| /* | |
| * MPEG-1/2 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 "config_components.h" | |
| #include "libavutil/channel_layout.h" | |
| #include "avformat.h" | |
| #include "avio_internal.h" | |
| #include "demux.h" | |
| #include "internal.h" | |
| #include "mpeg.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(const 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 (len > INT_MAX - i) | |
| break; | |
| 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 + (audio + vid + pspack > 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 > 6 + 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 { | |
| int32_t header_state; | |
| unsigned char psm_es_type[256]; | |
| int sofdec; | |
| int dvd; | |
| int imkh_cctv; | |
| int raw_ac3; | |
| } MpegDemuxContext; | |
| static int mpegps_read_header(AVFormatContext *s) | |
| { | |
| MpegDemuxContext *m = s->priv_data; | |
| char buffer[7] = { 0 }; | |
| 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]; | |
| int ret; | |
| buf[0] = c < 0 ? avio_r8(pb) : c; | |
| ret = avio_read(pb, buf + 1, 4); | |
| if (ret < 4) | |
| return AV_NOPTS_VALUE; | |
| 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 MPEG-1, 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) { | |
| int ret = ffio_ensure_seekback(s->pb, 2); | |
| if (ret < 0) | |
| return ret; | |
| startcode = avio_r8(s->pb); | |
| m->raw_ac3 = 0; | |
| if (startcode == 0x0b) { | |
| if (avio_r8(s->pb) == 0x77) { | |
| startcode = 0x80; | |
| m->raw_ac3 = 1; | |
| avio_skip(s->pb, -2); | |
| } else { | |
| avio_skip(s->pb, -1); | |
| } | |
| } else { | |
| 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 & AVIO_SEEKABLE_NORMAL) /* 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; | |
| FFStream *sti; | |
| int len, startcode, i, es_type, ret; | |
| int pcm_dvd = 0; | |
| 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; | |
| if (!m->raw_ac3) { | |
| /* audio: skip header */ | |
| avio_skip(s->pb, 3); | |
| len -= 3; | |
| if (startcode >= 0xb0 && startcode <= 0xbf) { | |
| /* MLP/TrueHD audio has a 4-byte header */ | |
| avio_r8(s->pb); | |
| len--; | |
| } else if (startcode >= 0xa0 && startcode <= 0xaf) { | |
| ret = ffio_ensure_seekback(s->pb, 3); | |
| if (ret < 0) | |
| return ret; | |
| pcm_dvd = (avio_rb24(s->pb) & 0xFF) == 0x80; | |
| avio_skip(s->pb, -3); | |
| } | |
| } | |
| } | |
| /* 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_VIDEO_HEVC) { | |
| codec_id = AV_CODEC_ID_HEVC; | |
| type = AVMEDIA_TYPE_VIDEO; | |
| } else if (es_type == STREAM_TYPE_VIDEO_VVC) { | |
| codec_id = AV_CODEC_ID_VVC; | |
| type = AVMEDIA_TYPE_VIDEO; | |
| } else if (es_type == STREAM_TYPE_AUDIO_AC3) { | |
| codec_id = AV_CODEC_ID_AC3; | |
| type = AVMEDIA_TYPE_AUDIO; | |
| } else if (es_type == 0x90) { | |
| codec_id = AV_CODEC_ID_PCM_ALAW; | |
| 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]; | |
| ret = avio_read(s->pb, buf, 8); | |
| if (ret != 8) | |
| return AVERROR_INVALIDDATA; | |
| 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 (!pcm_dvd) { | |
| 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; | |
| sti = ffstream(st); | |
| st->id = startcode; | |
| st->codecpar->codec_type = type; | |
| st->codecpar->codec_id = codec_id; | |
| if ( st->codecpar->codec_id == AV_CODEC_ID_PCM_MULAW | |
| || st->codecpar->codec_id == AV_CODEC_ID_PCM_ALAW) { | |
| st->codecpar->ch_layout = (AVChannelLayout)AV_CHANNEL_LAYOUT_MONO; | |
| st->codecpar->sample_rate = 8000; | |
| } | |
| sti->request_probe = request_probe; | |
| sti->need_parsing = AVSTREAM_PARSE_FULL; | |
| found: | |
| if (st->discard >= AVDISCARD_ALL) | |
| goto skip; | |
| if (startcode >= 0xa0 && startcode <= 0xaf) { | |
| if (st->codecpar->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_DEBUG, "%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_DEBUG, "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_DEBUG, "pos=0x%"PRIx64" dts=0x%"PRIx64" %0.3f\n", | |
| pos, dts, dts / 90000.0); | |
| *ppos = pos; | |
| return dts; | |
| } | |
| const FFInputFormat ff_mpegps_demuxer = { | |
| .p.name = "mpeg", | |
| .p.long_name = NULL_IF_CONFIG_SMALL("MPEG-PS (MPEG-2 Program Stream)"), | |
| .p.flags = AVFMT_SHOW_IDS | AVFMT_TS_DISCONT, | |
| .priv_data_size = sizeof(MpegDemuxContext), | |
| .read_probe = mpegps_probe, | |
| .read_header = mpegps_read_header, | |
| .read_packet = mpegps_read_packet, | |
| .read_timestamp = mpegps_read_dts, | |
| }; | |
| #if CONFIG_VOBSUB_DEMUXER | |
| #include "subtitles.h" | |
| #include "libavutil/avassert.h" | |
| #include "libavutil/bprint.h" | |
| #include "libavutil/opt.h" | |
| #define REF_STRING "# VobSub index file," | |
| #define MAX_LINE_SIZE 2048 | |
| typedef struct VobSubDemuxContext { | |
| const AVClass *class; | |
| AVFormatContext *sub_ctx; | |
| FFDemuxSubtitlesQueue q[32]; | |
| char *sub_name; | |
| } VobSubDemuxContext; | |
| static int vobsub_probe(const AVProbeData *p) | |
| { | |
| if (!strncmp(p->buf, REF_STRING, sizeof(REF_STRING) - 1)) | |
| return AVPROBE_SCORE_MAX; | |
| return 0; | |
| } | |
| static int vobsub_read_close(AVFormatContext *s) | |
| { | |
| VobSubDemuxContext *vobsub = s->priv_data; | |
| int i; | |
| for (i = 0; i < s->nb_streams; i++) | |
| ff_subtitles_queue_clean(&vobsub->q[i]); | |
| avformat_close_input(&vobsub->sub_ctx); | |
| return 0; | |
| } | |
| static int vobsub_read_header(AVFormatContext *s) | |
| { | |
| int i, ret = 0, header_parsed = 0, langidx = 0; | |
| VobSubDemuxContext *vobsub = s->priv_data; | |
| const AVInputFormat *iformat; | |
| size_t fname_len; | |
| AVBPrint header; | |
| int64_t delay = 0; | |
| AVStream *st = NULL; | |
| int stream_id = -1; | |
| char id[64] = {0}; | |
| char alt[MAX_LINE_SIZE] = {0}; | |
| if (!vobsub->sub_name) { | |
| char *ext; | |
| vobsub->sub_name = av_strdup(s->url); | |
| if (!vobsub->sub_name) { | |
| return AVERROR(ENOMEM); | |
| } | |
| 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"); | |
| return AVERROR_INVALIDDATA; | |
| } | |
| memcpy(ext, !strncmp(ext, "IDX", 3) ? "SUB" : "sub", 3); | |
| av_log(s, AV_LOG_VERBOSE, "IDX/SUB: %s -> %s\n", s->url, vobsub->sub_name); | |
| } | |
| if (!(iformat = av_find_input_format("mpeg"))) { | |
| return AVERROR_DEMUXER_NOT_FOUND; | |
| } | |
| vobsub->sub_ctx = avformat_alloc_context(); | |
| if (!vobsub->sub_ctx) { | |
| return AVERROR(ENOMEM); | |
| } | |
| if ((ret = ff_copy_whiteblacklists(vobsub->sub_ctx, s)) < 0) | |
| return ret; | |
| 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); | |
| return ret; | |
| } | |
| av_bprint_init(&header, 0, INT_MAX - AV_INPUT_BUFFER_PADDING_SIZE); | |
| 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->codecpar->codec_type = AVMEDIA_TYPE_SUBTITLE; | |
| st->codecpar->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)) { | |
| ret = AVERROR(ENOMEM); | |
| goto end; | |
| } | |
| for (i = 0; i < s->nb_streams; i++) { | |
| AVCodecParameters *par = s->streams[i]->codecpar; | |
| ret = ff_alloc_extradata(par, header.len); | |
| if (ret < 0) { | |
| goto end; | |
| } | |
| memcpy(par->extradata, header.str, header.len); | |
| } | |
| end: | |
| av_bprint_finalize(&header, NULL); | |
| return ret; | |
| } | |
| static int vobsub_read_packet(AVFormatContext *s, AVPacket *pkt) | |
| { | |
| VobSubDemuxContext *vobsub = s->priv_data; | |
| FFDemuxSubtitlesQueue *q; | |
| AVIOContext *pb = vobsub->sub_ctx->pb; | |
| int ret, psize, total_read = 0, i; | |
| 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); | |
| if (tmpq->current_sub_idx >= tmpq->nb_subs) | |
| continue; | |
| ts = tmpq->subs[tmpq->current_sub_idx]->pts; | |
| if (ts < min_ts) { | |
| min_ts = ts; | |
| sid = i; | |
| } | |
| } | |
| q = &vobsub->q[sid]; | |
| /* The returned packet will have size zero, | |
| * so that it can be directly used with av_grow_packet. */ | |
| ret = ff_subtitles_queue_read_packet(q, 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 - pkt->pos; | |
| } else { | |
| int64_t fsize = avio_size(pb); | |
| psize = fsize < 0 ? 0xffff : fsize - pkt->pos; | |
| } | |
| avio_seek(pb, pkt->pos, SEEK_SET); | |
| 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; | |
| return ret; | |
| } | |
| 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[pkt->stream_index]->id) | |
| break; | |
| ret = av_grow_packet(pkt, to_read); | |
| if (ret < 0) | |
| return ret; | |
| 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); | |
| return 0; | |
| } | |
| static int vobsub_read_seek(AVFormatContext *s, int stream_index, | |
| int64_t min_ts, int64_t ts, int64_t max_ts, int flags) | |
| { | |
| VobSubDemuxContext *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 const AVOption options[] = { | |
| { "sub_name", "URI for .sub file", offsetof(VobSubDemuxContext, 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, | |
| }; | |
| const FFInputFormat ff_vobsub_demuxer = { | |
| .p.name = "vobsub", | |
| .p.long_name = NULL_IF_CONFIG_SMALL("VobSub subtitle format"), | |
| .p.flags = AVFMT_SHOW_IDS, | |
| .p.extensions = "idx", | |
| .p.priv_class = &vobsub_demuxer_class, | |
| .priv_data_size = sizeof(VobSubDemuxContext), | |
| .flags_internal = FF_INFMT_FLAG_INIT_CLEANUP, | |
| .read_probe = vobsub_probe, | |
| .read_header = vobsub_read_header, | |
| .read_packet = vobsub_read_packet, | |
| .read_seek2 = vobsub_read_seek, | |
| .read_close = vobsub_read_close, | |
| }; | |
| #endif |