mins = ((ps2buf[0x1a] >> 4) * 10) + (ps2buf[0x1a] & 0x0f); |
| uint8_t secs = ((ps2buf[0x1b] >> 4) * 10) + (ps2buf[0x1b] & 0x0f); |
| |
| m->dvd = (hours <= 23 && |
| mins <= 59 && |
| secs <= 59 && |
| (ps2buf[0x19] & 0x0f) < 10 && |
| (ps2buf[0x1a] & 0x0f) < 10 && |
| (ps2buf[0x1b] & 0x0f) < 10 && |
| endpts >= startpts); |
| } else if (len == 1018 && ps2buf[0] == 1) { |
| /* DSI structure? */ |
| uint8_t hours = ((ps2buf[0x1d] >> 4) * 10) + (ps2buf[0x1d] & 0x0f); |
| uint8_t mins = ((ps2buf[0x1e] >> 4) * 10) + (ps2buf[0x1e] & 0x0f); |
| uint8_t secs = ((ps2buf[0x1f] >> 4) * 10) + (ps2buf[0x1f] & 0x0f); |
| |
| m->dvd = (hours <= 23 && |
| mins <= 59 && |
| secs <= 59 && |
| (ps2buf[0x1d] & 0x0f) < 10 && |
| (ps2buf[0x1e] & 0x0f) < 10 && |
| (ps2buf[0x1f] & 0x0f) < 10); |
| } |
| } |
| } |
| |
| av_free(ps2buf); |
| |
| /* If this isn't a DVD packet or no memory |
| * could be allocated, just ignore it. |
| * If we did, move back to the start of the |
| * packet (plus 'length' field) */ |
| if (!m->dvd || avio_skip(s->pb, -(len + 2)) < 0) { |
| /* Skip back failed. |
| * This packet will be lost but that can't be helped |
| * if we can't skip back |
| */ |
| goto redo; |
| } |
| } else { |
| /* No memory */ |
| avio_skip(s->pb, len); |
| goto redo; |
| } |
| } else if (!m->dvd) { |
| int len = avio_rb16(s->pb); |
| avio_skip(s->pb, len); |
| goto redo; |
| } |
| } |
| if (startcode == PROGRAM_STREAM_MAP) { |
| mpegps_psm_parse(m, s->pb); |
| goto redo; |
| } |
| |
| /* find matching stream */ |
| if (!((startcode >= 0x1c0 && startcode <= 0x1df) || |
| (startcode >= 0x1e0 && startcode <= 0x1ef) || |
| (startcode == 0x1bd) || |
| (startcode == PRIVATE_STREAM_2) || |
| (startcode == 0x1fd))) |
| goto redo; |
| if (ppos) { |
| *ppos = avio_tell(s->pb) - 4; |
| } |
| len = avio_rb16(s->pb); |
| pts = |
| dts = AV_NOPTS_VALUE; |
| if (startcode != PRIVATE_STREAM_2) |
| { |
| /* stuffing */ |
| for (;;) { |
| if (len < 1) |
| goto error_redo; |
| c = avio_r8(s->pb); |
| len--; |
| /* XXX: for mpeg1, should test only bit 7 */ |
| if (c != 0xff) |
| break; |
| } |
| if ((c & 0xc0) == 0x40) { |
| /* buffer scale & size */ |
| avio_r8(s->pb); |
| c = avio_r8(s->pb); |
| len -= 2; |
| } |
| if ((c & 0xe0) == 0x20) { |
| dts = |
| pts = get_pts(s->pb, c); |
| len -= 4; |
| if (c & 0x10) { |
| dts = get_pts(s->pb, -1); |
| len -= 5; |
| } |
| } else if ((c & 0xc0) == 0x80) { |
| /* mpeg 2 PES */ |
| flags = avio_r8(s->pb); |
| header_len = avio_r8(s->pb); |
| len -= 2; |
| if (header_len > len) |
| goto error_redo; |
| len -= header_len; |
| if (flags & 0x80) { |
| dts = pts = get_pts(s->pb, -1); |
| header_len -= 5; |
| if (flags & 0x40) { |
| dts = get_pts(s->pb, -1); |
| header_len -= 5; |
| } |
| } |
| 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 += skip & 0x9; |
| 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; |
| } |
| avio_skip(s->pb, skip); |
| header_len -= skip; |
| |
| if (pes_ext & 0x01) { /* PES extension 2 */ |
| ext2_len = avio_r8(s->pb); |
| header_len--; |
| if ((ext2_len & 0x7f) > 0) { |
| id_ext = avio_r8(s->pb); |
| if ((id_ext & 0x80) == 0) |
| startcode = ((startcode & 0xff) << 8) | id_ext; |
| header_len--; |
| } |
| } |
| } |
| if (header_len < 0) |
| goto error_redo; |
| avio_skip(s->pb, header_len); |
| } else if (c != 0xf) |
| goto redo; |
| } |
| |
| if (startcode == PRIVATE_STREAM_1) { |
| startcode = avio_r8(s->pb); |
| len--; |
| } |
| if (len < 0) |
| goto error_redo; |
| 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 */) { |
| ff_reduce_index(s, i); |
| av_add_index_entry(s->streams[i], *ppos, dts, 0, 0, |
| AVINDEX_KEYFRAME /* FIXME keyframe? */); |
| } |
| } |
| } |
| |
| *pstart_code = startcode; |
| *ppts = pts; |
| *pdts = dts; |
| return len; |
| } |
| |
| static int mpegps_read_packet(AVFormatContext *s, |
| AVPacket *pkt) |
| { |
| MpegDemuxContext *m = s->priv_data; |
| AVStream *st; |
| int len, startcode, i, es_type, ret; |
| int lpcm_header_len = -1; //Init to suppress warning |
| int request_probe= 0; |
| 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 |
| |
| redo: |
| len = mpegps_read_pes_header(s, &dummy_pos, &startcode, &pts, &dts); |
| if (len < 0) |
| return len; |
| |
| if (startcode >= 0x80 && startcode <= 0xcf) { |
| if (len < 4) |
| goto skip; |
| |
| /* audio: skip header */ |
| avio_r8(s->pb); |
| lpcm_header_len = avio_rb16(s->pb); |
| len -= 3; |
| if (startcode >= 0xb0 && startcode <= 0xbf) { |
| /* MLP/TrueHD audio has a 4-byte header */ |
| avio_r8(s->pb); |
| len--; |
| } |
| } |
| |
| /* now find stream */ |
| 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 == STREAM_TYPE_VIDEO_MPEG1) { |
| codec_id = AV_CODEC_ID_MPEG2VIDEO; |
| 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) { |
| codec_id = AV_CODEC_ID_MP3; |
| 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) { |
| codec_id = AV_CODEC_ID_MPEG4; |
| 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) { |
| codec_id = AV_CODEC_ID_AC3; |
| type = AVMEDIA_TYPE_AUDIO; |
| } else if (m->imkh_cctv && es_type == 0x91) { |
| codec_id = AV_CODEC_ID_PCM_MULAW; |
| type = AVMEDIA_TYPE_AUDIO; |
| } 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)) |
| codec_id = AV_CODEC_ID_CAVS; |
| else |
| request_probe= 1; |
| type = AVMEDIA_TYPE_VIDEO; |
| } else if (startcode == PRIVATE_STREAM_2) { |
| type = AVMEDIA_TYPE_DATA; |
| codec_id = AV_CODEC_ID_DVD_NAV; |
| } else if (startcode >= 0x1c0 && startcode <= 0x1df) { |
| type = AVMEDIA_TYPE_AUDIO; |
| if (m->sofdec > 0) { |
| codec_id = AV_CODEC_ID_ADPCM_ADX; |
| // Auto-detect AC-3 |
| request_probe = 50; |
| } else if (m->imkh_cctv && startcode == 0x1c0 && len > 80) { |
| codec_id = AV_CODEC_ID_PCM_ALAW; |
| request_probe = 50; |
| } else { |
| codec_id = AV_CODEC_ID_MP2; |
| if (m->imkh_cctv) |
| request_probe = 25; |
| } |
| } else if (startcode >= 0x80 && startcode <= 0x87) { |
| type = AVMEDIA_TYPE_AUDIO; |
| codec_id = AV_CODEC_ID_AC3; |
| } else if ((startcode >= 0x88 && startcode <= 0x8f) || |
| (startcode >= 0x98 && startcode <= 0x9f)) { |
| /* 0x90 - 0x97 is reserved for SDDS in DVD specs */ |
| type = AVMEDIA_TYPE_AUDIO; |
| codec_id = AV_CODEC_ID_DTS; |
| } else if (startcode >= 0xa0 && startcode <= 0xaf) { |
| type = AVMEDIA_TYPE_AUDIO; |
| if (lpcm_header_len == 6) { |
| codec_id = AV_CODEC_ID_MLP; |
| } else { |
| codec_id = AV_CODEC_ID_PCM_DVD; |
| } |
| } else if (startcode >= 0xb0 && startcode <= 0xbf) { |
| 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; |
| codec_id = AV_CODEC_ID_AC3; |
| } else if (startcode >= 0x20 && startcode <= 0x3f) { |
| type = AVMEDIA_TYPE_SUBTITLE; |
| codec_id = AV_CODEC_ID_DVD_SUBTITLE; |
| } else if (startcode >= 0xfd55 && startcode <= 0xfd5f) { |
| type = AVMEDIA_TYPE_VIDEO; |
| codec_id = AV_CODEC_ID_VC1; |
| } else { |
| skip: |
| /* skip packet */ |
| avio_skip(s->pb, len); |
| goto redo; |
| } |
| /* no stream found: add a new stream */ |
| st = avformat_new_stream(s, NULL); |
| if (!st) |
| goto skip; |
| st->id = startcode; |
| st->codec->codec_type = type; |
| st->codec->codec_id = codec_id; |
| if ( st->codec->codec_id == AV_CODEC_ID_PCM_MULAW |
| || st->codec->codec_id == AV_CODEC_ID_PCM_ALAW) { |
| st->codec->channels = 1; |
| st->codec->channel_layout = AV_CH_LAYOUT_MONO; |
| st->codec->sample_rate = 8000; |
| } |
| st->request_probe = request_probe; |
| st->need_parsing = AVSTREAM_PARSE_FULL; |
| |
| found: |
| if (st->discard >= AVDISCARD_ALL) |
| goto skip; |
| if (startcode >= 0xa0 && startcode <= 0xaf) { |
| if (st->codec->codec_id == AV_CODEC_ID_MLP) { |
| if (len < 6) |
| goto skip; |
| avio_skip(s->pb, 6); |
| len -=6; |
| } |
| } |
| ret = av_get_packet(s->pb, pkt, len); |
| |
| pkt->pts = pts; |
| pkt->dts = dts; |
| pkt->pos = dummy_pos; |
| pkt->stream_index = st->index; |
| |
| if (s->debug & FF_FDEBUG_TS) |
| av_log(s, AV_LOG_TRACE, "%d: pts=%0.3f dts=%0.3f size=%d\n", |
| pkt->stream_index, pkt->pts / 90000.0, pkt->dts / 90000.0, |
| pkt->size); |
| |
| return (ret < 0) ? ret : 0; |
| } |
| |
| static int64_t mpegps_read_dts(AVFormatContext *s, int stream_index, |
| int64_t *ppos, int64_t pos_limit) |
| { |
| int len, startcode; |
| int64_t pos, pts, dts; |
| |
| pos = *ppos; |
| if (avio_seek(s->pb, pos, SEEK_SET) < 0) |
| return AV_NOPTS_VALUE; |
| |
| for (;;) { |
| len = mpegps_read_pes_header(s, &pos, &startcode, &pts, &dts); |
| if (len < 0) { |
| if (s->debug & FF_FDEBUG_TS) |
| av_log(s, AV_LOG_TRACE, "none (ret=%d)\n", len); |
| return AV_NOPTS_VALUE; |
| } |
| if (startcode == s->streams[stream_index]->id && |
| dts != AV_NOPTS_VALUE) { |
| break; |
| } |
| avio_skip(s->pb, len); |
| } |
| if (s->debug & FF_FDEBUG_TS) |
| av_log(s, AV_LOG_TRACE, "pos=0x%"PRIx64" dts=0x%"PRIx64" %0.3f\n", |
| pos, dts, dts / 90000.0); |
| *ppos = pos; |
| return dts; |
| } |
| |
| AVInputFormat ff_mpegps_demuxer = { |
| .name = "mpeg", |
| .long_name = NULL_IF_CONFIG_SMALL("MPEG-PS (MPEG-2 Program Stream)"), |
| .priv_data_size = sizeof(MpegDemuxContext), |
| .read_probe = mpegps_probe, |
| .read_header = mpegps_read_header, |
| .read_packet = mpegps_read_packet, |
| .read_timestamp = mpegps_read_dts, |
| .flags = AVFMT_SHOW_IDS | AVFMT_TS_DISCONT, |
| }; |
| |
| #if CONFIG_VOBSUB_DEMUXER |
| |
| #define REF_STRING "# VobSub index file," |
| #define MAX_LINE_SIZE 2048 |
| |
| static int vobsub_probe(AVProbeData *p) |
| { |
| if (!strncmp(p->buf, REF_STRING, sizeof(REF_STRING) - 1)) |
| return AVPROBE_SCORE_MAX; |
| return 0; |
| } |
| |
| static int vobsub_read_header(AVFormatContext *s) |
| { |
| int i, ret = 0, header_parsed = 0, langidx = 0; |
| MpegDemuxContext *vobsub = s->priv_data; |
| size_t fname_len; |
| char *header_str; |
| AVBPrint header; |
| int64_t delay = 0; |
| AVStream *st = NULL; |
| int stream_id = -1; |
| char id[64] = {0}; |
| char alt[MAX_LINE_SIZE] = {0}; |
| AVInputFormat *iformat; |
| |
| if (!vobsub->sub_name) { |
| char *ext; |
| vobsub->sub_name = av_strdup(s->filename); |
| if (!vobsub->sub_name) { |
| ret = AVERROR(ENOMEM); |
| goto end; |
| } |
| |
| fname_len = strlen(vobsub->sub_name); |
| ext = vobsub->sub_name - 3 + fname_len; |
| if (fname_len < 4 || *(ext - 1) != '.') { |
| av_log(s, AV_LOG_ERROR, "The input index filename is too short " |
| "to guess the associated .SUB file\n"); |
| ret = AVERROR_INVALIDDATA; |
| goto end; |
| } |
| memcpy(ext, !strncmp(ext, "IDX", 3) ? "SUB" : "sub", 3); |
| av_log(s, AV_LOG_VERBOSE, "IDX/SUB: %s -> %s\n", s->filename, vobsub->sub_name); |
| } |
| |
| if (!(iformat = av_find_input_format("mpeg"))) { |
| ret = AVERROR_DEMUXER_NOT_FOUND; |
| goto end; |
| } |
| |
| vobsub->sub_ctx = avformat_alloc_context(); |
| if (!vobsub->sub_ctx) { |
| ret = AVERROR(ENOMEM); |
| goto end; |
| } |
| |
| if ((ret = ff_copy_whitelists(vobsub->sub_ctx, s)) < 0) |
| goto end; |
| |
| ret = avformat_open_input(&vobsub->sub_ctx, vobsub->sub_name, iformat, NULL); |
| if (ret < 0) { |
| av_log(s, AV_LOG_ERROR, "Unable to open %s as MPEG subtitles\n", vobsub->sub_name); |
| goto end; |
| } |
| |
| av_bprint_init(&header, 0, AV_BPRINT_SIZE_UNLIMITED); |
| while (!avio_feof(s->pb)) { |
| char line[MAX_LINE_SIZE]; |
| int len = ff_get_line(s->pb, line, sizeof(line)); |
| |
| if (!len) |
| break; |
| |
| line[strcspn(line, "\r\n")] = 0; |
| |
| if (!strncmp(line, "id:", 3)) { |
| if (sscanf(line, "id: %63[^,], index: %u", id, &stream_id) != 2) { |
| av_log(s, AV_LOG_WARNING, "Unable to parse index line '%s', " |
| "assuming 'id: und, index: 0'\n", line); |
| strcpy(id, "und"); |
| stream_id = 0; |
| } |
| |
| if (stream_id >= FF_ARRAY_ELEMS(vobsub->q)) { |
| av_log(s, AV_LOG_ERROR, "Maximum number of subtitles streams reached\n"); |
| ret = AVERROR(EINVAL); |
| goto end; |
| } |
| |
| header_parsed = 1; |
| alt[0] = '\0'; |
| /* We do not create the stream immediately to avoid adding empty |
| * streams. See the following timestamp entry. */ |
| |
| av_log(s, AV_LOG_DEBUG, "IDX stream[%d] id=%s\n", stream_id, id); |
| |
| } else if (!strncmp(line, "timestamp:", 10)) { |
| AVPacket *sub; |
| int hh, mm, ss, ms; |
| int64_t pos, timestamp; |
| const char *p = line + 10; |
| |
| if (stream_id == -1) { |
| av_log(s, AV_LOG_ERROR, "Timestamp declared before any stream\n"); |
| ret = AVERROR_INVALIDDATA; |
| goto end; |
| } |
| |
| if (!st || st->id != stream_id) { |
| st = avformat_new_stream(s, NULL); |
| if (!st) { |
| ret = AVERROR(ENOMEM); |
| goto end; |
| } |
| st->id = stream_id; |
| st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE; |
| st->codec->codec_id = AV_CODEC_ID_DVD_SUBTITLE; |
| avpriv_set_pts_info(st, 64, 1, 1000); |
| av_dict_set(&st->metadata, "language", id, 0); |
| if (alt[0]) |
| av_dict_set(&st->metadata, "title", alt, 0); |
| } |
| |
| if (sscanf(p, "%02d:%02d:%02d:%03d, filepos: %"SCNx64, |
| &hh, &mm, &ss, &ms, &pos) != 5) { |
| av_log(s, AV_LOG_ERROR, "Unable to parse timestamp line '%s', " |
| "abort parsing\n", line); |
| ret = AVERROR_INVALIDDATA; |
| goto end; |
| } |
| timestamp = (hh*3600LL + mm*60LL + ss) * 1000LL + ms + delay; |
| timestamp = av_rescale_q(timestamp, av_make_q(1, 1000), st->time_base); |
| |
| sub = ff_subtitles_queue_insert(&vobsub->q[s->nb_streams - 1], "", 0, 0); |
| if (!sub) { |
| ret = AVERROR(ENOMEM); |
| goto end; |
| } |
| sub->pos = pos; |
| sub->pts = timestamp; |
| sub->stream_index = s->nb_streams - 1; |
| |
| } else if (!strncmp(line, "alt:", 4)) { |
| const char *p = line + 4; |
| |
| while (*p == ' ') |
| p++; |
| av_log(s, AV_LOG_DEBUG, "IDX stream[%d] name=%s\n", stream_id, p); |
| av_strlcpy(alt, p, sizeof(alt)); |
| header_parsed = 1; |
| |
| } else if (!strncmp(line, "delay:", 6)) { |
| int sign = 1, hh = 0, mm = 0, ss = 0, ms = 0; |
| const char *p = line + 6; |
| |
| while (*p == ' ') |
| p++; |
| if (*p == '-' || *p == '+') { |
| sign = *p == '-' ? -1 : 1; |
| p++; |
| } |
| sscanf(p, "%d:%d:%d:%d", &hh, &mm, &ss, &ms); |
| delay = ((hh*3600LL + mm*60LL + ss) * 1000LL + ms) * sign; |
| |
| } else if (!strncmp(line, "langidx:", 8)) { |
| const char *p = line + 8; |
| |
| if (sscanf(p, "%d", &langidx) != 1) |
| av_log(s, AV_LOG_ERROR, "Invalid langidx specified\n"); |
| |
| } else if (!header_parsed) { |
| if (line[0] && line[0] != '#') |
| av_bprintf(&header, "%s\n", line); |
| } |
| } |
| |
| if (langidx < s->nb_streams) |
| s->streams[langidx]->disposition |= AV_DISPOSITION_DEFAULT; |
| |
| for (i = 0; i < s->nb_streams; i++) { |
| vobsub->q[i].sort = SUB_SORT_POS_TS; |
| vobsub->q[i].keep_duplicates = 1; |
| ff_subtitles_queue_finalize(s, &vobsub->q[i]); |
| } |
| |
| if (!av_bprint_is_complete(&header)) { |
| av_bprint_finalize(&header, NULL); |
| ret = AVERROR(ENOMEM); |
| goto end; |
| } |
| av_bprint_finalize(&header, &header_str); |
| for (i = 0; i < s->nb_streams; i++) { |
| AVStream *sub_st = s->streams[i]; |
| sub_st->codec->extradata = av_strdup(header_str); |
| sub_st->codec->extradata_size = header.len; |
| } |
| av_free(header_str); |
| |
| end: |
| return ret; |
| } |
| |
| static int vobsub_read_packet(AVFormatContext *s, AVPacket *pkt) |
| { |
| MpegDemuxContext *vobsub = s->priv_data; |
| FFDemuxSubtitlesQueue *q; |
| AVIOContext *pb = vobsub->sub_ctx->pb; |
| int ret, psize, total_read = 0, i; |
| AVPacket idx_pkt; |
| |
| int64_t min_ts = INT64_MAX; |
| int sid = 0; |
| for (i = 0; i < s->nb_streams; i++) { |
| FFDemuxSubtitlesQueue *tmpq = &vobsub->q[i]; |
| int64_t ts; |
| av_assert0(tmpq->nb_subs); |
| ts = tmpq->subs[tmpq->current_sub_idx].pts; |
| if (ts < min_ts) { |
| min_ts = ts; |
| sid = i; |
| } |
| } |
| q = &vobsub->q[sid]; |
| ret = ff_subtitles_queue_read_packet(q, &idx_pkt); |
| if (ret < 0) |
| return ret; |
| |
| /* compute maximum packet size using the next packet position. This is |
| * useful when the len in the header is non-sense */ |
| if (q->current_sub_idx < q->nb_subs) { |
| psize = q->subs[q->current_sub_idx].pos - idx_pkt.pos; |
| } else { |
| int64_t fsize = avio_size(pb); |
| psize = fsize < 0 ? 0xffff : fsize - idx_pkt.pos; |
| } |
| |
| avio_seek(pb, idx_pkt.pos, SEEK_SET); |
| |
| av_init_packet(pkt); |
| pkt->size = 0; |
| pkt->data = NULL; |
| |
| do { |
| int n, to_read, startcode; |
| int64_t pts, dts; |
| int64_t old_pos = avio_tell(pb), new_pos; |
| int pkt_size; |
| |
| ret = mpegps_read_pes_header(vobsub->sub_ctx, NULL, &startcode, &pts, &dts); |
| if (ret < 0) { |
| if (pkt->size) // raise packet even if incomplete |
| break; |
| goto fail; |
| } |
| to_read = ret & 0xffff; |
| new_pos = avio_tell(pb); |
| pkt_size = ret + (new_pos - old_pos); |
| |
| /* this prevents reads above the current packet */ |
| if (total_read + pkt_size > psize) |
| break; |
| total_read += pkt_size; |
| |
| /* the current chunk doesn't match the stream index (unlikely) */ |
| if ((startcode & 0x1f) != s->streams[idx_pkt.stream_index]->id) |
| break; |
| |
| ret = av_grow_packet(pkt, to_read); |
| if (ret < 0) |
| goto fail; |
| |
| n = avio_read(pb, pkt->data + (pkt->size - to_read), to_read); |
| if (n < to_read) |
| pkt->size -= to_read - n; |
| } while (total_read < psize); |
| |
| pkt->pts = pkt->dts = idx_pkt.pts; |
| pkt->pos = idx_pkt.pos; |
| pkt->stream_index = idx_pkt.stream_index; |
| |
| av_packet_unref(&idx_pkt); |
| return 0; |
| |
| fail: |
| av_packet_unref(pkt); |
| av_packet_unref(&idx_pkt); |
| return ret; |
| } |
| |
| static int vobsub_read_seek(AVFormatContext *s, int stream_index, |
| int64_t min_ts, int64_t ts, int64_t max_ts, int flags) |
| { |
| MpegDemuxContext *vobsub = s->priv_data; |
| |
| /* Rescale requested timestamps based on the first stream (timebase is the |
| * same for all subtitles stream within a .idx/.sub). Rescaling is done just |
| * like in avformat_seek_file(). */ |
| if (stream_index == -1 && s->nb_streams != 1) { |
| int i, ret = 0; |
| AVRational time_base = s->streams[0]->time_base; |
| ts = av_rescale_q(ts, AV_TIME_BASE_Q, time_base); |
| min_ts = av_rescale_rnd(min_ts, time_base.den, |
| time_base.num * (int64_t)AV_TIME_BASE, |
| AV_ROUND_UP | AV_ROUND_PASS_MINMAX); |
| max_ts = av_rescale_rnd(max_ts, time_base.den, |
| time_base.num * (int64_t)AV_TIME_BASE, |
| AV_ROUND_DOWN | AV_ROUND_PASS_MINMAX); |
| for (i = 0; i < s->nb_streams; i++) { |
| int r = ff_subtitles_queue_seek(&vobsub->q[i], s, stream_index, |
| min_ts, ts, max_ts, flags); |
| if (r < 0) |
| ret = r; |
| } |
| return ret; |
| } |
| |
| if (stream_index == -1) // only 1 stream |
| stream_index = 0; |
| return ff_subtitles_queue_seek(&vobsub->q[stream_index], s, stream_index, |
| min_ts, ts, max_ts, flags); |
| } |
| |
| static int vobsub_read_close(AVFormatContext *s) |
| { |
| int i; |
| MpegDemuxContext *vobsub = s->priv_data; |
| |
| for (i = 0; i < s->nb_streams; i++) |
| ff_subtitles_queue_clean(&vobsub->q[i]); |
| if (vobsub->sub_ctx) |
| avformat_close_input(&vobsub->sub_ctx); |
| return 0; |
| } |
| |
| static const AVOption options[] = { |
| { "sub_name", "URI for .sub file", offsetof(MpegDemuxContext, sub_name), AV_OPT_TYPE_STRING, { .str = NULL }, 0, 0, AV_OPT_FLAG_DECODING_PARAM }, |
| { NULL } |
| }; |
| |
| static const AVClass vobsub_demuxer_class = { |
| .class_name = "vobsub", |
| .item_name = av_default_item_name, |
| .option = options, |
| .version = LIBAVUTIL_VERSION_INT, |
| }; |
| |
| AVInputFormat ff_vobsub_demuxer = { |
| .name = "vobsub", |
| .long_name = NULL_IF_CONFIG_SMALL("VobSub subtitle format"), |
| .priv_data_size = sizeof(MpegDemuxContext), |
| .read_probe = vobsub_probe, |
| .read_header = vobsub_read_header, |
| .read_packet = vobsub_read_packet, |
| .read_seek2 = vobsub_read_seek, |
| .read_close = vobsub_read_close, |
| .flags = AVFMT_SHOW_IDS, |
| .extensions = "idx", |
| .priv_class = &vobsub_demuxer_class, |
| }; |
| #endif |
