3 * Copyright (c) 2007 Baptiste Coudurier <baptiste dot coudurier at free dot fr>
5 * This file is part of FFmpeg.
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
22 #include "libavutil/crc.h"
23 #include "libavcodec/xiph.h"
24 #include "libavcodec/bytestream.h"
25 #include "libavcodec/flac.h"
31 unsigned page_counter;
34 /** for theora granule */
41 static void ogg_update_checksum(AVFormatContext *s, int64_t crc_offset)
43 int64_t pos = url_ftell(s->pb);
44 uint32_t checksum = get_checksum(s->pb);
45 url_fseek(s->pb, crc_offset, SEEK_SET);
46 put_be32(s->pb, checksum);
47 url_fseek(s->pb, pos, SEEK_SET);
50 static int ogg_write_page(AVFormatContext *s, const uint8_t *data, int size,
51 int64_t granule, int stream_index, int flags)
53 OGGStreamContext *oggstream = s->streams[stream_index]->priv_data;
57 if (size >= 255*255) {
60 } else if (oggstream->eos)
63 page_segments = FFMIN((size/255)+!!size, 255);
65 init_checksum(s->pb, ff_crc04C11DB7_update, 0);
66 put_tag(s->pb, "OggS");
68 put_byte(s->pb, flags);
69 put_le64(s->pb, granule);
70 put_le32(s->pb, stream_index);
71 put_le32(s->pb, oggstream->page_counter++);
72 crc_offset = url_ftell(s->pb);
73 put_le32(s->pb, 0); // crc
74 put_byte(s->pb, page_segments);
75 for (i = 0; i < page_segments-1; i++)
78 put_byte(s->pb, size - (page_segments-1)*255);
79 put_buffer(s->pb, data, size);
81 ogg_update_checksum(s, crc_offset);
82 put_flush_packet(s->pb);
86 static uint8_t *ogg_write_vorbiscomment(int offset, int bitexact,
89 const char *vendor = bitexact ? "ffmpeg" : LIBAVFORMAT_IDENT;
93 size = offset + 4 + strlen(vendor) + 4;
100 bytestream_put_le32(&p, strlen(vendor));
101 bytestream_put_buffer(&p, vendor, strlen(vendor));
102 bytestream_put_le32(&p, 0); // user comment list length
108 static int ogg_build_flac_headers(AVCodecContext *avctx,
109 OGGStreamContext *oggstream, int bitexact)
111 enum FLACExtradataFormat format;
115 if (!ff_flac_is_extradata_valid(avctx, &format, &streaminfo))
118 // first packet: STREAMINFO
119 oggstream->header_len[0] = 51;
120 oggstream->header[0] = av_mallocz(51); // per ogg flac specs
121 p = oggstream->header[0];
123 return AVERROR_NOMEM;
124 bytestream_put_byte(&p, 0x7F);
125 bytestream_put_buffer(&p, "FLAC", 4);
126 bytestream_put_byte(&p, 1); // major version
127 bytestream_put_byte(&p, 0); // minor version
128 bytestream_put_be16(&p, 1); // headers packets without this one
129 bytestream_put_buffer(&p, "fLaC", 4);
130 bytestream_put_byte(&p, 0x00); // streaminfo
131 bytestream_put_be24(&p, 34);
132 bytestream_put_buffer(&p, streaminfo, FLAC_STREAMINFO_SIZE);
134 // second packet: VorbisComment
135 p = ogg_write_vorbiscomment(4, bitexact, &oggstream->header_len[1]);
137 return AVERROR_NOMEM;
138 oggstream->header[1] = p;
139 bytestream_put_byte(&p, 0x84); // last metadata block and vorbis comment
140 bytestream_put_be24(&p, oggstream->header_len[1] - 4);
145 #define SPEEX_HEADER_SIZE 80
147 static int ogg_build_speex_headers(AVCodecContext *avctx,
148 OGGStreamContext *oggstream, int bitexact)
152 if (avctx->extradata_size < SPEEX_HEADER_SIZE)
155 // first packet: Speex header
156 p = av_mallocz(SPEEX_HEADER_SIZE);
158 return AVERROR_NOMEM;
159 oggstream->header[0] = p;
160 oggstream->header_len[0] = SPEEX_HEADER_SIZE;
161 bytestream_put_buffer(&p, avctx->extradata, SPEEX_HEADER_SIZE);
162 AV_WL32(&oggstream->header[0][68], 0); // set extra_headers to 0
164 // second packet: VorbisComment
165 p = ogg_write_vorbiscomment(0, bitexact, &oggstream->header_len[1]);
167 return AVERROR_NOMEM;
168 oggstream->header[1] = p;
173 static int ogg_write_header(AVFormatContext *s)
175 OGGStreamContext *oggstream;
177 for (i = 0; i < s->nb_streams; i++) {
178 AVStream *st = s->streams[i];
179 if (st->codec->codec_type == CODEC_TYPE_AUDIO)
180 av_set_pts_info(st, 64, 1, st->codec->sample_rate);
181 else if (st->codec->codec_type == CODEC_TYPE_VIDEO)
182 av_set_pts_info(st, 64, st->codec->time_base.num, st->codec->time_base.den);
183 if (st->codec->codec_id != CODEC_ID_VORBIS &&
184 st->codec->codec_id != CODEC_ID_THEORA &&
185 st->codec->codec_id != CODEC_ID_SPEEX &&
186 st->codec->codec_id != CODEC_ID_FLAC) {
187 av_log(s, AV_LOG_ERROR, "Unsupported codec id in stream %d\n", i);
191 if (!st->codec->extradata || !st->codec->extradata_size) {
192 av_log(s, AV_LOG_ERROR, "No extradata present\n");
195 oggstream = av_mallocz(sizeof(*oggstream));
196 st->priv_data = oggstream;
197 if (st->codec->codec_id == CODEC_ID_FLAC) {
198 int err = ogg_build_flac_headers(st->codec, oggstream,
199 st->codec->flags & CODEC_FLAG_BITEXACT);
201 av_log(s, AV_LOG_ERROR, "Error writing FLAC headers\n");
202 av_freep(&st->priv_data);
205 } else if (st->codec->codec_id == CODEC_ID_SPEEX) {
206 int err = ogg_build_speex_headers(st->codec, oggstream,
207 st->codec->flags & CODEC_FLAG_BITEXACT);
209 av_log(s, AV_LOG_ERROR, "Error writing Speex headers\n");
210 av_freep(&st->priv_data);
214 if (ff_split_xiph_headers(st->codec->extradata, st->codec->extradata_size,
215 st->codec->codec_id == CODEC_ID_VORBIS ? 30 : 42,
216 oggstream->header, oggstream->header_len) < 0) {
217 av_log(s, AV_LOG_ERROR, "Extradata corrupted\n");
218 av_freep(&st->priv_data);
221 if (st->codec->codec_id == CODEC_ID_THEORA) {
222 /** KFGSHIFT is the width of the less significant section of the granule position
223 The less significant section is the frame count since the last keyframe */
224 oggstream->kfgshift = ((oggstream->header[0][40]&3)<<3)|(oggstream->header[0][41]>>5);
225 oggstream->vrev = oggstream->header[0][9];
226 av_log(s, AV_LOG_DEBUG, "theora kfgshift %d, vrev %d\n",
227 oggstream->kfgshift, oggstream->vrev);
231 for (i = 0; i < 3; i++) {
232 for (j = 0; j < s->nb_streams; j++) {
233 AVStream *st = s->streams[j];
234 OGGStreamContext *oggstream = st->priv_data;
235 if (oggstream && oggstream->header_len[i]) {
236 ogg_write_page(s, oggstream->header[i], oggstream->header_len[i],
237 0, st->index, i ? 0 : 2); // bos
244 static int ogg_write_packet(AVFormatContext *s, AVPacket *pkt)
246 AVStream *st = s->streams[pkt->stream_index];
247 OGGStreamContext *oggstream = st->priv_data;
248 uint8_t *ptr = pkt->data;
249 int ret, size = pkt->size;
252 if (st->codec->codec_id == CODEC_ID_THEORA) {
253 int64_t pts = oggstream->vrev < 1 ? pkt->pts : pkt->pts + pkt->duration;
255 if (pkt->flags & PKT_FLAG_KEY)
256 oggstream->last_kf_pts = pts;
257 pframe_count = pts - oggstream->last_kf_pts;
258 // prevent frame count from overflow if key frame flag is not set
259 if (pframe_count >= (1<<oggstream->kfgshift)) {
260 oggstream->last_kf_pts += pframe_count;
263 granule = (oggstream->last_kf_pts<<oggstream->kfgshift) | pframe_count;
265 granule = pkt->pts + pkt->duration;
266 oggstream->duration = granule;
268 ret = ogg_write_page(s, ptr, size, granule, pkt->stream_index, ptr != pkt->data);
269 ptr += ret; size -= ret;
270 } while (size > 0 || ret == 255*255); // need to output a last nil page
275 static int ogg_compare_granule(AVFormatContext *s, AVPacket *next, AVPacket *pkt)
277 AVStream *st2 = s->streams[next->stream_index];
278 AVStream *st = s->streams[pkt ->stream_index];
280 int64_t next_granule = av_rescale_q(next->pts + next->duration,
281 st2->time_base, AV_TIME_BASE_Q);
282 int64_t cur_granule = av_rescale_q(pkt ->pts + pkt ->duration,
283 st ->time_base, AV_TIME_BASE_Q);
284 return next_granule > cur_granule;
287 static int ogg_interleave_per_granule(AVFormatContext *s, AVPacket *out, AVPacket *pkt, int flush)
290 int stream_count = 0;
291 int streams[MAX_STREAMS] = {0};
295 ff_interleave_add_packet(s, pkt, ogg_compare_granule);
298 pktl = s->packet_buffer;
300 if (streams[pktl->pkt.stream_index] == 0)
302 streams[pktl->pkt.stream_index]++;
303 // need to buffer at least one packet to set eos flag
304 if (streams[pktl->pkt.stream_index] == 2)
309 if ((s->nb_streams == stream_count && interleaved == stream_count) ||
310 (flush && stream_count)) {
311 pktl= s->packet_buffer;
313 s->packet_buffer = pktl->next;
314 if (flush && streams[out->stream_index] == 1) {
315 OGGStreamContext *ogg = s->streams[out->stream_index]->priv_data;
318 if(!s->packet_buffer)
319 s->packet_buffer_end= NULL;
321 if(s->streams[out->stream_index]->last_in_packet_buffer == pktl)
322 s->streams[out->stream_index]->last_in_packet_buffer= NULL;
332 static int ogg_write_trailer(AVFormatContext *s)
335 for (i = 0; i < s->nb_streams; i++) {
336 AVStream *st = s->streams[i];
337 OGGStreamContext *oggstream = st->priv_data;
338 if (st->codec->codec_id == CODEC_ID_FLAC ||
339 st->codec->codec_id == CODEC_ID_SPEEX) {
340 av_free(oggstream->header[0]);
341 av_free(oggstream->header[1]);
343 av_freep(&st->priv_data);
348 AVOutputFormat ogg_muxer = {
350 NULL_IF_CONFIG_SMALL("Ogg"),
359 .interleave_packet = ogg_interleave_per_granule,