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00022 #include "libavutil/crc.h"
00023 #include "libavcodec/xiph.h"
00024 #include "libavcodec/bytestream.h"
00025 #include "libavcodec/flac.h"
00026 #include "avformat.h"
00027 #include "internal.h"
00028 #include "vorbiscomment.h"
00029
00030 typedef struct {
00031 int64_t duration;
00032 unsigned page_counter;
00033 uint8_t *header[3];
00034 int header_len[3];
00036 int kfgshift;
00037 int64_t last_kf_pts;
00038 int vrev;
00039 int eos;
00040 unsigned packet_count;
00041 } OGGStreamContext;
00042
00043 static void ogg_update_checksum(AVFormatContext *s, int64_t crc_offset)
00044 {
00045 int64_t pos = url_ftell(s->pb);
00046 uint32_t checksum = get_checksum(s->pb);
00047 url_fseek(s->pb, crc_offset, SEEK_SET);
00048 put_be32(s->pb, checksum);
00049 url_fseek(s->pb, pos, SEEK_SET);
00050 }
00051
00052 static int ogg_write_page(AVFormatContext *s, const uint8_t *data, int size,
00053 int64_t granule, int stream_index, int flags)
00054 {
00055 OGGStreamContext *oggstream = s->streams[stream_index]->priv_data;
00056 int64_t crc_offset;
00057 int page_segments, i;
00058
00059 if (size >= 255*255) {
00060 granule = -1;
00061 size = 255*255;
00062 } else if (oggstream->eos)
00063 flags |= 4;
00064
00065 page_segments = FFMIN(size/255 + 1, 255);
00066
00067 init_checksum(s->pb, ff_crc04C11DB7_update, 0);
00068 put_tag(s->pb, "OggS");
00069 put_byte(s->pb, 0);
00070 put_byte(s->pb, flags);
00071 put_le64(s->pb, granule);
00072 put_le32(s->pb, stream_index);
00073 put_le32(s->pb, oggstream->page_counter++);
00074 crc_offset = url_ftell(s->pb);
00075 put_le32(s->pb, 0);
00076 put_byte(s->pb, page_segments);
00077 for (i = 0; i < page_segments-1; i++)
00078 put_byte(s->pb, 255);
00079 put_byte(s->pb, size - (page_segments-1)*255);
00080 put_buffer(s->pb, data, size);
00081
00082 ogg_update_checksum(s, crc_offset);
00083 put_flush_packet(s->pb);
00084 return size;
00085 }
00086
00087 static uint8_t *ogg_write_vorbiscomment(int offset, int bitexact,
00088 int *header_len, AVMetadata *m)
00089 {
00090 const char *vendor = bitexact ? "ffmpeg" : LIBAVFORMAT_IDENT;
00091 int size;
00092 uint8_t *p, *p0;
00093 unsigned int count;
00094
00095 size = offset + ff_vorbiscomment_length(m, vendor, &count);
00096 p = av_mallocz(size);
00097 if (!p)
00098 return NULL;
00099 p0 = p;
00100
00101 p += offset;
00102 ff_vorbiscomment_write(&p, m, vendor, count);
00103
00104 *header_len = size;
00105 return p0;
00106 }
00107
00108 static int ogg_build_flac_headers(AVCodecContext *avctx,
00109 OGGStreamContext *oggstream, int bitexact,
00110 AVMetadata *m)
00111 {
00112 enum FLACExtradataFormat format;
00113 uint8_t *streaminfo;
00114 uint8_t *p;
00115
00116 if (!ff_flac_is_extradata_valid(avctx, &format, &streaminfo))
00117 return -1;
00118
00119
00120 oggstream->header_len[0] = 51;
00121 oggstream->header[0] = av_mallocz(51);
00122 p = oggstream->header[0];
00123 if (!p)
00124 return AVERROR(ENOMEM);
00125 bytestream_put_byte(&p, 0x7F);
00126 bytestream_put_buffer(&p, "FLAC", 4);
00127 bytestream_put_byte(&p, 1);
00128 bytestream_put_byte(&p, 0);
00129 bytestream_put_be16(&p, 1);
00130 bytestream_put_buffer(&p, "fLaC", 4);
00131 bytestream_put_byte(&p, 0x00);
00132 bytestream_put_be24(&p, 34);
00133 bytestream_put_buffer(&p, streaminfo, FLAC_STREAMINFO_SIZE);
00134
00135
00136 p = ogg_write_vorbiscomment(4, bitexact, &oggstream->header_len[1], m);
00137 if (!p)
00138 return AVERROR(ENOMEM);
00139 oggstream->header[1] = p;
00140 bytestream_put_byte(&p, 0x84);
00141 bytestream_put_be24(&p, oggstream->header_len[1] - 4);
00142
00143 return 0;
00144 }
00145
00146 #define SPEEX_HEADER_SIZE 80
00147
00148 static int ogg_build_speex_headers(AVCodecContext *avctx,
00149 OGGStreamContext *oggstream, int bitexact,
00150 AVMetadata *m)
00151 {
00152 uint8_t *p;
00153
00154 if (avctx->extradata_size < SPEEX_HEADER_SIZE)
00155 return -1;
00156
00157
00158 p = av_mallocz(SPEEX_HEADER_SIZE);
00159 if (!p)
00160 return AVERROR(ENOMEM);
00161 oggstream->header[0] = p;
00162 oggstream->header_len[0] = SPEEX_HEADER_SIZE;
00163 bytestream_put_buffer(&p, avctx->extradata, SPEEX_HEADER_SIZE);
00164 AV_WL32(&oggstream->header[0][68], 0);
00165
00166
00167 p = ogg_write_vorbiscomment(0, bitexact, &oggstream->header_len[1], m);
00168 if (!p)
00169 return AVERROR(ENOMEM);
00170 oggstream->header[1] = p;
00171
00172 return 0;
00173 }
00174
00175 static int ogg_write_header(AVFormatContext *s)
00176 {
00177 OGGStreamContext *oggstream;
00178 int i, j;
00179 for (i = 0; i < s->nb_streams; i++) {
00180 AVStream *st = s->streams[i];
00181 if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO)
00182 av_set_pts_info(st, 64, 1, st->codec->sample_rate);
00183 else if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO)
00184 av_set_pts_info(st, 64, st->codec->time_base.num, st->codec->time_base.den);
00185 if (st->codec->codec_id != CODEC_ID_VORBIS &&
00186 st->codec->codec_id != CODEC_ID_THEORA &&
00187 st->codec->codec_id != CODEC_ID_SPEEX &&
00188 st->codec->codec_id != CODEC_ID_FLAC) {
00189 av_log(s, AV_LOG_ERROR, "Unsupported codec id in stream %d\n", i);
00190 return -1;
00191 }
00192
00193 if (!st->codec->extradata || !st->codec->extradata_size) {
00194 av_log(s, AV_LOG_ERROR, "No extradata present\n");
00195 return -1;
00196 }
00197 oggstream = av_mallocz(sizeof(*oggstream));
00198 st->priv_data = oggstream;
00199 if (st->codec->codec_id == CODEC_ID_FLAC) {
00200 int err = ogg_build_flac_headers(st->codec, oggstream,
00201 st->codec->flags & CODEC_FLAG_BITEXACT,
00202 s->metadata);
00203 if (err) {
00204 av_log(s, AV_LOG_ERROR, "Error writing FLAC headers\n");
00205 av_freep(&st->priv_data);
00206 return err;
00207 }
00208 } else if (st->codec->codec_id == CODEC_ID_SPEEX) {
00209 int err = ogg_build_speex_headers(st->codec, oggstream,
00210 st->codec->flags & CODEC_FLAG_BITEXACT,
00211 s->metadata);
00212 if (err) {
00213 av_log(s, AV_LOG_ERROR, "Error writing Speex headers\n");
00214 av_freep(&st->priv_data);
00215 return err;
00216 }
00217 } else {
00218 if (ff_split_xiph_headers(st->codec->extradata, st->codec->extradata_size,
00219 st->codec->codec_id == CODEC_ID_VORBIS ? 30 : 42,
00220 oggstream->header, oggstream->header_len) < 0) {
00221 av_log(s, AV_LOG_ERROR, "Extradata corrupted\n");
00222 av_freep(&st->priv_data);
00223 return -1;
00224 }
00225 if (st->codec->codec_id == CODEC_ID_THEORA) {
00228 oggstream->kfgshift = ((oggstream->header[0][40]&3)<<3)|(oggstream->header[0][41]>>5);
00229 oggstream->vrev = oggstream->header[0][9];
00230 av_log(s, AV_LOG_DEBUG, "theora kfgshift %d, vrev %d\n",
00231 oggstream->kfgshift, oggstream->vrev);
00232 }
00233 }
00234 }
00235 for (i = 0; i < 3; i++) {
00236 for (j = 0; j < s->nb_streams; j++) {
00237 AVStream *st = s->streams[j];
00238 OGGStreamContext *oggstream = st->priv_data;
00239 if (oggstream && oggstream->header_len[i]) {
00240 ogg_write_page(s, oggstream->header[i], oggstream->header_len[i],
00241 0, st->index, i ? 0 : 2);
00242 }
00243 }
00244 }
00245 return 0;
00246 }
00247
00248 static int ogg_write_packet(AVFormatContext *s, AVPacket *pkt)
00249 {
00250 AVStream *st = s->streams[pkt->stream_index];
00251 OGGStreamContext *oggstream = st->priv_data;
00252 uint8_t *ptr = pkt->data;
00253 int ret, size = pkt->size;
00254 int64_t granule;
00255
00256 if (st->codec->codec_id == CODEC_ID_THEORA) {
00257 int64_t pts = oggstream->vrev < 1 ? pkt->pts : pkt->pts + pkt->duration;
00258 int pframe_count;
00259 if (pkt->flags & AV_PKT_FLAG_KEY)
00260 oggstream->last_kf_pts = pts;
00261 pframe_count = pts - oggstream->last_kf_pts;
00262
00263 if (pframe_count >= (1<<oggstream->kfgshift)) {
00264 oggstream->last_kf_pts += pframe_count;
00265 pframe_count = 0;
00266 }
00267 granule = (oggstream->last_kf_pts<<oggstream->kfgshift) | pframe_count;
00268 } else
00269 granule = pkt->pts + pkt->duration;
00270 oggstream->duration = granule;
00271 do {
00272 ret = ogg_write_page(s, ptr, size, granule, pkt->stream_index, ptr != pkt->data);
00273 ptr += ret; size -= ret;
00274 } while (size > 0 || ret == 255*255);
00275
00276 return 0;
00277 }
00278
00279 static int ogg_compare_granule(AVFormatContext *s, AVPacket *next, AVPacket *pkt)
00280 {
00281 AVStream *st2 = s->streams[next->stream_index];
00282 AVStream *st = s->streams[pkt ->stream_index];
00283
00284 int64_t next_granule = av_rescale_q(next->pts + next->duration,
00285 st2->time_base, AV_TIME_BASE_Q);
00286 int64_t cur_granule = av_rescale_q(pkt ->pts + pkt ->duration,
00287 st ->time_base, AV_TIME_BASE_Q);
00288 return next_granule > cur_granule;
00289 }
00290
00291 static int ogg_interleave_per_granule(AVFormatContext *s, AVPacket *out, AVPacket *pkt, int flush)
00292 {
00293 OGGStreamContext *ogg;
00294 int i, stream_count = 0;
00295 int interleaved = 0;
00296
00297 if (pkt) {
00298 ff_interleave_add_packet(s, pkt, ogg_compare_granule);
00299 ogg = s->streams[pkt->stream_index]->priv_data;
00300 ogg->packet_count++;
00301 }
00302
00303 for (i = 0; i < s->nb_streams; i++) {
00304 ogg = s->streams[i]->priv_data;
00305 stream_count += !!ogg->packet_count;
00306 interleaved += ogg->packet_count > 1;
00307 }
00308
00309 if ((s->nb_streams == stream_count && interleaved == stream_count) ||
00310 (flush && stream_count)) {
00311 AVPacketList *pktl= s->packet_buffer;
00312 *out= pktl->pkt;
00313 s->packet_buffer = pktl->next;
00314
00315 ogg = s->streams[out->stream_index]->priv_data;
00316 if (flush && ogg->packet_count == 1)
00317 ogg->eos = 1;
00318 ogg->packet_count--;
00319
00320 if(!s->packet_buffer)
00321 s->packet_buffer_end= NULL;
00322
00323 if(s->streams[out->stream_index]->last_in_packet_buffer == pktl)
00324 s->streams[out->stream_index]->last_in_packet_buffer= NULL;
00325
00326 av_freep(&pktl);
00327 return 1;
00328 } else {
00329 av_init_packet(out);
00330 return 0;
00331 }
00332 }
00333
00334 static int ogg_write_trailer(AVFormatContext *s)
00335 {
00336 int i;
00337 for (i = 0; i < s->nb_streams; i++) {
00338 AVStream *st = s->streams[i];
00339 OGGStreamContext *oggstream = st->priv_data;
00340 if (st->codec->codec_id == CODEC_ID_FLAC ||
00341 st->codec->codec_id == CODEC_ID_SPEEX) {
00342 av_free(oggstream->header[0]);
00343 av_free(oggstream->header[1]);
00344 }
00345 av_freep(&st->priv_data);
00346 }
00347 return 0;
00348 }
00349
00350 AVOutputFormat ogg_muxer = {
00351 "ogg",
00352 NULL_IF_CONFIG_SMALL("Ogg"),
00353 "application/ogg",
00354 "ogg,ogv,spx",
00355 0,
00356 CODEC_ID_FLAC,
00357 CODEC_ID_THEORA,
00358 ogg_write_header,
00359 ogg_write_packet,
00360 ogg_write_trailer,
00361 .interleave_packet = ogg_interleave_per_granule,
00362 .metadata_conv = ff_vorbiscomment_metadata_conv,
00363 };