mirror of
https://github.com/FFmpeg/FFmpeg.git
synced 2024-12-28 20:53:54 +02:00
297 lines
9.8 KiB
C
297 lines
9.8 KiB
C
/*
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* Raw FLAC demuxer
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* Copyright (c) 2001 Fabrice Bellard
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "libavcodec/flac.h"
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#include "avformat.h"
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#include "id3v2.h"
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#include "internal.h"
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#include "rawdec.h"
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#include "oggdec.h"
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#include "vorbiscomment.h"
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#include "libavcodec/bytestream.h"
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#define RETURN_ERROR(code) do { ret = (code); goto fail; } while (0)
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static int parse_picture(AVFormatContext *s, uint8_t *buf, int buf_size)
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{
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const CodecMime *mime = ff_id3v2_mime_tags;
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enum AVCodecID id = AV_CODEC_ID_NONE;
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uint8_t mimetype[64], *desc = NULL, *data = NULL;
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AVIOContext *pb = NULL;
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AVStream *st;
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int type, width, height;
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int len, ret = 0;
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pb = avio_alloc_context(buf, buf_size, 0, NULL, NULL, NULL, NULL);
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if (!pb)
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return AVERROR(ENOMEM);
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/* read the picture type */
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type = avio_rb32(pb);
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if (type >= FF_ARRAY_ELEMS(ff_id3v2_picture_types) || type < 0) {
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av_log(s, AV_LOG_ERROR, "Invalid picture type: %d.\n", type);
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if (s->error_recognition & AV_EF_EXPLODE) {
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RETURN_ERROR(AVERROR_INVALIDDATA);
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}
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type = 0;
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}
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/* picture mimetype */
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len = avio_rb32(pb);
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if (len <= 0 ||
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avio_read(pb, mimetype, FFMIN(len, sizeof(mimetype) - 1)) != len) {
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av_log(s, AV_LOG_ERROR, "Could not read mimetype from an attached "
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"picture.\n");
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if (s->error_recognition & AV_EF_EXPLODE)
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ret = AVERROR_INVALIDDATA;
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goto fail;
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}
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mimetype[len] = 0;
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while (mime->id != AV_CODEC_ID_NONE) {
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if (!strncmp(mime->str, mimetype, sizeof(mimetype))) {
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id = mime->id;
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break;
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}
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mime++;
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}
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if (id == AV_CODEC_ID_NONE) {
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av_log(s, AV_LOG_ERROR, "Unknown attached picture mimetype: %s.\n",
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mimetype);
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if (s->error_recognition & AV_EF_EXPLODE)
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ret = AVERROR_INVALIDDATA;
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goto fail;
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}
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/* picture description */
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len = avio_rb32(pb);
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if (len > 0) {
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if (!(desc = av_malloc(len + 1))) {
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RETURN_ERROR(AVERROR(ENOMEM));
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}
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if (avio_read(pb, desc, len) != len) {
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av_log(s, AV_LOG_ERROR, "Error reading attached picture description.\n");
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if (s->error_recognition & AV_EF_EXPLODE)
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ret = AVERROR(EIO);
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goto fail;
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}
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desc[len] = 0;
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}
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/* picture metadata */
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width = avio_rb32(pb);
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height = avio_rb32(pb);
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avio_skip(pb, 8);
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/* picture data */
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len = avio_rb32(pb);
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if (len <= 0) {
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av_log(s, AV_LOG_ERROR, "Invalid attached picture size: %d.\n", len);
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if (s->error_recognition & AV_EF_EXPLODE)
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ret = AVERROR_INVALIDDATA;
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goto fail;
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}
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if (!(data = av_malloc(len))) {
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RETURN_ERROR(AVERROR(ENOMEM));
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}
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if (avio_read(pb, data, len) != len) {
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av_log(s, AV_LOG_ERROR, "Error reading attached picture data.\n");
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if (s->error_recognition & AV_EF_EXPLODE)
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ret = AVERROR(EIO);
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goto fail;
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}
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st = avformat_new_stream(s, NULL);
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if (!st) {
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RETURN_ERROR(AVERROR(ENOMEM));
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}
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av_init_packet(&st->attached_pic);
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st->attached_pic.data = data;
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st->attached_pic.size = len;
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st->attached_pic.destruct = av_destruct_packet;
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st->attached_pic.stream_index = st->index;
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st->attached_pic.flags |= AV_PKT_FLAG_KEY;
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st->disposition |= AV_DISPOSITION_ATTACHED_PIC;
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st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
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st->codec->codec_id = id;
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st->codec->width = width;
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st->codec->height = height;
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av_dict_set(&st->metadata, "comment", ff_id3v2_picture_types[type], 0);
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if (desc)
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av_dict_set(&st->metadata, "title", desc, AV_DICT_DONT_STRDUP_VAL);
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av_freep(&pb);
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return 0;
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fail:
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av_freep(&desc);
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av_freep(&data);
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av_freep(&pb);
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return ret;
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}
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static int flac_read_header(AVFormatContext *s)
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{
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int ret, metadata_last=0, metadata_type, metadata_size, found_streaminfo=0;
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uint8_t header[4];
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uint8_t *buffer=NULL;
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AVStream *st = avformat_new_stream(s, NULL);
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if (!st)
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return AVERROR(ENOMEM);
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st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
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st->codec->codec_id = AV_CODEC_ID_FLAC;
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st->need_parsing = AVSTREAM_PARSE_FULL_RAW;
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/* the parameters will be extracted from the compressed bitstream */
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/* if fLaC marker is not found, assume there is no header */
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if (avio_rl32(s->pb) != MKTAG('f','L','a','C')) {
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avio_seek(s->pb, -4, SEEK_CUR);
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return 0;
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}
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/* process metadata blocks */
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while (!url_feof(s->pb) && !metadata_last) {
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avio_read(s->pb, header, 4);
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avpriv_flac_parse_block_header(header, &metadata_last, &metadata_type,
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&metadata_size);
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switch (metadata_type) {
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/* allocate and read metadata block for supported types */
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case FLAC_METADATA_TYPE_STREAMINFO:
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case FLAC_METADATA_TYPE_CUESHEET:
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case FLAC_METADATA_TYPE_PICTURE:
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case FLAC_METADATA_TYPE_VORBIS_COMMENT:
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buffer = av_mallocz(metadata_size + FF_INPUT_BUFFER_PADDING_SIZE);
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if (!buffer) {
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return AVERROR(ENOMEM);
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}
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if (avio_read(s->pb, buffer, metadata_size) != metadata_size) {
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RETURN_ERROR(AVERROR(EIO));
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}
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break;
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/* skip metadata block for unsupported types */
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default:
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ret = avio_skip(s->pb, metadata_size);
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if (ret < 0)
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return ret;
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}
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if (metadata_type == FLAC_METADATA_TYPE_STREAMINFO) {
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FLACStreaminfo si;
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/* STREAMINFO can only occur once */
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if (found_streaminfo) {
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RETURN_ERROR(AVERROR_INVALIDDATA);
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}
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if (metadata_size != FLAC_STREAMINFO_SIZE) {
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RETURN_ERROR(AVERROR_INVALIDDATA);
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}
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found_streaminfo = 1;
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st->codec->extradata = buffer;
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st->codec->extradata_size = metadata_size;
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buffer = NULL;
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/* get codec params from STREAMINFO header */
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avpriv_flac_parse_streaminfo(st->codec, &si, st->codec->extradata);
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/* set time base and duration */
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if (si.samplerate > 0) {
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avpriv_set_pts_info(st, 64, 1, si.samplerate);
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if (si.samples > 0)
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st->duration = si.samples;
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}
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} else if (metadata_type == FLAC_METADATA_TYPE_CUESHEET) {
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uint8_t isrc[13];
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uint64_t start;
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const uint8_t *offset;
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int i, chapters, track, ti;
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if (metadata_size < 431)
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RETURN_ERROR(AVERROR_INVALIDDATA);
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offset = buffer + 395;
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chapters = bytestream_get_byte(&offset) - 1;
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if (chapters <= 0)
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RETURN_ERROR(AVERROR_INVALIDDATA);
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for (i = 0; i < chapters; i++) {
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if (offset + 36 - buffer > metadata_size)
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RETURN_ERROR(AVERROR_INVALIDDATA);
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start = bytestream_get_be64(&offset);
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track = bytestream_get_byte(&offset);
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bytestream_get_buffer(&offset, isrc, 12);
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isrc[12] = 0;
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offset += 14;
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ti = bytestream_get_byte(&offset);
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if (ti <= 0) RETURN_ERROR(AVERROR_INVALIDDATA);
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offset += ti * 12;
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avpriv_new_chapter(s, track, st->time_base, start, AV_NOPTS_VALUE, isrc);
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}
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av_freep(&buffer);
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} else if (metadata_type == FLAC_METADATA_TYPE_PICTURE) {
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ret = parse_picture(s, buffer, metadata_size);
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av_freep(&buffer);
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if (ret < 0) {
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av_log(s, AV_LOG_ERROR, "Error parsing attached picture.\n");
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return ret;
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}
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} else {
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/* STREAMINFO must be the first block */
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if (!found_streaminfo) {
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RETURN_ERROR(AVERROR_INVALIDDATA);
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}
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/* process supported blocks other than STREAMINFO */
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if (metadata_type == FLAC_METADATA_TYPE_VORBIS_COMMENT) {
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if (ff_vorbis_comment(s, &s->metadata, buffer, metadata_size)) {
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av_log(s, AV_LOG_WARNING, "error parsing VorbisComment metadata\n");
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}
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}
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av_freep(&buffer);
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}
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}
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return 0;
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fail:
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av_free(buffer);
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return ret;
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}
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static int flac_probe(AVProbeData *p)
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{
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const uint8_t *bufptr = p->buf;
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const uint8_t *end = p->buf + p->buf_size;
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if(bufptr > end-4 || memcmp(bufptr, "fLaC", 4)) return 0;
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else return AVPROBE_SCORE_MAX/2;
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}
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AVInputFormat ff_flac_demuxer = {
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.name = "flac",
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.long_name = NULL_IF_CONFIG_SMALL("raw FLAC"),
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.read_probe = flac_probe,
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.read_header = flac_read_header,
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.read_packet = ff_raw_read_partial_packet,
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.flags = AVFMT_GENERIC_INDEX,
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.extensions = "flac",
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.raw_codec_id = AV_CODEC_ID_FLAC,
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};
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