diff options
Diffstat (limited to 'contrib/ffmpeg/libavformat/wav.c')
| -rw-r--r-- | contrib/ffmpeg/libavformat/wav.c | 253 |
1 files changed, 253 insertions, 0 deletions
diff --git a/contrib/ffmpeg/libavformat/wav.c b/contrib/ffmpeg/libavformat/wav.c new file mode 100644 index 000000000..7fb982349 --- /dev/null +++ b/contrib/ffmpeg/libavformat/wav.c @@ -0,0 +1,253 @@ +/* + * WAV muxer and demuxer + * Copyright (c) 2001, 2002 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 "avformat.h" +#include "allformats.h" +#include "riff.h" + +typedef struct { + offset_t data; + offset_t data_end; +} WAVContext; + +#ifdef CONFIG_MUXERS +static int wav_write_header(AVFormatContext *s) +{ + WAVContext *wav = s->priv_data; + ByteIOContext *pb = &s->pb; + offset_t fmt; + + put_tag(pb, "RIFF"); + put_le32(pb, 0); /* file length */ + put_tag(pb, "WAVE"); + + /* format header */ + fmt = start_tag(pb, "fmt "); + if (put_wav_header(pb, s->streams[0]->codec) < 0) { + av_free(wav); + return -1; + } + end_tag(pb, fmt); + + av_set_pts_info(s->streams[0], 64, 1, s->streams[0]->codec->sample_rate); + + /* data header */ + wav->data = start_tag(pb, "data"); + + put_flush_packet(pb); + + return 0; +} + +static int wav_write_packet(AVFormatContext *s, AVPacket *pkt) +{ + ByteIOContext *pb = &s->pb; + put_buffer(pb, pkt->data, pkt->size); + return 0; +} + +static int wav_write_trailer(AVFormatContext *s) +{ + ByteIOContext *pb = &s->pb; + WAVContext *wav = s->priv_data; + offset_t file_size; + + if (!url_is_streamed(&s->pb)) { + end_tag(pb, wav->data); + + /* update file size */ + file_size = url_ftell(pb); + url_fseek(pb, 4, SEEK_SET); + put_le32(pb, (uint32_t)(file_size - 8)); + url_fseek(pb, file_size, SEEK_SET); + + put_flush_packet(pb); + } + return 0; +} +#endif //CONFIG_MUXERS + +/* return the size of the found tag */ +/* XXX: > 2GB ? */ +static int find_tag(ByteIOContext *pb, uint32_t tag1) +{ + unsigned int tag; + int size; + + for(;;) { + if (url_feof(pb)) + return -1; + tag = get_le32(pb); + size = get_le32(pb); + if (tag == tag1) + break; + url_fseek(pb, size, SEEK_CUR); + } + if (size < 0) + size = 0x7fffffff; + return size; +} + +static int wav_probe(AVProbeData *p) +{ + /* check file header */ + if (p->buf_size <= 32) + return 0; + if (p->buf[0] == 'R' && p->buf[1] == 'I' && + p->buf[2] == 'F' && p->buf[3] == 'F' && + p->buf[8] == 'W' && p->buf[9] == 'A' && + p->buf[10] == 'V' && p->buf[11] == 'E') + return AVPROBE_SCORE_MAX; + else + return 0; +} + +/* wav input */ +static int wav_read_header(AVFormatContext *s, + AVFormatParameters *ap) +{ + int size; + unsigned int tag; + ByteIOContext *pb = &s->pb; + AVStream *st; + WAVContext *wav = s->priv_data; + + /* check RIFF header */ + tag = get_le32(pb); + + if (tag != MKTAG('R', 'I', 'F', 'F')) + return -1; + get_le32(pb); /* file size */ + tag = get_le32(pb); + if (tag != MKTAG('W', 'A', 'V', 'E')) + return -1; + + /* parse fmt header */ + size = find_tag(pb, MKTAG('f', 'm', 't', ' ')); + if (size < 0) + return -1; + st = av_new_stream(s, 0); + if (!st) + return AVERROR_NOMEM; + + get_wav_header(pb, st->codec, size); + st->need_parsing = 1; + + av_set_pts_info(st, 64, 1, st->codec->sample_rate); + + size = find_tag(pb, MKTAG('d', 'a', 't', 'a')); + if (size < 0) + return -1; + wav->data_end= url_ftell(pb) + size; + return 0; +} + +#define MAX_SIZE 4096 + +static int wav_read_packet(AVFormatContext *s, + AVPacket *pkt) +{ + int ret, size, left; + AVStream *st; + WAVContext *wav = s->priv_data; + + if (url_feof(&s->pb)) + return AVERROR_IO; + st = s->streams[0]; + + left= wav->data_end - url_ftell(&s->pb); + if(left <= 0){ + left = find_tag(&(s->pb), MKTAG('d', 'a', 't', 'a')); + if (left < 0) { + return AVERROR_IO; + } + wav->data_end= url_ftell(&s->pb) + left; + } + + size = MAX_SIZE; + if (st->codec->block_align > 1) { + if (size < st->codec->block_align) + size = st->codec->block_align; + size = (size / st->codec->block_align) * st->codec->block_align; + } + size= FFMIN(size, left); + if (av_new_packet(pkt, size)) + return AVERROR_IO; + pkt->stream_index = 0; + + ret = get_buffer(&s->pb, pkt->data, pkt->size); + if (ret < 0) + av_free_packet(pkt); + /* note: we need to modify the packet size here to handle the last + packet */ + pkt->size = ret; + return ret; +} + +static int wav_read_close(AVFormatContext *s) +{ + return 0; +} + +static int wav_read_seek(AVFormatContext *s, + int stream_index, int64_t timestamp, int flags) +{ + AVStream *st; + + st = s->streams[0]; + switch(st->codec->codec_id) { + case CODEC_ID_MP2: + case CODEC_ID_MP3: + case CODEC_ID_AC3: + case CODEC_ID_DTS: + /* use generic seeking with dynamically generated indexes */ + return -1; + default: + break; + } + return pcm_read_seek(s, stream_index, timestamp, flags); +} + +#ifdef CONFIG_WAV_DEMUXER +AVInputFormat wav_demuxer = { + "wav", + "wav format", + sizeof(WAVContext), + wav_probe, + wav_read_header, + wav_read_packet, + wav_read_close, + wav_read_seek, +}; +#endif +#ifdef CONFIG_WAV_MUXER +AVOutputFormat wav_muxer = { + "wav", + "wav format", + "audio/x-wav", + "wav", + sizeof(WAVContext), + CODEC_ID_PCM_S16LE, + CODEC_ID_NONE, + wav_write_header, + wav_write_packet, + wav_write_trailer, +}; +#endif |