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ffmpeg / libavformat / wav.c @ 591944cd

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1 115329f1 Diego Biurrun
/*
2 7fbde343 Aurelien Jacobs
 * WAV muxer and demuxer
3 e095026a Fabrice Bellard
 * Copyright (c) 2001, 2002 Fabrice Bellard.
4 de6d9b64 Fabrice Bellard
 *
5 b78e7197 Diego Biurrun
 * This file is part of FFmpeg.
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 *
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 * FFmpeg is free software; you can redistribute it and/or
8 19720f15 Fabrice Bellard
 * modify it under the terms of the GNU Lesser General Public
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 * License as published by the Free Software Foundation; either
10 b78e7197 Diego Biurrun
 * version 2.1 of the License, or (at your option) any later version.
11 de6d9b64 Fabrice Bellard
 *
12 b78e7197 Diego Biurrun
 * 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
18 b78e7197 Diego Biurrun
 * License along with FFmpeg; if not, write to the Free Software
19 5509bffa Diego Biurrun
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20 de6d9b64 Fabrice Bellard
 */
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#include "avformat.h"
22 7241a6bb Aurelien Jacobs
#include "raw.h"
23 9d9f4119 Måns Rullgård
#include "riff.h"
24 46a3d068 Fabrice Bellard
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typedef struct {
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    offset_t data;
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    offset_t data_end;
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    int64_t minpts;
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    int64_t maxpts;
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    int last_duration;
31 de6d9b64 Fabrice Bellard
} WAVContext;
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33 277e84f5 Gianluigi Tiesi
#ifdef CONFIG_MUXERS
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static int wav_write_header(AVFormatContext *s)
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{
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    WAVContext *wav = s->priv_data;
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    ByteIOContext *pb = s->pb;
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    offset_t fmt, fact;
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    put_tag(pb, "RIFF");
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    put_le32(pb, 0); /* file length */
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    put_tag(pb, "WAVE");
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    /* format header */
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    fmt = start_tag(pb, "fmt ");
46 01f4895c Michael Niedermayer
    if (put_wav_header(pb, s->streams[0]->codec) < 0) {
47 1ea4f593 Fabrice Bellard
        av_free(wav);
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        return -1;
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    }
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    end_tag(pb, fmt);
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    if(s->streams[0]->codec->codec_tag != 0x01 /* hence for all other than PCM */
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       && !url_is_streamed(s->pb)) {
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        fact = start_tag(pb, "fact");
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        put_le32(pb, 0);
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        end_tag(pb, fact);
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    }
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    av_set_pts_info(s->streams[0], 64, 1, s->streams[0]->codec->sample_rate);
60 d794d388 Michel Bardiaux
    wav->maxpts = wav->last_duration = 0;
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    wav->minpts = INT64_MAX;
62 a1e568bd Michael Niedermayer
63 de6d9b64 Fabrice Bellard
    /* data header */
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    wav->data = start_tag(pb, "data");
65 115329f1 Diego Biurrun
66 de6d9b64 Fabrice Bellard
    put_flush_packet(pb);
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    return 0;
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}
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71 e928649b Michael Niedermayer
static int wav_write_packet(AVFormatContext *s, AVPacket *pkt)
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{
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    ByteIOContext *pb = s->pb;
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    WAVContext *wav = s->priv_data;
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    put_buffer(pb, pkt->data, pkt->size);
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    if(pkt->pts != AV_NOPTS_VALUE) {
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        wav->minpts = FFMIN(wav->minpts, pkt->pts);
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        wav->maxpts = FFMAX(wav->maxpts, pkt->pts);
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        wav->last_duration = pkt->duration;
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    } else
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        av_log(s, AV_LOG_ERROR, "wav_write_packet: NOPTS\n");
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    return 0;
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}
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static int wav_write_trailer(AVFormatContext *s)
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{
87 899681cd Björn Axelsson
    ByteIOContext *pb = s->pb;
88 de6d9b64 Fabrice Bellard
    WAVContext *wav = s->priv_data;
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    offset_t file_size;
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91 899681cd Björn Axelsson
    if (!url_is_streamed(s->pb)) {
92 de6d9b64 Fabrice Bellard
        end_tag(pb, wav->data);
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        /* update file size */
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        file_size = url_ftell(pb);
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        url_fseek(pb, 4, SEEK_SET);
97 0c1a9eda Zdenek Kabelac
        put_le32(pb, (uint32_t)(file_size - 8));
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        url_fseek(pb, file_size, SEEK_SET);
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        put_flush_packet(pb);
101 d794d388 Michel Bardiaux
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        if(s->streams[0]->codec->codec_tag != 0x01) {
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            /* Update num_samps in fact chunk */
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            int number_of_samples;
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            number_of_samples = av_rescale(wav->maxpts - wav->minpts + wav->last_duration,
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                                           s->streams[0]->codec->sample_rate * (int64_t)s->streams[0]->time_base.num,
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                                           s->streams[0]->time_base.den);
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            url_fseek(pb, wav->data-12, SEEK_SET);
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            put_le32(pb, number_of_samples);
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            url_fseek(pb, file_size, SEEK_SET);
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            put_flush_packet(pb);
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        }
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    }
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    return 0;
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}
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#endif //CONFIG_MUXERS
117 de6d9b64 Fabrice Bellard
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/* return the size of the found tag */
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/* XXX: > 2GB ? */
120 0c1a9eda Zdenek Kabelac
static int find_tag(ByteIOContext *pb, uint32_t tag1)
121 de6d9b64 Fabrice Bellard
{
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    unsigned int tag;
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    int size;
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    for(;;) {
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        if (url_feof(pb))
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            return -1;
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        tag = get_le32(pb);
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        size = get_le32(pb);
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        if (tag == tag1)
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            break;
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        url_fseek(pb, size, SEEK_CUR);
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    }
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    if (size < 0)
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        size = 0x7fffffff;
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    return size;
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}
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static int wav_probe(AVProbeData *p)
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{
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    /* check file header */
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    if (p->buf_size <= 32)
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        return 0;
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    if (p->buf[0] == 'R' && p->buf[1] == 'I' &&
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        p->buf[2] == 'F' && p->buf[3] == 'F' &&
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        p->buf[8] == 'W' && p->buf[9] == 'A' &&
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        p->buf[10] == 'V' && p->buf[11] == 'E')
148 c6cd525a Vladimir Voroshilov
        /*
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          Since ACT demuxer has standard WAV header at top of it's own,
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          returning score is decreased to avoid probe conflict
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          between ACT and WAV.
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        */
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        return AVPROBE_SCORE_MAX - 1;
154 c9a65ca8 Fabrice Bellard
    else
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        return 0;
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}
157
158 de6d9b64 Fabrice Bellard
/* wav input */
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static int wav_read_header(AVFormatContext *s,
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                           AVFormatParameters *ap)
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{
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    int size;
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    unsigned int tag;
164 899681cd Björn Axelsson
    ByteIOContext *pb = s->pb;
165 de6d9b64 Fabrice Bellard
    AVStream *st;
166 b582d7ba Michael Niedermayer
    WAVContext *wav = s->priv_data;
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    /* check RIFF header */
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    tag = get_le32(pb);
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    if (tag != MKTAG('R', 'I', 'F', 'F'))
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        return -1;
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    get_le32(pb); /* file size */
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    tag = get_le32(pb);
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    if (tag != MKTAG('W', 'A', 'V', 'E'))
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        return -1;
177 115329f1 Diego Biurrun
178 de6d9b64 Fabrice Bellard
    /* parse fmt header */
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    size = find_tag(pb, MKTAG('f', 'm', 't', ' '));
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    if (size < 0)
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        return -1;
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    st = av_new_stream(s, 0);
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    if (!st)
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        return AVERROR(ENOMEM);
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    get_wav_header(pb, st->codec, size);
187 57004ff1 Aurelien Jacobs
    st->need_parsing = AVSTREAM_PARSE_FULL;
188 595bf4ef Michael Niedermayer
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    av_set_pts_info(st, 64, 1, st->codec->sample_rate);
190 595bf4ef Michael Niedermayer
191 e095026a Fabrice Bellard
    size = find_tag(pb, MKTAG('d', 'a', 't', 'a'));
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    if (size < 0)
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        return -1;
194 b582d7ba Michael Niedermayer
    wav->data_end= url_ftell(pb) + size;
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    return 0;
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}
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#define MAX_SIZE 4096
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static int wav_read_packet(AVFormatContext *s,
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                           AVPacket *pkt)
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{
203 b582d7ba Michael Niedermayer
    int ret, size, left;
204 f9b5459e Fabrice Bellard
    AVStream *st;
205 b582d7ba Michael Niedermayer
    WAVContext *wav = s->priv_data;
206 de6d9b64 Fabrice Bellard
207 899681cd Björn Axelsson
    if (url_feof(s->pb))
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        return AVERROR(EIO);
209 f9b5459e Fabrice Bellard
    st = s->streams[0];
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211 899681cd Björn Axelsson
    left= wav->data_end - url_ftell(s->pb);
212 b582d7ba Michael Niedermayer
    if(left <= 0){
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        left = find_tag(s->pb, MKTAG('d', 'a', 't', 'a'));
214 b582d7ba Michael Niedermayer
        if (left < 0) {
215 6f3e0b21 Panagiotis Issaris
            return AVERROR(EIO);
216 b582d7ba Michael Niedermayer
        }
217 899681cd Björn Axelsson
        wav->data_end= url_ftell(s->pb) + left;
218 b582d7ba Michael Niedermayer
    }
219
220 f9b5459e Fabrice Bellard
    size = MAX_SIZE;
221 01f4895c Michael Niedermayer
    if (st->codec->block_align > 1) {
222
        if (size < st->codec->block_align)
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            size = st->codec->block_align;
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        size = (size / st->codec->block_align) * st->codec->block_align;
225 f9b5459e Fabrice Bellard
    }
226 b582d7ba Michael Niedermayer
    size= FFMIN(size, left);
227 899681cd Björn Axelsson
    ret= av_get_packet(s->pb, pkt, size);
228 e9b78eeb Michael Niedermayer
    if (ret <= 0)
229 6f3e0b21 Panagiotis Issaris
        return AVERROR(EIO);
230 de6d9b64 Fabrice Bellard
    pkt->stream_index = 0;
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232 5ed8fafc Fabrice Bellard
    /* note: we need to modify the packet size here to handle the last
233
       packet */
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    pkt->size = ret;
235 de6d9b64 Fabrice Bellard
    return ret;
236
}
237
238
static int wav_read_close(AVFormatContext *s)
239
{
240
    return 0;
241
}
242
243 115329f1 Diego Biurrun
static int wav_read_seek(AVFormatContext *s,
244 7b3c1382 Michael Niedermayer
                         int stream_index, int64_t timestamp, int flags)
245 f9b5459e Fabrice Bellard
{
246
    AVStream *st;
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248
    st = s->streams[0];
249 01f4895c Michael Niedermayer
    switch(st->codec->codec_id) {
250 f9b5459e Fabrice Bellard
    case CODEC_ID_MP2:
251
    case CODEC_ID_MP3:
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    case CODEC_ID_AC3:
253 23c99253 Michael Niedermayer
    case CODEC_ID_DTS:
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        /* use generic seeking with dynamically generated indexes */
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        return -1;
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    default:
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        break;
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    }
259 7b3c1382 Michael Niedermayer
    return pcm_read_seek(s, stream_index, timestamp, flags);
260 f9b5459e Fabrice Bellard
}
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262 ff70e601 Måns Rullgård
#ifdef CONFIG_WAV_DEMUXER
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AVInputFormat wav_demuxer = {
264 c9a65ca8 Fabrice Bellard
    "wav",
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    "wav format",
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    sizeof(WAVContext),
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    wav_probe,
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    wav_read_header,
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    wav_read_packet,
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    wav_read_close,
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    wav_read_seek,
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    .flags= AVFMT_GENERIC_INDEX,
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    .codec_tag= (const AVCodecTag*[]){codec_wav_tags, 0},
274 c9a65ca8 Fabrice Bellard
};
275 ff70e601 Måns Rullgård
#endif
276
#ifdef CONFIG_WAV_MUXER
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AVOutputFormat wav_muxer = {
278 de6d9b64 Fabrice Bellard
    "wav",
279
    "wav format",
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    "audio/x-wav",
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    "wav",
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    sizeof(WAVContext),
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    CODEC_ID_PCM_S16LE,
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    CODEC_ID_NONE,
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    wav_write_header,
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    wav_write_packet,
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    wav_write_trailer,
288 6c77805f Michael Niedermayer
    .codec_tag= (const AVCodecTag*[]){codec_wav_tags, 0},
289 de6d9b64 Fabrice Bellard
};
290 ff70e601 Måns Rullgård
#endif