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00020
00021 #include "avformat.h"
00022 #include "raw.h"
00023 #include "riff.h"
00024
00025 typedef struct {
00026 offset_t data;
00027 offset_t data_end;
00028 int64_t minpts;
00029 int64_t maxpts;
00030 int last_duration;
00031 } WAVContext;
00032
00033 #ifdef CONFIG_MUXERS
00034 static int wav_write_header(AVFormatContext *s)
00035 {
00036 WAVContext *wav = s->priv_data;
00037 ByteIOContext *pb = s->pb;
00038 offset_t fmt, fact;
00039
00040 put_tag(pb, "RIFF");
00041 put_le32(pb, 0);
00042 put_tag(pb, "WAVE");
00043
00044
00045 fmt = start_tag(pb, "fmt ");
00046 if (put_wav_header(pb, s->streams[0]->codec) < 0) {
00047 av_free(wav);
00048 return -1;
00049 }
00050 end_tag(pb, fmt);
00051
00052 if(s->streams[0]->codec->codec_tag != 0x01
00053 && !url_is_streamed(s->pb)) {
00054 fact = start_tag(pb, "fact");
00055 put_le32(pb, 0);
00056 end_tag(pb, fact);
00057 }
00058
00059 av_set_pts_info(s->streams[0], 64, 1, s->streams[0]->codec->sample_rate);
00060 wav->maxpts = wav->last_duration = 0;
00061 wav->minpts = INT64_MAX;
00062
00063
00064 wav->data = start_tag(pb, "data");
00065
00066 put_flush_packet(pb);
00067
00068 return 0;
00069 }
00070
00071 static int wav_write_packet(AVFormatContext *s, AVPacket *pkt)
00072 {
00073 ByteIOContext *pb = s->pb;
00074 WAVContext *wav = s->priv_data;
00075 put_buffer(pb, pkt->data, pkt->size);
00076 if(pkt->pts != AV_NOPTS_VALUE) {
00077 wav->minpts = FFMIN(wav->minpts, pkt->pts);
00078 wav->maxpts = FFMAX(wav->maxpts, pkt->pts);
00079 wav->last_duration = pkt->duration;
00080 } else
00081 av_log(s, AV_LOG_ERROR, "wav_write_packet: NOPTS\n");
00082 return 0;
00083 }
00084
00085 static int wav_write_trailer(AVFormatContext *s)
00086 {
00087 ByteIOContext *pb = s->pb;
00088 WAVContext *wav = s->priv_data;
00089 offset_t file_size;
00090
00091 if (!url_is_streamed(s->pb)) {
00092 end_tag(pb, wav->data);
00093
00094
00095 file_size = url_ftell(pb);
00096 url_fseek(pb, 4, SEEK_SET);
00097 put_le32(pb, (uint32_t)(file_size - 8));
00098 url_fseek(pb, file_size, SEEK_SET);
00099
00100 put_flush_packet(pb);
00101
00102 if(s->streams[0]->codec->codec_tag != 0x01) {
00103
00104 int number_of_samples;
00105 number_of_samples = av_rescale(wav->maxpts - wav->minpts + wav->last_duration,
00106 s->streams[0]->codec->sample_rate * (int64_t)s->streams[0]->time_base.num,
00107 s->streams[0]->time_base.den);
00108 url_fseek(pb, wav->data-12, SEEK_SET);
00109 put_le32(pb, number_of_samples);
00110 url_fseek(pb, file_size, SEEK_SET);
00111 put_flush_packet(pb);
00112 }
00113 }
00114 return 0;
00115 }
00116 #endif //CONFIG_MUXERS
00117
00118
00119
00120 static int find_tag(ByteIOContext *pb, uint32_t tag1)
00121 {
00122 unsigned int tag;
00123 int size;
00124
00125 for(;;) {
00126 if (url_feof(pb))
00127 return -1;
00128 tag = get_le32(pb);
00129 size = get_le32(pb);
00130 if (tag == tag1)
00131 break;
00132 url_fseek(pb, size, SEEK_CUR);
00133 }
00134 if (size < 0)
00135 size = 0x7fffffff;
00136 return size;
00137 }
00138
00139 static int wav_probe(AVProbeData *p)
00140 {
00141
00142 if (p->buf_size <= 32)
00143 return 0;
00144 if (p->buf[0] == 'R' && p->buf[1] == 'I' &&
00145 p->buf[2] == 'F' && p->buf[3] == 'F' &&
00146 p->buf[8] == 'W' && p->buf[9] == 'A' &&
00147 p->buf[10] == 'V' && p->buf[11] == 'E')
00148 return AVPROBE_SCORE_MAX;
00149 else
00150 return 0;
00151 }
00152
00153
00154 static int wav_read_header(AVFormatContext *s,
00155 AVFormatParameters *ap)
00156 {
00157 int size;
00158 unsigned int tag;
00159 ByteIOContext *pb = s->pb;
00160 AVStream *st;
00161 WAVContext *wav = s->priv_data;
00162
00163
00164 tag = get_le32(pb);
00165
00166 if (tag != MKTAG('R', 'I', 'F', 'F'))
00167 return -1;
00168 get_le32(pb);
00169 tag = get_le32(pb);
00170 if (tag != MKTAG('W', 'A', 'V', 'E'))
00171 return -1;
00172
00173
00174 size = find_tag(pb, MKTAG('f', 'm', 't', ' '));
00175 if (size < 0)
00176 return -1;
00177 st = av_new_stream(s, 0);
00178 if (!st)
00179 return AVERROR(ENOMEM);
00180
00181 get_wav_header(pb, st->codec, size);
00182 st->need_parsing = AVSTREAM_PARSE_FULL;
00183
00184 av_set_pts_info(st, 64, 1, st->codec->sample_rate);
00185
00186 size = find_tag(pb, MKTAG('d', 'a', 't', 'a'));
00187 if (size < 0)
00188 return -1;
00189 wav->data_end= url_ftell(pb) + size;
00190 return 0;
00191 }
00192
00193 #define MAX_SIZE 4096
00194
00195 static int wav_read_packet(AVFormatContext *s,
00196 AVPacket *pkt)
00197 {
00198 int ret, size, left;
00199 AVStream *st;
00200 WAVContext *wav = s->priv_data;
00201
00202 if (url_feof(s->pb))
00203 return AVERROR(EIO);
00204 st = s->streams[0];
00205
00206 left= wav->data_end - url_ftell(s->pb);
00207 if(left <= 0){
00208 left = find_tag(s->pb, MKTAG('d', 'a', 't', 'a'));
00209 if (left < 0) {
00210 return AVERROR(EIO);
00211 }
00212 wav->data_end= url_ftell(s->pb) + left;
00213 }
00214
00215 size = MAX_SIZE;
00216 if (st->codec->block_align > 1) {
00217 if (size < st->codec->block_align)
00218 size = st->codec->block_align;
00219 size = (size / st->codec->block_align) * st->codec->block_align;
00220 }
00221 size= FFMIN(size, left);
00222 ret= av_get_packet(s->pb, pkt, size);
00223 if (ret <= 0)
00224 return AVERROR(EIO);
00225 pkt->stream_index = 0;
00226
00227
00228
00229 pkt->size = ret;
00230 return ret;
00231 }
00232
00233 static int wav_read_close(AVFormatContext *s)
00234 {
00235 return 0;
00236 }
00237
00238 static int wav_read_seek(AVFormatContext *s,
00239 int stream_index, int64_t timestamp, int flags)
00240 {
00241 AVStream *st;
00242
00243 st = s->streams[0];
00244 switch(st->codec->codec_id) {
00245 case CODEC_ID_MP2:
00246 case CODEC_ID_MP3:
00247 case CODEC_ID_AC3:
00248 case CODEC_ID_DTS:
00249
00250 return -1;
00251 default:
00252 break;
00253 }
00254 return pcm_read_seek(s, stream_index, timestamp, flags);
00255 }
00256
00257 #ifdef CONFIG_WAV_DEMUXER
00258 AVInputFormat wav_demuxer = {
00259 "wav",
00260 "wav format",
00261 sizeof(WAVContext),
00262 wav_probe,
00263 wav_read_header,
00264 wav_read_packet,
00265 wav_read_close,
00266 wav_read_seek,
00267 .flags= AVFMT_GENERIC_INDEX,
00268 .codec_tag= (const AVCodecTag*[]){codec_wav_tags, 0},
00269 };
00270 #endif
00271 #ifdef CONFIG_WAV_MUXER
00272 AVOutputFormat wav_muxer = {
00273 "wav",
00274 "wav format",
00275 "audio/x-wav",
00276 "wav",
00277 sizeof(WAVContext),
00278 CODEC_ID_PCM_S16LE,
00279 CODEC_ID_NONE,
00280 wav_write_header,
00281 wav_write_packet,
00282 wav_write_trailer,
00283 .codec_tag= (const AVCodecTag*[]){codec_wav_tags, 0},
00284 };
00285 #endif