FFmpeg: libavformat/wav.c Source File

00001 /*
00002  * WAV muxer and demuxer
00003  * Copyright (c) 2001, 2002 Fabrice Bellard
00004  *
00005  * Sony Wave64 demuxer
00006  * RF64 demuxer
00007  * Copyright (c) 2009 Daniel Verkamp
00008  *
00009  * This file is part of FFmpeg.
00010  *
00011  * FFmpeg is free software; you can redistribute it and/or
00012  * modify it under the terms of the GNU Lesser General Public
00013  * License as published by the Free Software Foundation; either
00014  * version 2.1 of the License, or (at your option) any later version.
00015  *
00016  * FFmpeg is distributed in the hope that it will be useful,
00017  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00018  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00019  * Lesser General Public License for more details.
00020  *
00021  * You should have received a copy of the GNU Lesser General Public
00022  * License along with FFmpeg; if not, write to the Free Software
00023  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
00024  */
00025 #include "avformat.h"
00026 #include "pcm.h"
00027 #include "riff.h"
00028 
00029 typedef struct {
00030     int64_t data;
00031     int64_t data_end;
00032     int64_t minpts;
00033     int64_t maxpts;
00034     int last_duration;
00035     int w64;
00036 } WAVContext;
00037 
00038 #if CONFIG_WAV_MUXER
00039 static int wav_write_header(AVFormatContext *s)
00040 {
00041     WAVContext *wav = s->priv_data;
00042     ByteIOContext *pb = s->pb;
00043     int64_t fmt, fact;
00044 
00045     put_tag(pb, "RIFF");
00046     put_le32(pb, 0); /* file length */
00047     put_tag(pb, "WAVE");
00048 
00049     /* format header */
00050     fmt = ff_start_tag(pb, "fmt ");
00051     if (ff_put_wav_header(pb, s->streams[0]->codec) < 0) {
00052         av_log(s, AV_LOG_ERROR, "%s codec not supported in WAVE format\n",
00053                s->streams[0]->codec->codec ? s->streams[0]->codec->codec->name : "NONE");
00054         av_free(wav);
00055         return -1;
00056     }
00057     ff_end_tag(pb, fmt);
00058 
00059     if (s->streams[0]->codec->codec_tag != 0x01 /* hence for all other than PCM */
00060         && !url_is_streamed(s->pb)) {
00061         fact = ff_start_tag(pb, "fact");
00062         put_le32(pb, 0);
00063         ff_end_tag(pb, fact);
00064     }
00065 
00066     av_set_pts_info(s->streams[0], 64, 1, s->streams[0]->codec->sample_rate);
00067     wav->maxpts = wav->last_duration = 0;
00068     wav->minpts = INT64_MAX;
00069 
00070     /* data header */
00071     wav->data = ff_start_tag(pb, "data");
00072 
00073     put_flush_packet(pb);
00074 
00075     return 0;
00076 }
00077 
00078 static int wav_write_packet(AVFormatContext *s, AVPacket *pkt)
00079 {
00080     ByteIOContext *pb  = s->pb;
00081     WAVContext    *wav = s->priv_data;
00082     put_buffer(pb, pkt->data, pkt->size);
00083     if(pkt->pts != AV_NOPTS_VALUE) {
00084         wav->minpts        = FFMIN(wav->minpts, pkt->pts);
00085         wav->maxpts        = FFMAX(wav->maxpts, pkt->pts);
00086         wav->last_duration = pkt->duration;
00087     } else
00088         av_log(s, AV_LOG_ERROR, "wav_write_packet: NOPTS\n");
00089     return 0;
00090 }
00091 
00092 static int wav_write_trailer(AVFormatContext *s)
00093 {
00094     ByteIOContext *pb  = s->pb;
00095     WAVContext    *wav = s->priv_data;
00096     int64_t file_size;
00097 
00098     put_flush_packet(pb);
00099 
00100     if (!url_is_streamed(s->pb)) {
00101         ff_end_tag(pb, wav->data);
00102 
00103         /* update file size */
00104         file_size = url_ftell(pb);
00105         url_fseek(pb, 4, SEEK_SET);
00106         put_le32(pb, (uint32_t)(file_size - 8));
00107         url_fseek(pb, file_size, SEEK_SET);
00108 
00109         put_flush_packet(pb);
00110 
00111         if(s->streams[0]->codec->codec_tag != 0x01) {
00112             /* Update num_samps in fact chunk */
00113             int number_of_samples;
00114             number_of_samples = av_rescale(wav->maxpts - wav->minpts + wav->last_duration,
00115                                            s->streams[0]->codec->sample_rate * (int64_t)s->streams[0]->time_base.num,
00116                                            s->streams[0]->time_base.den);
00117             url_fseek(pb, wav->data-12, SEEK_SET);
00118             put_le32(pb, number_of_samples);
00119             url_fseek(pb, file_size, SEEK_SET);
00120             put_flush_packet(pb);
00121         }
00122     }
00123     return 0;
00124 }
00125 
00126 AVOutputFormat wav_muxer = {
00127     "wav",
00128     NULL_IF_CONFIG_SMALL("WAV format"),
00129     "audio/x-wav",
00130     "wav",
00131     sizeof(WAVContext),
00132     CODEC_ID_PCM_S16LE,
00133     CODEC_ID_NONE,
00134     wav_write_header,
00135     wav_write_packet,
00136     wav_write_trailer,
00137     .codec_tag= (const AVCodecTag* const []){ff_codec_wav_tags, 0},
00138 };
00139 #endif /* CONFIG_WAV_MUXER */
00140 
00141 
00142 #if CONFIG_WAV_DEMUXER
00143 
00144 static int64_t next_tag(ByteIOContext *pb, unsigned int *tag)
00145 {
00146     *tag = get_le32(pb);
00147     return get_le32(pb);
00148 }
00149 
00150 /* return the size of the found tag */
00151 static int64_t find_tag(ByteIOContext *pb, uint32_t tag1)
00152 {
00153     unsigned int tag;
00154     int64_t size;
00155 
00156     for (;;) {
00157         if (url_feof(pb))
00158             return -1;
00159         size = next_tag(pb, &tag);
00160         if (tag == tag1)
00161             break;
00162         url_fseek(pb, size, SEEK_CUR);
00163     }
00164     return size;
00165 }
00166 
00167 static int wav_probe(AVProbeData *p)
00168 {
00169     /* check file header */
00170     if (p->buf_size <= 32)
00171         return 0;
00172     if (!memcmp(p->buf + 8, "WAVE", 4)) {
00173         if (!memcmp(p->buf, "RIFF", 4))
00174             /*
00175               Since ACT demuxer has standard WAV header at top of it's own,
00176               returning score is decreased to avoid probe conflict
00177               between ACT and WAV.
00178             */
00179             return AVPROBE_SCORE_MAX - 1;
00180         else if (!memcmp(p->buf,      "RF64", 4) &&
00181                  !memcmp(p->buf + 12, "ds64", 4))
00182             return AVPROBE_SCORE_MAX;
00183     }
00184     return 0;
00185 }
00186 
00187 /* wav input */
00188 static int wav_read_header(AVFormatContext *s,
00189                            AVFormatParameters *ap)
00190 {
00191     int64_t size, av_uninit(data_size);
00192     int64_t sample_count=0;
00193     int rf64;
00194     unsigned int tag;
00195     ByteIOContext *pb = s->pb;
00196     AVStream *st;
00197     WAVContext *wav = s->priv_data;
00198 
00199     /* check RIFF header */
00200     tag = get_le32(pb);
00201 
00202     rf64 = tag == MKTAG('R', 'F', '6', '4');
00203     if (!rf64 && tag != MKTAG('R', 'I', 'F', 'F'))
00204         return -1;
00205     get_le32(pb); /* file size */
00206     tag = get_le32(pb);
00207     if (tag != MKTAG('W', 'A', 'V', 'E'))
00208         return -1;
00209 
00210     if (rf64) {
00211         if (get_le32(pb) != MKTAG('d', 's', '6', '4'))
00212             return -1;
00213         size = get_le32(pb);
00214         if (size < 16)
00215             return -1;
00216         get_le64(pb); /* RIFF size */
00217         data_size = get_le64(pb);
00218         sample_count = get_le64(pb);
00219         url_fskip(pb, size - 16); /* skip rest of ds64 chunk */
00220     }
00221 
00222     /* parse fmt header */
00223     size = find_tag(pb, MKTAG('f', 'm', 't', ' '));
00224     if (size < 0)
00225         return -1;
00226     st = av_new_stream(s, 0);
00227     if (!st)
00228         return AVERROR(ENOMEM);
00229 
00230     ff_get_wav_header(pb, st->codec, size);
00231     st->need_parsing = AVSTREAM_PARSE_FULL;
00232 
00233     av_set_pts_info(st, 64, 1, st->codec->sample_rate);
00234 
00235     for (;;) {
00236         if (url_feof(pb))
00237             return -1;
00238         size = next_tag(pb, &tag);
00239         if (tag == MKTAG('d', 'a', 't', 'a')){
00240             break;
00241         }else if (tag == MKTAG('f','a','c','t') && !sample_count){
00242             sample_count = get_le32(pb);
00243             size -= 4;
00244         }
00245         url_fseek(pb, size, SEEK_CUR);
00246     }
00247     if (rf64)
00248         size = data_size;
00249     if (size < 0)
00250         return -1;
00251     if (!size) {
00252         wav->data_end = INT64_MAX;
00253     } else
00254         wav->data_end= url_ftell(pb) + size;
00255 
00256     if (!sample_count && st->codec->channels && av_get_bits_per_sample(st->codec->codec_id))
00257         sample_count = (size<<3) / (st->codec->channels * (uint64_t)av_get_bits_per_sample(st->codec->codec_id));
00258     if (sample_count)
00259         st->duration = sample_count;
00260     return 0;
00261 }
00262 
00266 static int64_t find_guid(ByteIOContext *pb, const uint8_t guid1[16])
00267 {
00268     uint8_t guid[16];
00269     int64_t size;
00270 
00271     while (!url_feof(pb)) {
00272         get_buffer(pb, guid, 16);
00273         size = get_le64(pb);
00274         if (size <= 24)
00275             return -1;
00276         if (!memcmp(guid, guid1, 16))
00277             return size;
00278         url_fskip(pb, FFALIGN(size, INT64_C(8)) - 24);
00279     }
00280     return -1;
00281 }
00282 
00283 static const uint8_t guid_data[16] = { 'd', 'a', 't', 'a',
00284     0xF3, 0xAC, 0xD3, 0x11, 0x8C, 0xD1, 0x00, 0xC0, 0x4F, 0x8E, 0xDB, 0x8A };
00285 
00286 #define MAX_SIZE 4096
00287 
00288 static int wav_read_packet(AVFormatContext *s,
00289                            AVPacket *pkt)
00290 {
00291     int ret, size;
00292     int64_t left;
00293     AVStream *st;
00294     WAVContext *wav = s->priv_data;
00295 
00296     st = s->streams[0];
00297 
00298     left = wav->data_end - url_ftell(s->pb);
00299     if (left <= 0){
00300         if (CONFIG_W64_DEMUXER && wav->w64)
00301             left = find_guid(s->pb, guid_data) - 24;
00302         else
00303             left = find_tag(s->pb, MKTAG('d', 'a', 't', 'a'));
00304         if (left < 0)
00305             return AVERROR_EOF;
00306         wav->data_end= url_ftell(s->pb) + left;
00307     }
00308 
00309     size = MAX_SIZE;
00310     if (st->codec->block_align > 1) {
00311         if (size < st->codec->block_align)
00312             size = st->codec->block_align;
00313         size = (size / st->codec->block_align) * st->codec->block_align;
00314     }
00315     size = FFMIN(size, left);
00316     ret  = av_get_packet(s->pb, pkt, size);
00317     if (ret < 0)
00318         return ret;
00319     pkt->stream_index = 0;
00320 
00321     return ret;
00322 }
00323 
00324 static int wav_read_seek(AVFormatContext *s,
00325                          int stream_index, int64_t timestamp, int flags)
00326 {
00327     AVStream *st;
00328 
00329     st = s->streams[0];
00330     switch (st->codec->codec_id) {
00331     case CODEC_ID_MP2:
00332     case CODEC_ID_MP3:
00333     case CODEC_ID_AC3:
00334     case CODEC_ID_DTS:
00335         /* use generic seeking with dynamically generated indexes */
00336         return -1;
00337     default:
00338         break;
00339     }
00340     return pcm_read_seek(s, stream_index, timestamp, flags);
00341 }
00342 
00343 AVInputFormat wav_demuxer = {
00344     "wav",
00345     NULL_IF_CONFIG_SMALL("WAV format"),
00346     sizeof(WAVContext),
00347     wav_probe,
00348     wav_read_header,
00349     wav_read_packet,
00350     NULL,
00351     wav_read_seek,
00352     .flags= AVFMT_GENERIC_INDEX,
00353     .codec_tag= (const AVCodecTag* const []){ff_codec_wav_tags, 0},
00354 };
00355 #endif /* CONFIG_WAV_DEMUXER */
00356 
00357 
00358 #if CONFIG_W64_DEMUXER
00359 static const uint8_t guid_riff[16] = { 'r', 'i', 'f', 'f',
00360     0x2E, 0x91, 0xCF, 0x11, 0xA5, 0xD6, 0x28, 0xDB, 0x04, 0xC1, 0x00, 0x00 };
00361 
00362 static const uint8_t guid_wave[16] = { 'w', 'a', 'v', 'e',
00363     0xF3, 0xAC, 0xD3, 0x11, 0x8C, 0xD1, 0x00, 0xC0, 0x4F, 0x8E, 0xDB, 0x8A };
00364 
00365 static const uint8_t guid_fmt [16] = { 'f', 'm', 't', ' ',
00366     0xF3, 0xAC, 0xD3, 0x11, 0x8C, 0xD1, 0x00, 0xC0, 0x4F, 0x8E, 0xDB, 0x8A };
00367 
00368 static int w64_probe(AVProbeData *p)
00369 {
00370     if (p->buf_size <= 40)
00371         return 0;
00372     if (!memcmp(p->buf,      guid_riff, 16) &&
00373         !memcmp(p->buf + 24, guid_wave, 16))
00374         return AVPROBE_SCORE_MAX;
00375     else
00376         return 0;
00377 }
00378 
00379 static int w64_read_header(AVFormatContext *s, AVFormatParameters *ap)
00380 {
00381     int64_t size;
00382     ByteIOContext *pb  = s->pb;
00383     WAVContext    *wav = s->priv_data;
00384     AVStream *st;
00385     uint8_t guid[16];
00386 
00387     get_buffer(pb, guid, 16);
00388     if (memcmp(guid, guid_riff, 16))
00389         return -1;
00390 
00391     if (get_le64(pb) < 16 + 8 + 16 + 8 + 16 + 8) /* riff + wave + fmt + sizes */
00392         return -1;
00393 
00394     get_buffer(pb, guid, 16);
00395     if (memcmp(guid, guid_wave, 16)) {
00396         av_log(s, AV_LOG_ERROR, "could not find wave guid\n");
00397         return -1;
00398     }
00399 
00400     size = find_guid(pb, guid_fmt);
00401     if (size < 0) {
00402         av_log(s, AV_LOG_ERROR, "could not find fmt guid\n");
00403         return -1;
00404     }
00405 
00406     st = av_new_stream(s, 0);
00407     if (!st)
00408         return AVERROR(ENOMEM);
00409 
00410     /* subtract chunk header size - normal wav file doesn't count it */
00411     ff_get_wav_header(pb, st->codec, size - 24);
00412     url_fskip(pb, FFALIGN(size, INT64_C(8)) - size);
00413 
00414     st->need_parsing = AVSTREAM_PARSE_FULL;
00415 
00416     av_set_pts_info(st, 64, 1, st->codec->sample_rate);
00417 
00418     size = find_guid(pb, guid_data);
00419     if (size < 0) {
00420         av_log(s, AV_LOG_ERROR, "could not find data guid\n");
00421         return -1;
00422     }
00423     wav->data_end = url_ftell(pb) + size - 24;
00424     wav->w64      = 1;
00425 
00426     return 0;
00427 }
00428 
00429 AVInputFormat w64_demuxer = {
00430     "w64",
00431     NULL_IF_CONFIG_SMALL("Sony Wave64 format"),
00432     sizeof(WAVContext),
00433     w64_probe,
00434     w64_read_header,
00435     wav_read_packet,
00436     NULL,
00437     wav_read_seek,
00438     .flags = AVFMT_GENERIC_INDEX,
00439     .codec_tag = (const AVCodecTag* const []){ff_codec_wav_tags, 0},
00440 };
00441 #endif /* CONFIG_W64_DEMUXER */