diff options
Diffstat (limited to 'libavformat/mp3dec.c')
-rw-r--r-- | libavformat/mp3dec.c | 396 |
1 files changed, 267 insertions, 129 deletions
diff --git a/libavformat/mp3dec.c b/libavformat/mp3dec.c index e282218b8b..0924a57843 100644 --- a/libavformat/mp3dec.c +++ b/libavformat/mp3dec.c @@ -2,23 +2,24 @@ * MP3 demuxer * Copyright (c) 2003 Fabrice Bellard * - * This file is part of Libav. + * This file is part of FFmpeg. * - * Libav is free software; you can redistribute it and/or + * 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. * - * Libav is distributed in the hope that it will be useful, + * 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 Libav; if not, write to the Free Software + * License along with FFmpeg; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ +#include "libavutil/opt.h" #include "libavutil/avstring.h" #include "libavutil/intreadwrite.h" #include "libavutil/crc.h" @@ -41,21 +42,37 @@ #define XING_TOC_COUNT 100 -typedef struct MP3DecContext { +#define SAME_HEADER_MASK \ + (0xffe00000 | (3 << 17) | (3 << 10) | (3 << 19)) + +typedef struct { + AVClass *class; + int64_t filesize; int xing_toc; + int start_pad; + int end_pad; + int usetoc; unsigned frames; /* Total number of frames in file */ - unsigned size; /* Total number of bytes in the stream */ + unsigned header_filesize; /* Total number of bytes in the stream */ int is_cbr; } MP3DecContext; +enum CheckRet { + CHECK_WRONG_HEADER = -1, + CHECK_SEEK_FAILED = -2, +}; + +static int check(AVIOContext *pb, int64_t pos, uint32_t *header); + /* mp3 read */ static int mp3_read_probe(AVProbeData *p) { int max_frames, first_frames = 0; + int whole_used = 0; int frames, ret; uint32_t header; - uint8_t *buf, *buf0, *buf2, *end; + const uint8_t *buf, *buf0, *buf2, *end; buf0 = p->buf; end = p->buf + p->buf_size - sizeof(uint32_t); @@ -67,7 +84,6 @@ static int mp3_read_probe(AVProbeData *p) for(; buf < end; buf= buf2+1) { buf2 = buf; - for(frames = 0; buf2 < end; frames++) { MPADecodeHeader h; @@ -78,39 +94,22 @@ static int mp3_read_probe(AVProbeData *p) buf2 += h.frame_size; } max_frames = FFMAX(max_frames, frames); - if(buf == buf0) + if(buf == buf0) { first_frames= frames; + if (buf2 == end + sizeof(uint32_t)) + whole_used = 1; + } } // keep this in sync with ac3 probe, both need to avoid // issues with MPEG-files! - if (first_frames >= 10) - return AVPROBE_SCORE_EXTENSION + 5; - if (first_frames >= 4) - return AVPROBE_SCORE_EXTENSION + 1; - - if (max_frames) { - int pes = 0, i; - unsigned int code = -1; - -#define VIDEO_ID 0x000001e0 -#define AUDIO_ID 0x000001c0 - /* do a search for mpegps headers to be able to properly bias - * towards mpegps if we detect this stream as both. */ - for (i = 0; i<p->buf_size; i++) { - code = (code << 8) + p->buf[i]; - if ((code & 0xffffff00) == 0x100) { - if ((code & 0x1f0) == VIDEO_ID) pes++; - else if((code & 0x1e0) == AUDIO_ID) pes++; - } - } - - if (pes) - max_frames = (max_frames + pes - 1) / pes; - } - if (max_frames > 500) return AVPROBE_SCORE_EXTENSION; - else if (max_frames >= 4) return AVPROBE_SCORE_EXTENSION / 2; - else if (max_frames >= 1) return 1; - else return 0; + if (first_frames>=7) return AVPROBE_SCORE_EXTENSION + 1; + else if(max_frames>200)return AVPROBE_SCORE_EXTENSION; + else if(max_frames>=4 && max_frames >= p->buf_size/10000) return AVPROBE_SCORE_EXTENSION / 2; + else if(ff_id3v2_match(buf0, ID3v2_DEFAULT_MAGIC) && 2*ff_id3v2_tag_len(buf0) >= p->buf_size) + return p->buf_size < PROBE_BUF_MAX ? AVPROBE_SCORE_EXTENSION / 4 : AVPROBE_SCORE_EXTENSION - 2; + else if(first_frames > 1 && whole_used) return 5; + else if(max_frames>=1 && max_frames >= p->buf_size/10000) return 1; + else return 0; //mpegps_mp3_unrecognized_format.mpg has max_frames=3 } @@ -118,22 +117,25 @@ static void read_xing_toc(AVFormatContext *s, int64_t filesize, int64_t duration { int i; MP3DecContext *mp3 = s->priv_data; + int fast_seek = s->flags & AVFMT_FLAG_FAST_SEEK; + int fill_index = (mp3->usetoc || fast_seek) && duration > 0; if (!filesize && !(filesize = avio_size(s->pb))) { av_log(s, AV_LOG_WARNING, "Cannot determine file size, skipping TOC table.\n"); - return; + fill_index = 0; } for (i = 0; i < XING_TOC_COUNT; i++) { uint8_t b = avio_r8(s->pb); - - av_add_index_entry(s->streams[0], + if (fill_index) + av_add_index_entry(s->streams[0], av_rescale(b, filesize, 256), av_rescale(i, duration, XING_TOC_COUNT), 0, 0, AVINDEX_KEYFRAME); } - mp3->xing_toc = 1; + if (fill_index) + mp3->xing_toc = 1; } static void mp3_parse_info_tag(AVFormatContext *s, AVStream *st, @@ -143,7 +145,7 @@ static void mp3_parse_info_tag(AVFormatContext *s, AVStream *st, #define MIDDLE_BITS(k, m, n) LAST_BITS((k) >> (m), ((n) - (m))) uint16_t crc; - uint32_t v, delays; + uint32_t v; char version[10]; @@ -151,7 +153,9 @@ static void mp3_parse_info_tag(AVFormatContext *s, AVStream *st, int32_t r_gain = INT32_MIN, a_gain = INT32_MIN; MP3DecContext *mp3 = s->priv_data; - static const int64_t xing_offtbl[2][2] = { { 32, 17 }, { 17, 9 } }; + static const int64_t xing_offtbl[2][2] = {{32, 17}, {17,9}}; + uint64_t fsize = avio_size(s->pb); + fsize = fsize >= avio_tell(s->pb) ? fsize - avio_tell(s->pb) : 0; /* Check for Xing / Info tag */ avio_skip(s->pb, xing_offtbl[c->lsf == 1][c->nb_channels == 1]); @@ -164,12 +168,24 @@ static void mp3_parse_info_tag(AVFormatContext *s, AVStream *st, if (v & XING_FLAG_FRAMES) mp3->frames = avio_rb32(s->pb); if (v & XING_FLAG_SIZE) - mp3->size = avio_rb32(s->pb); - if (v & XING_FLAG_TOC && mp3->frames) - read_xing_toc(s, mp3->size, av_rescale_q(mp3->frames, + mp3->header_filesize = avio_rb32(s->pb); + if (fsize && mp3->header_filesize) { + uint64_t min, delta; + min = FFMIN(fsize, mp3->header_filesize); + delta = FFMAX(fsize, mp3->header_filesize) - min; + if (fsize > mp3->header_filesize && delta > min >> 4) { + mp3->frames = 0; + av_log(s, AV_LOG_WARNING, + "invalid concatenated file detected - using bitrate for duration\n"); + } else if (delta > min >> 4) { + av_log(s, AV_LOG_WARNING, + "filesize and duration do not match (growing file?)\n"); + } + } + if (v & XING_FLAG_TOC) + read_xing_toc(s, mp3->header_filesize, av_rescale_q(mp3->frames, (AVRational){spf, c->sample_rate}, st->time_base)); - /* VBR quality */ if (v & XING_FLAC_QSCALE) avio_rb32(s->pb); @@ -215,9 +231,25 @@ static void mp3_parse_info_tag(AVFormatContext *s, AVStream *st, avio_r8(s->pb); /* Encoder delays */ - delays = avio_rb24(s->pb); - st->codecpar->initial_padding = delays >> 12; - st->codecpar->trailing_padding = delays & ((1 << 12) - 1); + v= avio_rb24(s->pb); + if(AV_RB32(version) == MKBETAG('L', 'A', 'M', 'E') + || AV_RB32(version) == MKBETAG('L', 'a', 'v', 'f') + || AV_RB32(version) == MKBETAG('L', 'a', 'v', 'c') + ) { + + mp3->start_pad = v>>12; + mp3-> end_pad = v&4095; + st->start_skip_samples = mp3->start_pad + 528 + 1; + if (mp3->frames) { + st->first_discard_sample = -mp3->end_pad + 528 + 1 + mp3->frames * (int64_t)spf; + st->last_discard_sample = mp3->frames * (int64_t)spf; + } + if (!st->start_time) + st->start_time = av_rescale_q(st->start_skip_samples, + (AVRational){1, c->sample_rate}, + st->time_base); + av_log(s, AV_LOG_DEBUG, "pad %d %d\n", mp3->start_pad, mp3-> end_pad); + } /* Misc */ avio_r8(s->pb); @@ -257,7 +289,7 @@ static void mp3_parse_vbri_tag(AVFormatContext *s, AVStream *st, int64_t base) if (avio_rb16(s->pb) == 1) { /* skip delay and quality */ avio_skip(s->pb, 4); - mp3->size = avio_rb32(s->pb); + mp3->header_filesize = avio_rb32(s->pb); mp3->frames = avio_rb32(s->pb); } } @@ -289,12 +321,12 @@ static int mp3_parse_vbr_tags(AVFormatContext *s, AVStream *st, int64_t base) spf = c.lsf ? 576 : 1152; /* Samples per frame, layer 3 */ mp3->frames = 0; - mp3->size = 0; + mp3->header_filesize = 0; mp3_parse_info_tag(s, st, &c, spf); mp3_parse_vbri_tag(s, st, base); - if (!mp3->frames && !mp3->size) + if (!mp3->frames && !mp3->header_filesize) return -1; /* Skip the vbr tag frame */ @@ -303,17 +335,22 @@ static int mp3_parse_vbr_tags(AVFormatContext *s, AVStream *st, int64_t base) if (mp3->frames) st->duration = av_rescale_q(mp3->frames, (AVRational){spf, c.sample_rate}, st->time_base); - if (mp3->size && mp3->frames && !mp3->is_cbr) - st->codecpar->bit_rate = av_rescale(mp3->size, 8 * c.sample_rate, mp3->frames * (int64_t)spf); + if (mp3->header_filesize && mp3->frames && !mp3->is_cbr) + st->codecpar->bit_rate = av_rescale(mp3->header_filesize, 8 * c.sample_rate, mp3->frames * (int64_t)spf); return 0; } static int mp3_read_header(AVFormatContext *s) { + MP3DecContext *mp3 = s->priv_data; AVStream *st; int64_t off; int ret; + int i; + + s->metadata = s->internal->id3v2_meta; + s->internal->id3v2_meta = NULL; st = avformat_new_stream(s, NULL); if (!st) @@ -321,17 +358,21 @@ static int mp3_read_header(AVFormatContext *s) st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO; st->codecpar->codec_id = AV_CODEC_ID_MP3; - st->need_parsing = AVSTREAM_PARSE_FULL; + st->need_parsing = AVSTREAM_PARSE_FULL_RAW; st->start_time = 0; // lcm of all mp3 sample rates avpriv_set_pts_info(st, 64, 1, 14112000); + s->pb->maxsize = -1; off = avio_tell(s->pb); if (!av_dict_get(s->metadata, "", NULL, AV_DICT_IGNORE_SUFFIX)) ff_id3v1_read(s); + if(s->pb->seekable & AVIO_SEEKABLE_NORMAL) + mp3->filesize = avio_size(s->pb); + if (mp3_parse_vbr_tags(s, st, off) < 0) avio_seek(s->pb, off, SEEK_SET); @@ -339,6 +380,44 @@ static int mp3_read_header(AVFormatContext *s) if (ret < 0) return ret; + off = avio_tell(s->pb); + for (i = 0; i < 64 * 1024; i++) { + uint32_t header, header2; + int frame_size; + if (!(i&1023)) + ffio_ensure_seekback(s->pb, i + 1024 + 4); + frame_size = check(s->pb, off + i, &header); + if (frame_size > 0) { + ret = avio_seek(s->pb, off, SEEK_SET); + if (ret < 0) + return ret; + ffio_ensure_seekback(s->pb, i + 1024 + frame_size + 4); + ret = check(s->pb, off + i + frame_size, &header2); + if (ret >= 0 && + (header & SAME_HEADER_MASK) == (header2 & SAME_HEADER_MASK)) + { + av_log(s, i > 0 ? AV_LOG_INFO : AV_LOG_VERBOSE, "Skipping %d bytes of junk at %"PRId64".\n", i, off); + ret = avio_seek(s->pb, off + i, SEEK_SET); + if (ret < 0) + return ret; + break; + } else if (ret == CHECK_SEEK_FAILED) { + av_log(s, AV_LOG_ERROR, "Invalid frame size (%d): Could not seek to %"PRId64".\n", frame_size, off + i + frame_size); + return AVERROR(EINVAL); + } + } else if (frame_size == CHECK_SEEK_FAILED) { + av_log(s, AV_LOG_ERROR, "Failed to read frame size: Could not seek to %"PRId64".\n", (int64_t) (i + 1024 + frame_size + 4)); + return AVERROR(EINVAL); + } + ret = avio_seek(s->pb, off, SEEK_SET); + if (ret < 0) + return ret; + } + + // the seek index is relative to the end of the xing vbr headers + for (i = 0; i < st->nb_index_entries; i++) + st->index_entries[i].pos += avio_tell(s->pb); + /* the parameters will be extracted from the compressed bitstream */ return 0; } @@ -347,112 +426,170 @@ static int mp3_read_header(AVFormatContext *s) static int mp3_read_packet(AVFormatContext *s, AVPacket *pkt) { - int ret; - - ret = av_get_packet(s->pb, pkt, MP3_PACKET_SIZE); - if (ret < 0) - return ret; + MP3DecContext *mp3 = s->priv_data; + int ret, size; + int64_t pos; + + size= MP3_PACKET_SIZE; + pos = avio_tell(s->pb); + if(mp3->filesize > ID3v1_TAG_SIZE && pos < mp3->filesize) + size= FFMIN(size, mp3->filesize - pos); + + ret= av_get_packet(s->pb, pkt, size); + if (ret <= 0) { + if(ret<0) + return ret; + return AVERROR_EOF; + } + pkt->flags &= ~AV_PKT_FLAG_CORRUPT; pkt->stream_index = 0; - if (ret > ID3v1_TAG_SIZE && - memcmp(&pkt->data[ret - ID3v1_TAG_SIZE], "TAG", 3) == 0) - ret -= ID3v1_TAG_SIZE; - - /* note: we need to modify the packet size here to handle the last - packet */ - pkt->size = ret; return ret; } -#define SEEK_PACKETS 4 -#define SEEK_WINDOW (SEEK_PACKETS * MP3_PACKET_SIZE) +#define SEEK_WINDOW 4096 -/* The toc entry can position to the wrong byte offset, try to pick - * the closest frame by probing the data in a window of 4 packets. - */ - -static int check(AVIOContext *pb, int64_t pos, int64_t *out_pos) +static int check(AVIOContext *pb, int64_t pos, uint32_t *ret_header) { - MPADecodeHeader mh = { 0 }; - int i; - uint32_t header; - int64_t off = 0; - - - for (i = 0; i < SEEK_PACKETS; i++) { - off = avio_seek(pb, pos + mh.frame_size, SEEK_SET); - if (off < 0) - break; - - header = avio_rb32(pb); - - - if (avpriv_mpegaudio_decode_header(&mh, header)) - break; - out_pos[i] = off; - } - - return i; + int64_t ret = avio_seek(pb, pos, SEEK_SET); + uint8_t header_buf[4]; + unsigned header; + MPADecodeHeader sd; + if (ret < 0) + return CHECK_SEEK_FAILED; + + ret = avio_read(pb, &header_buf[0], 4); + /* We should always find four bytes for a valid mpa header. */ + if (ret < 4) + return CHECK_SEEK_FAILED; + + header = AV_RB32(&header_buf[0]); + if (ff_mpa_check_header(header) < 0) + return CHECK_WRONG_HEADER; + if (avpriv_mpegaudio_decode_header(&sd, header) == 1) + return CHECK_WRONG_HEADER; + + if (ret_header) + *ret_header = header; + return sd.frame_size; } -static int reposition(AVFormatContext *s, int64_t pos) +static int64_t mp3_sync(AVFormatContext *s, int64_t target_pos, int flags) { - int ret, best_valid = -1; - int64_t p, best_pos = -1; - - for (p = FFMAX(pos - SEEK_WINDOW / 2, 0); p < pos + SEEK_WINDOW / 2; p++) { - int64_t out_pos[SEEK_PACKETS]; - ret = check(s->pb, p, out_pos); - - if (best_valid < ret) { - int i; - for (i = 0; i < ret; i++) { - if (llabs(best_pos - pos) > llabs(out_pos[i] - pos)) { - best_pos = out_pos[i]; - best_valid = ret; + int dir = (flags&AVSEEK_FLAG_BACKWARD) ? -1 : 1; + int64_t best_pos; + int best_score, i, j; + int64_t ret; + + avio_seek(s->pb, FFMAX(target_pos - SEEK_WINDOW, 0), SEEK_SET); + ret = avio_seek(s->pb, target_pos, SEEK_SET); + if (ret < 0) + return ret; + +#define MIN_VALID 3 + best_pos = target_pos; + best_score = 999; + for(i=0; i<SEEK_WINDOW; i++) { + int64_t pos = target_pos + (dir > 0 ? i - SEEK_WINDOW/4 : -i); + int64_t candidate = -1; + int score = 999; + + if (pos < 0) + continue; + + for(j=0; j<MIN_VALID; j++) { + ret = check(s->pb, pos, NULL); + if(ret < 0) { + if (ret == CHECK_WRONG_HEADER) { + break; + } else if (ret == CHECK_SEEK_FAILED) { + av_log(s, AV_LOG_ERROR, "Could not seek to %"PRId64".\n", pos); + return AVERROR(EINVAL); } } - if (best_pos == pos && best_valid == SEEK_PACKETS) + if ((target_pos - pos)*dir <= 0 && abs(MIN_VALID/2-j) < score) { + candidate = pos; + score = abs(MIN_VALID/2-j); + } + pos += ret; + } + if (best_score > score && j == MIN_VALID) { + best_pos = candidate; + best_score = score; + if(score == 0) break; } } - if (best_valid <= 0) - return AVERROR(ENOSYS); - - p = avio_seek(s->pb, best_pos, SEEK_SET); - if (p < 0) - return p; - - return 0; + return avio_seek(s->pb, best_pos, SEEK_SET); } static int mp3_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags) { MP3DecContext *mp3 = s->priv_data; - AVIndexEntry *ie; + AVIndexEntry *ie, ie1; AVStream *st = s->streams[0]; - int64_t ret = av_index_search_timestamp(st, timestamp, flags); + int64_t best_pos; + int fast_seek = s->flags & AVFMT_FLAG_FAST_SEEK; + int64_t filesize = mp3->header_filesize; + + if (filesize <= 0) { + int64_t size = avio_size(s->pb); + if (size > 0 && size > s->internal->data_offset) + filesize = size - s->internal->data_offset; + } - if (!mp3->xing_toc) - return AVERROR(ENOSYS); + if (mp3->xing_toc && (mp3->usetoc || (fast_seek && !mp3->is_cbr))) { + int64_t ret = av_index_search_timestamp(st, timestamp, flags); - if (ret < 0) - return ret; + // NOTE: The MP3 TOC is not a precise lookup table. Accuracy is worse + // for bigger files. + av_log(s, AV_LOG_WARNING, "Using MP3 TOC to seek; may be imprecise.\n"); - ie = &st->index_entries[ret]; + if (ret < 0) + return ret; - ret = reposition(s, ie->pos); - if (ret < 0) - return ret; + ie = &st->index_entries[ret]; + } else if (fast_seek && st->duration > 0 && filesize > 0) { + if (!mp3->is_cbr) + av_log(s, AV_LOG_WARNING, "Using scaling to seek VBR MP3; may be imprecise.\n"); - ff_update_cur_dts(s, st, ie->timestamp); + ie = &ie1; + timestamp = av_clip64(timestamp, 0, st->duration); + ie->timestamp = timestamp; + ie->pos = av_rescale(timestamp, filesize, st->duration) + s->internal->data_offset; + } else { + return -1; // generic index code + } + + best_pos = mp3_sync(s, ie->pos, flags); + if (best_pos < 0) + return best_pos; + if (mp3->is_cbr && ie == &ie1 && mp3->frames) { + int frame_duration = av_rescale(st->duration, 1, mp3->frames); + ie1.timestamp = frame_duration * av_rescale(best_pos - s->internal->data_offset, mp3->frames, mp3->header_filesize); + } + + ff_update_cur_dts(s, st, ie->timestamp); return 0; } +static const AVOption options[] = { + { "usetoc", "use table of contents", offsetof(MP3DecContext, usetoc), AV_OPT_TYPE_BOOL, {.i64 = 0}, 0, 1, AV_OPT_FLAG_DECODING_PARAM}, + { NULL }, +}; + +static const AVClass demuxer_class = { + .class_name = "mp3", + .item_name = av_default_item_name, + .option = options, + .version = LIBAVUTIL_VERSION_INT, + .category = AV_CLASS_CATEGORY_DEMUXER, +}; + AVInputFormat ff_mp3_demuxer = { .name = "mp3", .long_name = NULL_IF_CONFIG_SMALL("MP2/3 (MPEG audio layer 2/3)"), @@ -463,4 +600,5 @@ AVInputFormat ff_mp3_demuxer = { .priv_data_size = sizeof(MP3DecContext), .flags = AVFMT_GENERIC_INDEX, .extensions = "mp2,mp3,m2a,mpa", /* XXX: use probe */ + .priv_class = &demuxer_class, }; |