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"
30 unsigned page_counter;
33 /** for theora granule */
40 static void ogg_update_checksum(AVFormatContext *s, int64_t crc_offset)
42 int64_t pos = url_ftell(s->pb);
43 uint32_t checksum = get_checksum(s->pb);
44 url_fseek(s->pb, crc_offset, SEEK_SET);
45 put_be32(s->pb, checksum);
46 url_fseek(s->pb, pos, SEEK_SET);
49 static int ogg_write_page(AVFormatContext *s, const uint8_t *data, int size,
50 int64_t granule, int stream_index, int flags)
52 OGGStreamContext *oggstream = s->streams[stream_index]->priv_data;
56 if (size >= 255*255) {
59 } else if (oggstream->eos)
62 page_segments = FFMIN((size/255)+!!size, 255);
64 init_checksum(s->pb, ff_crc04C11DB7_update, 0);
65 put_tag(s->pb, "OggS");
67 put_byte(s->pb, flags);
68 put_le64(s->pb, granule);
69 put_le32(s->pb, stream_index);
70 put_le32(s->pb, oggstream->page_counter++);
71 crc_offset = url_ftell(s->pb);
72 put_le32(s->pb, 0); // crc
73 put_byte(s->pb, page_segments);
74 for (i = 0; i < page_segments-1; i++)
77 put_byte(s->pb, size - (page_segments-1)*255);
78 put_buffer(s->pb, data, size);
80 ogg_update_checksum(s, crc_offset);
81 put_flush_packet(s->pb);
85 static int ogg_build_flac_headers(const uint8_t *extradata, int extradata_size,
86 OGGStreamContext *oggstream, int bitexact)
88 const char *vendor = bitexact ? "ffmpeg" : LIBAVFORMAT_IDENT;
90 if (extradata_size != 34)
92 oggstream->header_len[0] = 51;
93 oggstream->header[0] = av_mallocz(51); // per ogg flac specs
94 p = oggstream->header[0];
95 bytestream_put_byte(&p, 0x7F);
96 bytestream_put_buffer(&p, "FLAC", 4);
97 bytestream_put_byte(&p, 1); // major version
98 bytestream_put_byte(&p, 0); // minor version
99 bytestream_put_be16(&p, 1); // headers packets without this one
100 bytestream_put_buffer(&p, "fLaC", 4);
101 bytestream_put_byte(&p, 0x00); // streaminfo
102 bytestream_put_be24(&p, 34);
103 bytestream_put_buffer(&p, extradata, 34);
104 oggstream->header_len[1] = 1+3+4+strlen(vendor)+4;
105 oggstream->header[1] = av_mallocz(oggstream->header_len[1]);
106 p = oggstream->header[1];
107 bytestream_put_byte(&p, 0x84); // last metadata block and vorbis comment
108 bytestream_put_be24(&p, oggstream->header_len[1] - 4);
109 bytestream_put_le32(&p, strlen(vendor));
110 bytestream_put_buffer(&p, vendor, strlen(vendor));
111 bytestream_put_le32(&p, 0); // user comment list length
115 static int ogg_write_header(AVFormatContext *s)
117 OGGStreamContext *oggstream;
119 for (i = 0; i < s->nb_streams; i++) {
120 AVStream *st = s->streams[i];
121 if (st->codec->codec_type == CODEC_TYPE_AUDIO)
122 av_set_pts_info(st, 64, 1, st->codec->sample_rate);
123 else if (st->codec->codec_type == CODEC_TYPE_VIDEO)
124 av_set_pts_info(st, 64, st->codec->time_base.num, st->codec->time_base.den);
125 if (st->codec->codec_id != CODEC_ID_VORBIS &&
126 st->codec->codec_id != CODEC_ID_THEORA &&
127 st->codec->codec_id != CODEC_ID_FLAC) {
128 av_log(s, AV_LOG_ERROR, "Unsupported codec id in stream %d\n", i);
132 if (!st->codec->extradata || !st->codec->extradata_size) {
133 av_log(s, AV_LOG_ERROR, "No extradata present\n");
136 oggstream = av_mallocz(sizeof(*oggstream));
137 st->priv_data = oggstream;
138 if (st->codec->codec_id == CODEC_ID_FLAC) {
139 if (ogg_build_flac_headers(st->codec->extradata, st->codec->extradata_size,
140 oggstream, st->codec->flags & CODEC_FLAG_BITEXACT) < 0) {
141 av_log(s, AV_LOG_ERROR, "Extradata corrupted\n");
142 av_freep(&st->priv_data);
145 if (ff_split_xiph_headers(st->codec->extradata, st->codec->extradata_size,
146 st->codec->codec_id == CODEC_ID_VORBIS ? 30 : 42,
147 oggstream->header, oggstream->header_len) < 0) {
148 av_log(s, AV_LOG_ERROR, "Extradata corrupted\n");
149 av_freep(&st->priv_data);
152 if (st->codec->codec_id == CODEC_ID_THEORA) {
153 /** KFGSHIFT is the width of the less significant section of the granule position
154 The less significant section is the frame count since the last keyframe */
155 oggstream->kfgshift = ((oggstream->header[0][40]&3)<<3)|(oggstream->header[0][41]>>5);
156 oggstream->vrev = oggstream->header[0][9];
157 av_log(s, AV_LOG_DEBUG, "theora kfgshift %d, vrev %d\n",
158 oggstream->kfgshift, oggstream->vrev);
162 for (i = 0; i < 3; i++) {
163 for (j = 0; j < s->nb_streams; j++) {
164 AVStream *st = s->streams[j];
165 OGGStreamContext *oggstream = st->priv_data;
166 if (oggstream && oggstream->header_len[i]) {
167 ogg_write_page(s, oggstream->header[i], oggstream->header_len[i],
168 0, st->index, i ? 0 : 2); // bos
175 static int ogg_write_packet(AVFormatContext *s, AVPacket *pkt)
177 AVStream *st = s->streams[pkt->stream_index];
178 OGGStreamContext *oggstream = st->priv_data;
179 uint8_t *ptr = pkt->data;
180 int ret, size = pkt->size;
183 if (st->codec->codec_id == CODEC_ID_THEORA) {
184 int64_t pts = oggstream->vrev < 1 ? pkt->pts : pkt->pts + pkt->duration;
186 if (pkt->flags & PKT_FLAG_KEY)
187 oggstream->last_kf_pts = pts;
188 pframe_count = pts - oggstream->last_kf_pts;
189 // prevent frame count from overflow if key frame flag is not set
190 if (pframe_count >= (1<<oggstream->kfgshift)) {
191 oggstream->last_kf_pts += pframe_count;
194 granule = (oggstream->last_kf_pts<<oggstream->kfgshift) | pframe_count;
196 granule = pkt->pts + pkt->duration;
197 oggstream->duration = granule;
199 ret = ogg_write_page(s, ptr, size, granule, pkt->stream_index, ptr != pkt->data);
200 ptr += ret; size -= ret;
201 } while (size > 0 || ret == 255*255); // need to output a last nil page
206 static int ogg_compare_granule(AVFormatContext *s, AVPacket *next, AVPacket *pkt)
208 AVStream *st2 = s->streams[next->stream_index];
209 AVStream *st = s->streams[pkt ->stream_index];
211 int64_t next_granule = av_rescale_q(next->pts + next->duration,
212 st2->time_base, AV_TIME_BASE_Q);
213 int64_t cur_granule = av_rescale_q(pkt ->pts + pkt ->duration,
214 st ->time_base, AV_TIME_BASE_Q);
215 return next_granule > cur_granule;
218 static int ogg_interleave_per_granule(AVFormatContext *s, AVPacket *out, AVPacket *pkt, int flush)
221 int stream_count = 0;
222 int streams[MAX_STREAMS] = {0};
226 ff_interleave_add_packet(s, pkt, ogg_compare_granule);
229 pktl = s->packet_buffer;
231 if (streams[pktl->pkt.stream_index] == 0)
233 streams[pktl->pkt.stream_index]++;
234 // need to buffer at least one packet to set eos flag
235 if (streams[pktl->pkt.stream_index] == 2)
240 if ((s->nb_streams == stream_count && interleaved == stream_count) ||
241 (flush && stream_count)) {
242 pktl= s->packet_buffer;
244 s->packet_buffer = pktl->next;
245 if (flush && streams[out->stream_index] == 1) {
246 OGGStreamContext *ogg = s->streams[out->stream_index]->priv_data;
257 static int ogg_write_trailer(AVFormatContext *s)
260 for (i = 0; i < s->nb_streams; i++) {
261 AVStream *st = s->streams[i];
262 OGGStreamContext *oggstream = st->priv_data;
263 if (st->codec->codec_id == CODEC_ID_FLAC) {
264 av_free(oggstream->header[0]);
265 av_free(oggstream->header[1]);
267 av_freep(&st->priv_data);
272 AVOutputFormat ogg_muxer = {
274 NULL_IF_CONFIG_SMALL("Ogg"),
283 .interleave_packet = ogg_interleave_per_granule,