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00022 #include "libavutil/crc.h"
00023 #include "libavutil/mathematics.h"
00024 #include "libavutil/random_seed.h"
00025 #include "libavcodec/xiph.h"
00026 #include "libavcodec/bytestream.h"
00027 #include "libavcodec/flac.h"
00028 #include "avformat.h"
00029 #include "avio_internal.h"
00030 #include "internal.h"
00031 #include "vorbiscomment.h"
00032
00033 #define MAX_PAGE_SIZE 65025
00034
00035 typedef struct {
00036 int64_t granule;
00037 int stream_index;
00038 uint8_t flags;
00039 uint8_t segments_count;
00040 uint8_t segments[255];
00041 uint8_t data[MAX_PAGE_SIZE];
00042 uint16_t size;
00043 } OGGPage;
00044
00045 typedef struct {
00046 unsigned page_counter;
00047 uint8_t *header[3];
00048 int header_len[3];
00050 int kfgshift;
00051 int64_t last_kf_pts;
00052 int vrev;
00053 int eos;
00054 unsigned page_count;
00055 OGGPage page;
00056 unsigned serial_num;
00057 int64_t last_granule;
00058 } OGGStreamContext;
00059
00060 typedef struct OGGPageList {
00061 OGGPage page;
00062 struct OGGPageList *next;
00063 } OGGPageList;
00064
00065 typedef struct {
00066 OGGPageList *page_list;
00067 } OGGContext;
00068
00069 static void ogg_update_checksum(AVFormatContext *s, AVIOContext *pb, int64_t crc_offset)
00070 {
00071 int64_t pos = avio_tell(pb);
00072 uint32_t checksum = ffio_get_checksum(pb);
00073 avio_seek(pb, crc_offset, SEEK_SET);
00074 avio_wb32(pb, checksum);
00075 avio_seek(pb, pos, SEEK_SET);
00076 }
00077
00078 static int ogg_write_page(AVFormatContext *s, OGGPage *page, int extra_flags)
00079 {
00080 OGGStreamContext *oggstream = s->streams[page->stream_index]->priv_data;
00081 AVIOContext *pb;
00082 int64_t crc_offset;
00083 int ret, size;
00084 uint8_t *buf;
00085
00086 ret = avio_open_dyn_buf(&pb);
00087 if (ret < 0)
00088 return ret;
00089 ffio_init_checksum(pb, ff_crc04C11DB7_update, 0);
00090 ffio_wfourcc(pb, "OggS");
00091 avio_w8(pb, 0);
00092 avio_w8(pb, page->flags | extra_flags);
00093 avio_wl64(pb, page->granule);
00094 avio_wl32(pb, oggstream->serial_num);
00095 avio_wl32(pb, oggstream->page_counter++);
00096 crc_offset = avio_tell(pb);
00097 avio_wl32(pb, 0);
00098 avio_w8(pb, page->segments_count);
00099 avio_write(pb, page->segments, page->segments_count);
00100 avio_write(pb, page->data, page->size);
00101
00102 ogg_update_checksum(s, pb, crc_offset);
00103 avio_flush(pb);
00104
00105 size = avio_close_dyn_buf(pb, &buf);
00106 if (size < 0)
00107 return size;
00108
00109 avio_write(s->pb, buf, size);
00110 avio_flush(s->pb);
00111 av_free(buf);
00112 oggstream->page_count--;
00113 return 0;
00114 }
00115
00116 static int64_t ogg_granule_to_timestamp(OGGStreamContext *oggstream, int64_t granule)
00117 {
00118 if (oggstream->kfgshift)
00119 return (granule>>oggstream->kfgshift) +
00120 (granule & ((1<<oggstream->kfgshift)-1));
00121 else
00122 return granule;
00123 }
00124
00125 static int ogg_compare_granule(AVFormatContext *s, OGGPage *next, OGGPage *page)
00126 {
00127 AVStream *st2 = s->streams[next->stream_index];
00128 AVStream *st = s->streams[page->stream_index];
00129 int64_t next_granule, cur_granule;
00130
00131 if (next->granule == -1 || page->granule == -1)
00132 return 0;
00133
00134 next_granule = av_rescale_q(ogg_granule_to_timestamp(st2->priv_data, next->granule),
00135 st2->time_base, AV_TIME_BASE_Q);
00136 cur_granule = av_rescale_q(ogg_granule_to_timestamp(st->priv_data, page->granule),
00137 st ->time_base, AV_TIME_BASE_Q);
00138 return next_granule > cur_granule;
00139 }
00140
00141 static int ogg_reset_cur_page(OGGStreamContext *oggstream)
00142 {
00143 oggstream->page.granule = -1;
00144 oggstream->page.flags = 0;
00145 oggstream->page.segments_count = 0;
00146 oggstream->page.size = 0;
00147 return 0;
00148 }
00149
00150 static int ogg_buffer_page(AVFormatContext *s, OGGStreamContext *oggstream)
00151 {
00152 OGGContext *ogg = s->priv_data;
00153 OGGPageList **p = &ogg->page_list;
00154 OGGPageList *l = av_mallocz(sizeof(*l));
00155
00156 if (!l)
00157 return AVERROR(ENOMEM);
00158 l->page = oggstream->page;
00159
00160 oggstream->page_count++;
00161 ogg_reset_cur_page(oggstream);
00162
00163 while (*p) {
00164 if (ogg_compare_granule(s, &(*p)->page, &l->page))
00165 break;
00166 p = &(*p)->next;
00167 }
00168 l->next = *p;
00169 *p = l;
00170
00171 return 0;
00172 }
00173
00174 static int ogg_buffer_data(AVFormatContext *s, AVStream *st,
00175 uint8_t *data, unsigned size, int64_t granule)
00176 {
00177 OGGStreamContext *oggstream = st->priv_data;
00178 int total_segments = size / 255 + 1;
00179 uint8_t *p = data;
00180 int i, segments, len, flush = 0;
00181
00182
00183 if (st->codec->codec_id == CODEC_ID_THEORA &&
00184 ogg_granule_to_timestamp(oggstream, granule) >
00185 ogg_granule_to_timestamp(oggstream, oggstream->last_granule) + 1) {
00186 if (oggstream->page.granule != -1)
00187 ogg_buffer_page(s, oggstream);
00188 flush = 1;
00189 }
00190
00191 for (i = 0; i < total_segments; ) {
00192 OGGPage *page = &oggstream->page;
00193
00194 segments = FFMIN(total_segments - i, 255 - page->segments_count);
00195
00196 if (i && !page->segments_count)
00197 page->flags |= 1;
00198
00199 memset(page->segments+page->segments_count, 255, segments - 1);
00200 page->segments_count += segments - 1;
00201
00202 len = FFMIN(size, segments*255);
00203 page->segments[page->segments_count++] = len - (segments-1)*255;
00204 memcpy(page->data+page->size, p, len);
00205 p += len;
00206 size -= len;
00207 i += segments;
00208 page->size += len;
00209
00210 if (i == total_segments)
00211 page->granule = granule;
00212
00213 if (page->segments_count == 255) {
00214 ogg_buffer_page(s, oggstream);
00215 }
00216 }
00217
00218 if (flush && oggstream->page.granule != -1)
00219 ogg_buffer_page(s, oggstream);
00220
00221 return 0;
00222 }
00223
00224 static uint8_t *ogg_write_vorbiscomment(int offset, int bitexact,
00225 int *header_len, AVDictionary **m, int framing_bit)
00226 {
00227 const char *vendor = bitexact ? "Libav" : LIBAVFORMAT_IDENT;
00228 int size;
00229 uint8_t *p, *p0;
00230 unsigned int count;
00231
00232 ff_metadata_conv(m, ff_vorbiscomment_metadata_conv, NULL);
00233
00234 size = offset + ff_vorbiscomment_length(*m, vendor, &count) + framing_bit;
00235 p = av_mallocz(size);
00236 if (!p)
00237 return NULL;
00238 p0 = p;
00239
00240 p += offset;
00241 ff_vorbiscomment_write(&p, m, vendor, count);
00242 if (framing_bit)
00243 bytestream_put_byte(&p, 1);
00244
00245 *header_len = size;
00246 return p0;
00247 }
00248
00249 static int ogg_build_flac_headers(AVCodecContext *avctx,
00250 OGGStreamContext *oggstream, int bitexact,
00251 AVDictionary **m)
00252 {
00253 enum FLACExtradataFormat format;
00254 uint8_t *streaminfo;
00255 uint8_t *p;
00256
00257 if (!avpriv_flac_is_extradata_valid(avctx, &format, &streaminfo))
00258 return -1;
00259
00260
00261 oggstream->header_len[0] = 51;
00262 oggstream->header[0] = av_mallocz(51);
00263 p = oggstream->header[0];
00264 if (!p)
00265 return AVERROR(ENOMEM);
00266 bytestream_put_byte(&p, 0x7F);
00267 bytestream_put_buffer(&p, "FLAC", 4);
00268 bytestream_put_byte(&p, 1);
00269 bytestream_put_byte(&p, 0);
00270 bytestream_put_be16(&p, 1);
00271 bytestream_put_buffer(&p, "fLaC", 4);
00272 bytestream_put_byte(&p, 0x00);
00273 bytestream_put_be24(&p, 34);
00274 bytestream_put_buffer(&p, streaminfo, FLAC_STREAMINFO_SIZE);
00275
00276
00277 p = ogg_write_vorbiscomment(4, bitexact, &oggstream->header_len[1], m, 0);
00278 if (!p)
00279 return AVERROR(ENOMEM);
00280 oggstream->header[1] = p;
00281 bytestream_put_byte(&p, 0x84);
00282 bytestream_put_be24(&p, oggstream->header_len[1] - 4);
00283
00284 return 0;
00285 }
00286
00287 #define SPEEX_HEADER_SIZE 80
00288
00289 static int ogg_build_speex_headers(AVCodecContext *avctx,
00290 OGGStreamContext *oggstream, int bitexact,
00291 AVDictionary **m)
00292 {
00293 uint8_t *p;
00294
00295 if (avctx->extradata_size < SPEEX_HEADER_SIZE)
00296 return -1;
00297
00298
00299 p = av_mallocz(SPEEX_HEADER_SIZE);
00300 if (!p)
00301 return AVERROR(ENOMEM);
00302 oggstream->header[0] = p;
00303 oggstream->header_len[0] = SPEEX_HEADER_SIZE;
00304 bytestream_put_buffer(&p, avctx->extradata, SPEEX_HEADER_SIZE);
00305 AV_WL32(&oggstream->header[0][68], 0);
00306
00307
00308 p = ogg_write_vorbiscomment(0, bitexact, &oggstream->header_len[1], m, 0);
00309 if (!p)
00310 return AVERROR(ENOMEM);
00311 oggstream->header[1] = p;
00312
00313 return 0;
00314 }
00315
00316 static int ogg_write_header(AVFormatContext *s)
00317 {
00318 OGGStreamContext *oggstream;
00319 int i, j;
00320
00321 for (i = 0; i < s->nb_streams; i++) {
00322 AVStream *st = s->streams[i];
00323 unsigned serial_num = i;
00324
00325 if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO)
00326 avpriv_set_pts_info(st, 64, 1, st->codec->sample_rate);
00327 else if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO)
00328 avpriv_set_pts_info(st, 64, st->codec->time_base.num, st->codec->time_base.den);
00329 if (st->codec->codec_id != CODEC_ID_VORBIS &&
00330 st->codec->codec_id != CODEC_ID_THEORA &&
00331 st->codec->codec_id != CODEC_ID_SPEEX &&
00332 st->codec->codec_id != CODEC_ID_FLAC) {
00333 av_log(s, AV_LOG_ERROR, "Unsupported codec id in stream %d\n", i);
00334 return -1;
00335 }
00336
00337 if (!st->codec->extradata || !st->codec->extradata_size) {
00338 av_log(s, AV_LOG_ERROR, "No extradata present\n");
00339 return -1;
00340 }
00341 oggstream = av_mallocz(sizeof(*oggstream));
00342 oggstream->page.stream_index = i;
00343
00344 if (!(st->codec->flags & CODEC_FLAG_BITEXACT))
00345 do {
00346 serial_num = av_get_random_seed();
00347 for (j = 0; j < i; j++) {
00348 OGGStreamContext *sc = s->streams[j]->priv_data;
00349 if (serial_num == sc->serial_num)
00350 break;
00351 }
00352 } while (j < i);
00353 oggstream->serial_num = serial_num;
00354
00355 st->priv_data = oggstream;
00356 if (st->codec->codec_id == CODEC_ID_FLAC) {
00357 int err = ogg_build_flac_headers(st->codec, oggstream,
00358 st->codec->flags & CODEC_FLAG_BITEXACT,
00359 &s->metadata);
00360 if (err) {
00361 av_log(s, AV_LOG_ERROR, "Error writing FLAC headers\n");
00362 av_freep(&st->priv_data);
00363 return err;
00364 }
00365 } else if (st->codec->codec_id == CODEC_ID_SPEEX) {
00366 int err = ogg_build_speex_headers(st->codec, oggstream,
00367 st->codec->flags & CODEC_FLAG_BITEXACT,
00368 &s->metadata);
00369 if (err) {
00370 av_log(s, AV_LOG_ERROR, "Error writing Speex headers\n");
00371 av_freep(&st->priv_data);
00372 return err;
00373 }
00374 } else {
00375 uint8_t *p;
00376 const char *cstr = st->codec->codec_id == CODEC_ID_VORBIS ? "vorbis" : "theora";
00377 int header_type = st->codec->codec_id == CODEC_ID_VORBIS ? 3 : 0x81;
00378 int framing_bit = st->codec->codec_id == CODEC_ID_VORBIS ? 1 : 0;
00379
00380 if (avpriv_split_xiph_headers(st->codec->extradata, st->codec->extradata_size,
00381 st->codec->codec_id == CODEC_ID_VORBIS ? 30 : 42,
00382 oggstream->header, oggstream->header_len) < 0) {
00383 av_log(s, AV_LOG_ERROR, "Extradata corrupted\n");
00384 av_freep(&st->priv_data);
00385 return -1;
00386 }
00387
00388 p = ogg_write_vorbiscomment(7, st->codec->flags & CODEC_FLAG_BITEXACT,
00389 &oggstream->header_len[1], &s->metadata,
00390 framing_bit);
00391 if (!p)
00392 return AVERROR(ENOMEM);
00393
00394 oggstream->header[1] = p;
00395 bytestream_put_byte(&p, header_type);
00396 bytestream_put_buffer(&p, cstr, 6);
00397
00398 if (st->codec->codec_id == CODEC_ID_THEORA) {
00401 oggstream->kfgshift = ((oggstream->header[0][40]&3)<<3)|(oggstream->header[0][41]>>5);
00402 oggstream->vrev = oggstream->header[0][9];
00403 av_log(s, AV_LOG_DEBUG, "theora kfgshift %d, vrev %d\n",
00404 oggstream->kfgshift, oggstream->vrev);
00405 }
00406 }
00407 }
00408
00409 for (j = 0; j < s->nb_streams; j++) {
00410 OGGStreamContext *oggstream = s->streams[j]->priv_data;
00411 ogg_buffer_data(s, s->streams[j], oggstream->header[0],
00412 oggstream->header_len[0], 0);
00413 oggstream->page.flags |= 2;
00414 ogg_buffer_page(s, oggstream);
00415 }
00416 for (j = 0; j < s->nb_streams; j++) {
00417 AVStream *st = s->streams[j];
00418 OGGStreamContext *oggstream = st->priv_data;
00419 for (i = 1; i < 3; i++) {
00420 if (oggstream && oggstream->header_len[i])
00421 ogg_buffer_data(s, st, oggstream->header[i],
00422 oggstream->header_len[i], 0);
00423 }
00424 ogg_buffer_page(s, oggstream);
00425 }
00426 return 0;
00427 }
00428
00429 static void ogg_write_pages(AVFormatContext *s, int flush)
00430 {
00431 OGGContext *ogg = s->priv_data;
00432 OGGPageList *next, *p;
00433
00434 if (!ogg->page_list)
00435 return;
00436
00437 for (p = ogg->page_list; p; ) {
00438 OGGStreamContext *oggstream =
00439 s->streams[p->page.stream_index]->priv_data;
00440 if (oggstream->page_count < 2 && !flush)
00441 break;
00442 ogg_write_page(s, &p->page,
00443 flush && oggstream->page_count == 1 ? 4 : 0);
00444 next = p->next;
00445 av_freep(&p);
00446 p = next;
00447 }
00448 ogg->page_list = p;
00449 }
00450
00451 static int ogg_write_packet(AVFormatContext *s, AVPacket *pkt)
00452 {
00453 AVStream *st = s->streams[pkt->stream_index];
00454 OGGStreamContext *oggstream = st->priv_data;
00455 int ret;
00456 int64_t granule;
00457
00458 if (st->codec->codec_id == CODEC_ID_THEORA) {
00459 int64_t pts = oggstream->vrev < 1 ? pkt->pts : pkt->pts + pkt->duration;
00460 int pframe_count;
00461 if (pkt->flags & AV_PKT_FLAG_KEY)
00462 oggstream->last_kf_pts = pts;
00463 pframe_count = pts - oggstream->last_kf_pts;
00464
00465 if (pframe_count >= (1<<oggstream->kfgshift)) {
00466 oggstream->last_kf_pts += pframe_count;
00467 pframe_count = 0;
00468 }
00469 granule = (oggstream->last_kf_pts<<oggstream->kfgshift) | pframe_count;
00470 } else
00471 granule = pkt->pts + pkt->duration;
00472
00473 ret = ogg_buffer_data(s, st, pkt->data, pkt->size, granule);
00474 if (ret < 0)
00475 return ret;
00476
00477 ogg_write_pages(s, 0);
00478
00479 oggstream->last_granule = granule;
00480
00481 return 0;
00482 }
00483
00484 static int ogg_write_trailer(AVFormatContext *s)
00485 {
00486 int i;
00487
00488
00489 for (i = 0; i < s->nb_streams; i++)
00490 ogg_buffer_page(s, s->streams[i]->priv_data);
00491
00492 ogg_write_pages(s, 1);
00493
00494 for (i = 0; i < s->nb_streams; i++) {
00495 AVStream *st = s->streams[i];
00496 OGGStreamContext *oggstream = st->priv_data;
00497 if (st->codec->codec_id == CODEC_ID_FLAC ||
00498 st->codec->codec_id == CODEC_ID_SPEEX) {
00499 av_free(oggstream->header[0]);
00500 av_free(oggstream->header[1]);
00501 }
00502 av_freep(&st->priv_data);
00503 }
00504 return 0;
00505 }
00506
00507 AVOutputFormat ff_ogg_muxer = {
00508 .name = "ogg",
00509 .long_name = NULL_IF_CONFIG_SMALL("Ogg"),
00510 .mime_type = "application/ogg",
00511 .extensions = "ogg,ogv,spx",
00512 .priv_data_size = sizeof(OGGContext),
00513 .audio_codec = CODEC_ID_FLAC,
00514 .video_codec = CODEC_ID_THEORA,
00515 .write_header = ogg_write_header,
00516 .write_packet = ogg_write_packet,
00517 .write_trailer = ogg_write_trailer,
00518 };