| /* | |
| * Raw FLAC demuxer | |
| * Copyright (c) 2001 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 "libavutil/channel_layout.h" | |
| #include "libavcodec/avcodec.h" | |
| #include "libavcodec/bytestream.h" | |
| #include "libavcodec/flac.h" | |
| #include "avformat.h" | |
| #include "demux.h" | |
| #include "flac_picture.h" | |
| #include "internal.h" | |
| #include "rawdec.h" | |
| #include "oggdec.h" | |
| #include "replaygain.h" | |
| #define SEEKPOINT_SIZE 18 | |
| typedef struct FLACDecContext { | |
| FFRawDemuxerContext rawctx; | |
| int found_seektable; | |
| AVCodecContext *parser_dec; | |
| } FLACDecContext; | |
| static void reset_index_position(int64_t metadata_head_size, AVStream *st) | |
| { | |
| FFStream *const sti = ffstream(st); | |
| /* the real seek index offset should be the size of metadata blocks with the offset in the frame blocks */ | |
| for (int i = 0; i < sti->nb_index_entries; i++) | |
| sti->index_entries[i].pos += metadata_head_size; | |
| } | |
| static const uint16_t sr_table[16] = { | |
| 0, 1764, 3528, 3840, 160, 320, 441, 480, 640, 882, 960, 1920, 0, 0, 0, 0 | |
| }; | |
| 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; | |
| uint32_t marker; | |
| FLACDecContext *flac = s->priv_data; | |
| AVStream *st = avformat_new_stream(s, NULL); | |
| if (!st) | |
| return AVERROR(ENOMEM); | |
| st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO; | |
| st->codecpar->codec_id = AV_CODEC_ID_FLAC; | |
| ffstream(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 */ | |
| marker = avio_rl32(s->pb); | |
| if (marker != MKTAG('f','L','a','C')) { | |
| const int sample_rate = 50 * sr_table[(marker >> 16) & 0xF]; | |
| if (sample_rate) | |
| avpriv_set_pts_info(st, 64, 1, sample_rate); | |
| avio_seek(s->pb, -4, SEEK_CUR); | |
| return 0; | |
| } | |
| /* process metadata blocks */ | |
| while (!avio_feof(s->pb) && !metadata_last) { | |
| if (avio_read(s->pb, header, 4) != 4) | |
| return AVERROR_INVALIDDATA; | |
| flac_parse_block_header(header, &metadata_last, &metadata_type, | |
| &metadata_size); | |
| switch (metadata_type) { | |
| /* allocate and read metadata block for supported types */ | |
| case FLAC_METADATA_TYPE_STREAMINFO: | |
| 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) { | |
| RETURN_ERROR(AVERROR(EIO)); | |
| } | |
| break; | |
| /* skip metadata block for unsupported types */ | |
| default: | |
| ret = avio_skip(s->pb, metadata_size); | |
| if (ret < 0) | |
| return ret; | |
| } | |
| if (metadata_type == FLAC_METADATA_TYPE_STREAMINFO) { | |
| uint32_t samplerate; | |
| uint64_t samples; | |
| /* STREAMINFO can only occur once */ | |
| if (found_streaminfo) { | |
| RETURN_ERROR(AVERROR_INVALIDDATA); | |
| } | |
| if (metadata_size != FLAC_STREAMINFO_SIZE) { | |
| RETURN_ERROR(AVERROR_INVALIDDATA); | |
| } | |
| found_streaminfo = 1; | |
| st->codecpar->extradata = buffer; | |
| st->codecpar->extradata_size = metadata_size; | |
| buffer = NULL; | |
| /* get sample rate and sample count from STREAMINFO header; | |
| * other parameters will be extracted by the parser */ | |
| samplerate = AV_RB24(st->codecpar->extradata + 10) >> 4; | |
| samples = (AV_RB64(st->codecpar->extradata + 13) >> 24) & ((1ULL << 36) - 1); | |
| /* set time base and duration */ | |
| if (samplerate > 0) { | |
| avpriv_set_pts_info(st, 64, 1, samplerate); | |
| if (samples > 0) | |
| st->duration = samples; | |
| } | |
| } else if (metadata_type == FLAC_METADATA_TYPE_CUESHEET) { | |
| uint8_t isrc[13]; | |
| uint64_t start; | |
| const uint8_t *offset; | |
| int i, chapters, track, ti; | |
| if (metadata_size < 431) | |
| RETURN_ERROR(AVERROR_INVALIDDATA); | |
| offset = buffer + 395; | |
| chapters = bytestream_get_byte(&offset) - 1; | |
| if (chapters <= 0) | |
| RETURN_ERROR(AVERROR_INVALIDDATA); | |
| for (i = 0; i < chapters; i++) { | |
| if (offset + 36 - buffer > metadata_size) | |
| 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_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, 1); | |
| av_freep(&buffer); | |
| if (ret < 0) { | |
| av_log(s, AV_LOG_ERROR, "Error parsing attached picture.\n"); | |
| return ret; | |
| } | |
| } 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) { | |
| RETURN_ERROR(AVERROR_INVALIDDATA); | |
| } | |
| /* process supported blocks other than STREAMINFO */ | |
| if (metadata_type == FLAC_METADATA_TYPE_VORBIS_COMMENT) { | |
| AVDictionaryEntry *chmask; | |
| ret = ff_vorbis_comment(s, &s->metadata, buffer, metadata_size, 1); | |
| if (ret < 0) { | |
| av_log(s, AV_LOG_WARNING, "error parsing VorbisComment metadata\n"); | |
| } else if (ret > 0) { | |
| s->event_flags |= AVFMT_EVENT_FLAG_METADATA_UPDATED; | |
| } | |
| /* parse the channels mask if present */ | |
| chmask = av_dict_get(s->metadata, "WAVEFORMATEXTENSIBLE_CHANNEL_MASK", NULL, 0); | |
| if (chmask) { | |
| uint64_t mask = strtol(chmask->value, NULL, 0); | |
| if (!mask || mask & ~0x3ffffULL) { | |
| av_log(s, AV_LOG_WARNING, | |
| "Invalid value of WAVEFORMATEXTENSIBLE_CHANNEL_MASK\n"); | |
| } else { | |
| av_channel_layout_from_mask(&st->codecpar->ch_layout, mask); | |
| av_dict_set(&s->metadata, "WAVEFORMATEXTENSIBLE_CHANNEL_MASK", NULL, 0); | |
| } | |
| } | |
| } | |
| av_freep(&buffer); | |
| } | |
| } | |
| ret = ff_replaygain_export(st, s->metadata); | |
| 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(const 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(const AVProbeData *p) | |
| { | |
| if ((AV_RB16(p->buf) & 0xFFFE) == 0xFFF8) | |
| return raw_flac_probe(p); | |
| /* file header + metadata header + checked bytes of streaminfo */ | |
| if (p->buf_size >= 4 + 4 + 13) { | |
| int type = p->buf[4] & 0x7f; | |
| int size = AV_RB24(p->buf + 5); | |
| int min_block_size = AV_RB16(p->buf + 8); | |
| int max_block_size = AV_RB16(p->buf + 10); | |
| int sample_rate = AV_RB24(p->buf + 18) >> 4; | |
| if (memcmp(p->buf, "fLaC", 4)) | |
| return 0; | |
| if (type == FLAC_METADATA_TYPE_STREAMINFO && | |
| size == FLAC_STREAMINFO_SIZE && | |
| min_block_size >= 16 && | |
| max_block_size >= min_block_size && | |
| sample_rate && sample_rate <= 655350) | |
| return AVPROBE_SCORE_MAX; | |
| return AVPROBE_SCORE_EXTENSION; | |
| } | |
| return 0; | |
| } | |
| static av_unused int64_t flac_read_timestamp(AVFormatContext *s, int stream_index, | |
| int64_t *ppos, int64_t pos_limit) | |
| { | |
| FLACDecContext *flac = s->priv_data; | |
| FFFormatContext *const si = ffformatcontext(s); | |
| AVPacket *const pkt = si->parse_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; | |
| if (!flac->parser_dec) { | |
| flac->parser_dec = avcodec_alloc_context3(NULL); | |
| if (!flac->parser_dec) | |
| return AV_NOPTS_VALUE; | |
| ret = avcodec_parameters_to_context(flac->parser_dec, st->codecpar); | |
| if (ret < 0) | |
| return ret; | |
| } | |
| parser = av_parser_init(st->codecpar->codec_id); | |
| if (!parser) | |
| return AV_NOPTS_VALUE; | |
| parser->flags |= PARSER_FLAG_USE_CODEC_TS; | |
| for (;;){ | |
| uint8_t *data; | |
| int size; | |
| ret = ff_raw_read_partial_packet(s, pkt); | |
| if (ret < 0){ | |
| if (ret == AVERROR(EAGAIN)) | |
| continue; | |
| else { | |
| av_packet_unref(pkt); | |
| av_assert1(!pkt->size); | |
| } | |
| } | |
| av_parser_parse2(parser, flac->parser_dec, | |
| &data, &size, pkt->data, pkt->size, | |
| pkt->pts, pkt->dts, *ppos); | |
| av_packet_unref(pkt); | |
| if (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; | |
| } | |
| } else if (ret < 0) | |
| break; | |
| } | |
| av_parser_close(parser); | |
| return pts; | |
| } | |
| static int flac_close(AVFormatContext *s) | |
| { | |
| FLACDecContext *flac = s->priv_data; | |
| avcodec_free_context(&flac->parser_dec); | |
| return 0; | |
| } | |
| static int flac_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags) { | |
| AVStream *const st = s->streams[0]; | |
| FFStream *const sti = ffstream(st); | |
| 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(st, timestamp, flags); | |
| if (index < 0 || index >= sti->nb_index_entries) | |
| return -1; | |
| e = sti->index_entries[index]; | |
| pos = avio_seek(s->pb, e.pos, SEEK_SET); | |
| if (pos >= 0) { | |
| return 0; | |
| } | |
| return -1; | |
| } | |
| const FFInputFormat ff_flac_demuxer = { | |
| .p.name = "flac", | |
| .p.long_name = NULL_IF_CONFIG_SMALL("raw FLAC"), | |
| .p.flags = AVFMT_GENERIC_INDEX, | |
| .p.extensions = "flac", | |
| .p.priv_class = &ff_raw_demuxer_class, | |
| .read_probe = flac_probe, | |
| .read_header = flac_read_header, | |
| .read_close = flac_close, | |
| .read_packet = ff_raw_read_partial_packet, | |
| .read_seek = flac_seek, | |
| .read_timestamp = flac_read_timestamp, | |
| .raw_codec_id = AV_CODEC_ID_FLAC, | |
| .priv_data_size = sizeof(FLACDecContext), | |
| }; |