diff options
Diffstat (limited to 'libavformat/flacdec.c')
| -rw-r--r-- | libavformat/flacdec.c | 164 |
1 files changed, 145 insertions, 19 deletions
diff --git a/libavformat/flacdec.c b/libavformat/flacdec.c index 494bb095cc..4c7ee59ec5 100644 --- a/libavformat/flacdec.c +++ b/libavformat/flacdec.c @@ -2,20 +2,20 @@ * Raw FLAC demuxer * Copyright (c) 2001 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 */ @@ -28,17 +28,33 @@ #include "vorbiscomment.h" #include "replaygain.h" +#define SEEKPOINT_SIZE 18 + +typedef struct FLACDecContext { + int found_seektable; +} FLACDecContext; + +static void reset_index_position(int64_t metadata_head_size, AVStream *st) +{ + /* the real seek index offset should be the size of metadata blocks with the offset in the frame blocks */ + int i; + for(i=0; i<st->nb_index_entries; i++) { + st->index_entries[i].pos += metadata_head_size; + } +} + static int flac_read_header(AVFormatContext *s) { int ret, metadata_last=0, metadata_type, metadata_size, found_streaminfo=0; uint8_t header[4]; uint8_t *buffer=NULL; + FLACDecContext *flac = s->priv_data; AVStream *st = avformat_new_stream(s, NULL); if (!st) return AVERROR(ENOMEM); st->codec->codec_type = AVMEDIA_TYPE_AUDIO; st->codec->codec_id = AV_CODEC_ID_FLAC; - st->need_parsing = AVSTREAM_PARSE_FULL; + st->need_parsing = AVSTREAM_PARSE_FULL_RAW; /* the parameters will be extracted from the compressed bitstream */ /* if fLaC marker is not found, assume there is no header */ @@ -48,7 +64,7 @@ static int flac_read_header(AVFormatContext *s) } /* process metadata blocks */ - while (!s->pb->eof_reached && !metadata_last) { + while (!avio_feof(s->pb) && !metadata_last) { avio_read(s->pb, header, 4); flac_parse_block_header(header, &metadata_last, &metadata_type, &metadata_size); @@ -58,13 +74,13 @@ static int flac_read_header(AVFormatContext *s) case FLAC_METADATA_TYPE_CUESHEET: case FLAC_METADATA_TYPE_PICTURE: case FLAC_METADATA_TYPE_VORBIS_COMMENT: + case FLAC_METADATA_TYPE_SEEKTABLE: buffer = av_mallocz(metadata_size + AV_INPUT_BUFFER_PADDING_SIZE); if (!buffer) { return AVERROR(ENOMEM); } if (avio_read(s->pb, buffer, metadata_size) != metadata_size) { - av_freep(&buffer); - return AVERROR(EIO); + RETURN_ERROR(AVERROR(EIO)); } break; /* skip metadata block for unsupported types */ @@ -80,12 +96,10 @@ static int flac_read_header(AVFormatContext *s) /* STREAMINFO can only occur once */ if (found_streaminfo) { - av_freep(&buffer); - return AVERROR_INVALIDDATA; + RETURN_ERROR(AVERROR_INVALIDDATA); } if (metadata_size != FLAC_STREAMINFO_SIZE) { - av_freep(&buffer); - return AVERROR_INVALIDDATA; + RETURN_ERROR(AVERROR_INVALIDDATA); } found_streaminfo = 1; st->codec->extradata = buffer; @@ -109,24 +123,25 @@ static int flac_read_header(AVFormatContext *s) const uint8_t *offset; int i, chapters, track, ti; if (metadata_size < 431) - return AVERROR_INVALIDDATA; + RETURN_ERROR(AVERROR_INVALIDDATA); offset = buffer + 395; chapters = bytestream_get_byte(&offset) - 1; if (chapters <= 0) - return AVERROR_INVALIDDATA; + RETURN_ERROR(AVERROR_INVALIDDATA); for (i = 0; i < chapters; i++) { if (offset + 36 - buffer > metadata_size) - return AVERROR_INVALIDDATA; + RETURN_ERROR(AVERROR_INVALIDDATA); start = bytestream_get_be64(&offset); track = bytestream_get_byte(&offset); bytestream_get_buffer(&offset, isrc, 12); isrc[12] = 0; offset += 14; ti = bytestream_get_byte(&offset); - if (ti <= 0) return AVERROR_INVALIDDATA; + if (ti <= 0) RETURN_ERROR(AVERROR_INVALIDDATA); offset += ti * 12; avpriv_new_chapter(s, track, st->time_base, start, AV_NOPTS_VALUE, isrc); } + av_freep(&buffer); } else if (metadata_type == FLAC_METADATA_TYPE_PICTURE) { ret = ff_flac_parse_picture(s, buffer, metadata_size); av_freep(&buffer); @@ -134,11 +149,26 @@ static int flac_read_header(AVFormatContext *s) av_log(s, AV_LOG_ERROR, "Error parsing attached picture.\n"); return ret; } - } else { + } else if (metadata_type == FLAC_METADATA_TYPE_SEEKTABLE) { + const uint8_t *seekpoint = buffer; + int i, seek_point_count = metadata_size/SEEKPOINT_SIZE; + flac->found_seektable = 1; + if ((s->flags&AVFMT_FLAG_FAST_SEEK)) { + for(i=0; i<seek_point_count; i++) { + int64_t timestamp = bytestream_get_be64(&seekpoint); + int64_t pos = bytestream_get_be64(&seekpoint); + /* skip number of samples */ + bytestream_get_be16(&seekpoint); + av_add_index_entry(st, pos, timestamp, 0, 0, AVINDEX_KEYFRAME); + } + } + av_freep(&buffer); + } + else { + /* STREAMINFO must be the first block */ if (!found_streaminfo) { - av_freep(&buffer); - return AVERROR_INVALIDDATA; + RETURN_ERROR(AVERROR_INVALIDDATA); } /* process supported blocks other than STREAMINFO */ if (metadata_type == FLAC_METADATA_TYPE_VORBIS_COMMENT) { @@ -172,23 +202,119 @@ static int flac_read_header(AVFormatContext *s) if (ret < 0) return ret; + reset_index_position(avio_tell(s->pb), st); return 0; + +fail: + av_free(buffer); + return ret; +} + +static int raw_flac_probe(AVProbeData *p) +{ + if ((p->buf[2] & 0xF0) == 0) // blocksize code invalid + return 0; + if ((p->buf[2] & 0x0F) == 0x0F) // sample rate code invalid + return 0; + if ((p->buf[3] & 0xF0) >= FLAC_MAX_CHANNELS + FLAC_CHMODE_MID_SIDE << 4) + // channel mode invalid + return 0; + if ((p->buf[3] & 0x06) == 0x06) // bits per sample code invalid + return 0; + if ((p->buf[3] & 0x01) == 0x01) // reserved bit set + return 0; + return AVPROBE_SCORE_EXTENSION / 4 + 1; } static int flac_probe(AVProbeData *p) { + if ((AV_RB16(p->buf) & 0xFFFE) == 0xFFF8) + return raw_flac_probe(p); if (p->buf_size < 4 || memcmp(p->buf, "fLaC", 4)) return 0; return AVPROBE_SCORE_EXTENSION; } +static av_unused int64_t flac_read_timestamp(AVFormatContext *s, int stream_index, + int64_t *ppos, int64_t pos_limit) +{ + AVPacket pkt, out_pkt; + AVStream *st = s->streams[stream_index]; + AVCodecParserContext *parser; + int ret; + int64_t pts = AV_NOPTS_VALUE; + + if (avio_seek(s->pb, *ppos, SEEK_SET) < 0) + return AV_NOPTS_VALUE; + + av_init_packet(&pkt); + parser = av_parser_init(st->codec->codec_id); + if (!parser){ + return AV_NOPTS_VALUE; + } + parser->flags |= PARSER_FLAG_USE_CODEC_TS; + + for (;;){ + ret = ff_raw_read_partial_packet(s, &pkt); + if (ret < 0){ + if (ret == AVERROR(EAGAIN)) + continue; + else + break; + } + av_init_packet(&out_pkt); + ret = av_parser_parse2(parser, st->codec, + &out_pkt.data, &out_pkt.size, pkt.data, pkt.size, + pkt.pts, pkt.dts, *ppos); + + av_free_packet(&pkt); + if (out_pkt.size){ + int size = out_pkt.size; + if (parser->pts != AV_NOPTS_VALUE){ + // seeking may not have started from beginning of a frame + // calculate frame start position from next frame backwards + *ppos = parser->next_frame_offset - size; + pts = parser->pts; + break; + } + } + } + av_parser_close(parser); + return pts; +} + +static int flac_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags) { + int index; + int64_t pos; + AVIndexEntry e; + FLACDecContext *flac = s->priv_data; + + if (!flac->found_seektable || !(s->flags&AVFMT_FLAG_FAST_SEEK)) { + return -1; + } + + index = av_index_search_timestamp(s->streams[0], timestamp, flags); + if(index<0 || index >= s->streams[0]->nb_index_entries) + return -1; + + e = s->streams[0]->index_entries[index]; + pos = avio_seek(s->pb, e.pos, SEEK_SET); + if (pos >= 0) { + return 0; + } + return -1; +} + AVInputFormat ff_flac_demuxer = { .name = "flac", .long_name = NULL_IF_CONFIG_SMALL("raw FLAC"), .read_probe = flac_probe, .read_header = flac_read_header, .read_packet = ff_raw_read_partial_packet, + .read_seek = flac_seek, + .read_timestamp = flac_read_timestamp, .flags = AVFMT_GENERIC_INDEX, .extensions = "flac", .raw_codec_id = AV_CODEC_ID_FLAC, + .priv_data_size = sizeof(FLACDecContext), }; 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