diff options
Diffstat (limited to 'ffmpeg/libavformat/flacdec.c')
| -rw-r--r-- | ffmpeg/libavformat/flacdec.c | 295 |
1 files changed, 295 insertions, 0 deletions
diff --git a/ffmpeg/libavformat/flacdec.c b/ffmpeg/libavformat/flacdec.c new file mode 100644 index 0000000..d5aacfd --- /dev/null +++ b/ffmpeg/libavformat/flacdec.c @@ -0,0 +1,295 @@ +/* + * 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 "libavcodec/flac.h" +#include "avformat.h" +#include "id3v2.h" +#include "internal.h" +#include "rawdec.h" +#include "oggdec.h" +#include "vorbiscomment.h" +#include "libavcodec/bytestream.h" + +#define RETURN_ERROR(code) do { ret = (code); goto fail; } while (0) + +static int parse_picture(AVFormatContext *s, uint8_t *buf, int buf_size) +{ + const CodecMime *mime = ff_id3v2_mime_tags; + enum AVCodecID id = AV_CODEC_ID_NONE; + AVBufferRef *data = NULL; + uint8_t mimetype[64], *desc = NULL; + AVIOContext *pb = NULL; + AVStream *st; + int type, width, height; + int len, ret = 0; + + pb = avio_alloc_context(buf, buf_size, 0, NULL, NULL, NULL, NULL); + if (!pb) + return AVERROR(ENOMEM); + + /* read the picture type */ + type = avio_rb32(pb); + if (type >= FF_ARRAY_ELEMS(ff_id3v2_picture_types) || type < 0) { + av_log(s, AV_LOG_ERROR, "Invalid picture type: %d.\n", type); + if (s->error_recognition & AV_EF_EXPLODE) { + RETURN_ERROR(AVERROR_INVALIDDATA); + } + type = 0; + } + + /* picture mimetype */ + len = avio_rb32(pb); + if (len <= 0 || + avio_read(pb, mimetype, FFMIN(len, sizeof(mimetype) - 1)) != len) { + av_log(s, AV_LOG_ERROR, "Could not read mimetype from an attached " + "picture.\n"); + if (s->error_recognition & AV_EF_EXPLODE) + ret = AVERROR_INVALIDDATA; + goto fail; + } + mimetype[len] = 0; + + while (mime->id != AV_CODEC_ID_NONE) { + if (!strncmp(mime->str, mimetype, sizeof(mimetype))) { + id = mime->id; + break; + } + mime++; + } + if (id == AV_CODEC_ID_NONE) { + av_log(s, AV_LOG_ERROR, "Unknown attached picture mimetype: %s.\n", + mimetype); + if (s->error_recognition & AV_EF_EXPLODE) + ret = AVERROR_INVALIDDATA; + goto fail; + } + + /* picture description */ + len = avio_rb32(pb); + if (len > 0) { + if (!(desc = av_malloc(len + 1))) { + RETURN_ERROR(AVERROR(ENOMEM)); + } + + if (avio_read(pb, desc, len) != len) { + av_log(s, AV_LOG_ERROR, "Error reading attached picture description.\n"); + if (s->error_recognition & AV_EF_EXPLODE) + ret = AVERROR(EIO); + goto fail; + } + desc[len] = 0; + } + + /* picture metadata */ + width = avio_rb32(pb); + height = avio_rb32(pb); + avio_skip(pb, 8); + + /* picture data */ + len = avio_rb32(pb); + if (len <= 0) { + av_log(s, AV_LOG_ERROR, "Invalid attached picture size: %d.\n", len); + if (s->error_recognition & AV_EF_EXPLODE) + ret = AVERROR_INVALIDDATA; + goto fail; + } + if (!(data = av_buffer_alloc(len))) { + RETURN_ERROR(AVERROR(ENOMEM)); + } + if (avio_read(pb, data->data, len) != len) { + av_log(s, AV_LOG_ERROR, "Error reading attached picture data.\n"); + if (s->error_recognition & AV_EF_EXPLODE) + ret = AVERROR(EIO); + goto fail; + } + + st = avformat_new_stream(s, NULL); + if (!st) { + RETURN_ERROR(AVERROR(ENOMEM)); + } + + av_init_packet(&st->attached_pic); + st->attached_pic.buf = data; + st->attached_pic.data = data->data; + st->attached_pic.size = len; + st->attached_pic.stream_index = st->index; + st->attached_pic.flags |= AV_PKT_FLAG_KEY; + + st->disposition |= AV_DISPOSITION_ATTACHED_PIC; + st->codec->codec_type = AVMEDIA_TYPE_VIDEO; + st->codec->codec_id = id; + st->codec->width = width; + st->codec->height = height; + av_dict_set(&st->metadata, "comment", ff_id3v2_picture_types[type], 0); + if (desc) + av_dict_set(&st->metadata, "title", desc, AV_DICT_DONT_STRDUP_VAL); + + av_freep(&pb); + + return 0; + +fail: + av_buffer_unref(&data); + av_freep(&desc); + av_freep(&pb); + return ret; + +} + +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; + 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_RAW; + /* the parameters will be extracted from the compressed bitstream */ + + /* if fLaC marker is not found, assume there is no header */ + if (avio_rl32(s->pb) != MKTAG('f','L','a','C')) { + avio_seek(s->pb, -4, SEEK_CUR); + return 0; + } + + /* process metadata blocks */ + while (!url_feof(s->pb) && !metadata_last) { + avio_read(s->pb, header, 4); + avpriv_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: + buffer = av_mallocz(metadata_size + FF_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) { + FLACStreaminfo si; + /* 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->codec->extradata = buffer; + st->codec->extradata_size = metadata_size; + buffer = NULL; + + /* get codec params from STREAMINFO header */ + avpriv_flac_parse_streaminfo(st->codec, &si, st->codec->extradata); + + /* set time base and duration */ + if (si.samplerate > 0) { + avpriv_set_pts_info(st, 64, 1, si.samplerate); + if (si.samples > 0) + st->duration = si.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 = parse_picture(s, buffer, metadata_size); + av_freep(&buffer); + if (ret < 0) { + av_log(s, AV_LOG_ERROR, "Error parsing attached picture.\n"); + return ret; + } + } 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) { + if (ff_vorbis_comment(s, &s->metadata, buffer, metadata_size)) { + av_log(s, AV_LOG_WARNING, "error parsing VorbisComment metadata\n"); + } + } + av_freep(&buffer); + } + } + + return 0; + +fail: + av_free(buffer); + return ret; +} + +static int flac_probe(AVProbeData *p) +{ + if (p->buf_size < 4 || memcmp(p->buf, "fLaC", 4)) + return 0; + return AVPROBE_SCORE_MAX/2; +} + +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, + .flags = AVFMT_GENERIC_INDEX, + .extensions = "flac", + .raw_codec_id = AV_CODEC_ID_FLAC, +}; |