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
25 #include "bytestream.h"
29 unsigned page_counter;
32 /** for theora granule */
38 static void ogg_update_checksum(AVFormatContext *s, offset_t crc_offset)
40 offset_t pos = url_ftell(s->pb);
41 uint32_t checksum = get_checksum(s->pb);
42 url_fseek(s->pb, crc_offset, SEEK_SET);
43 put_be32(s->pb, checksum);
44 url_fseek(s->pb, pos, SEEK_SET);
47 static int ogg_write_page(AVFormatContext *s, const uint8_t *data, int size,
48 int64_t granule, int stream_index, int flags)
50 OGGStreamContext *oggstream = s->streams[stream_index]->priv_data;
54 if (size >= 255*255) {
59 page_segments = FFMIN((size/255)+!!size, 255);
61 init_checksum(s->pb, ff_crc04C11DB7_update, 0);
62 put_tag(s->pb, "OggS");
64 put_byte(s->pb, flags);
65 put_le64(s->pb, granule);
66 put_le32(s->pb, stream_index);
67 put_le32(s->pb, oggstream->page_counter++);
68 crc_offset = url_ftell(s->pb);
69 put_le32(s->pb, 0); // crc
70 put_byte(s->pb, page_segments);
71 for (i = 0; i < page_segments-1; i++)
74 put_byte(s->pb, size - (page_segments-1)*255);
75 put_buffer(s->pb, data, size);
77 ogg_update_checksum(s, crc_offset);
78 put_flush_packet(s->pb);
82 static int ogg_build_flac_headers(const uint8_t *extradata, int extradata_size,
83 OGGStreamContext *oggstream, int bitexact)
85 const char *vendor = bitexact ? "ffmpeg" : LIBAVFORMAT_IDENT;
87 if (extradata_size != 34)
89 oggstream->header_len[0] = 79;
90 oggstream->header[0] = av_mallocz(79); // per ogg flac specs
91 p = oggstream->header[0];
92 bytestream_put_byte(&p, 0x7F);
93 bytestream_put_buffer(&p, "FLAC", 4);
94 bytestream_put_byte(&p, 1); // major version
95 bytestream_put_byte(&p, 0); // minor version
96 bytestream_put_be16(&p, 1); // headers packets without this one
97 bytestream_put_buffer(&p, "fLaC", 4);
98 bytestream_put_byte(&p, 0x00); // streaminfo
99 bytestream_put_be24(&p, 34);
100 bytestream_put_buffer(&p, extradata, 34);
101 oggstream->header_len[1] = 1+3+4+strlen(vendor)+4;
102 oggstream->header[1] = av_mallocz(oggstream->header_len[1]);
103 p = oggstream->header[1];
104 bytestream_put_byte(&p, 0x84); // last metadata block and vorbis comment
105 bytestream_put_be24(&p, oggstream->header_len[1] - 4);
106 bytestream_put_le32(&p, strlen(vendor));
107 bytestream_put_buffer(&p, vendor, strlen(vendor));
108 bytestream_put_le32(&p, 0); // user comment list length
112 static int ogg_write_header(AVFormatContext *s)
114 OGGStreamContext *oggstream;
116 for (i = 0; i < s->nb_streams; i++) {
117 AVStream *st = s->streams[i];
118 if (st->codec->codec_type == CODEC_TYPE_AUDIO)
119 av_set_pts_info(st, 64, 1, st->codec->sample_rate);
120 else if (st->codec->codec_type == CODEC_TYPE_VIDEO)
121 av_set_pts_info(st, 64, st->codec->time_base.num, st->codec->time_base.den);
122 if (st->codec->codec_id != CODEC_ID_VORBIS &&
123 st->codec->codec_id != CODEC_ID_THEORA &&
124 st->codec->codec_id != CODEC_ID_FLAC) {
125 av_log(s, AV_LOG_ERROR, "Unsupported codec id in stream %d\n", i);
129 if (!st->codec->extradata || !st->codec->extradata_size) {
130 av_log(s, AV_LOG_ERROR, "No extradata present\n");
133 oggstream = av_mallocz(sizeof(*oggstream));
134 st->priv_data = oggstream;
135 if (st->codec->codec_id == CODEC_ID_FLAC) {
136 if (ogg_build_flac_headers(st->codec->extradata, st->codec->extradata_size,
137 oggstream, st->codec->flags & CODEC_FLAG_BITEXACT) < 0) {
138 av_log(s, AV_LOG_ERROR, "Extradata corrupted\n");
139 av_freep(&st->priv_data);
142 if (ff_split_xiph_headers(st->codec->extradata, st->codec->extradata_size,
143 st->codec->codec_id == CODEC_ID_VORBIS ? 30 : 42,
144 oggstream->header, oggstream->header_len) < 0) {
145 av_log(s, AV_LOG_ERROR, "Extradata corrupted\n");
146 av_freep(&st->priv_data);
149 if (st->codec->codec_id == CODEC_ID_THEORA) {
150 /** KFGSHIFT is the width of the less significant section of the granule position
151 The less significant section is the frame count since the last keyframe */
152 oggstream->kfgshift = ((oggstream->header[0][40]&3)<<3)|(oggstream->header[0][41]>>5);
153 oggstream->vrev = oggstream->header[0][9];
154 av_log(s, AV_LOG_DEBUG, "theora kfgshift %d, vrev %d\n",
155 oggstream->kfgshift, oggstream->vrev);
159 for (i = 0; i < 3; i++) {
160 for (j = 0; j < s->nb_streams; j++) {
161 AVStream *st = s->streams[j];
162 OGGStreamContext *oggstream = st->priv_data;
163 if (oggstream && oggstream->header_len[i]) {
164 ogg_write_page(s, oggstream->header[i], oggstream->header_len[i],
165 0, st->index, i ? 0 : 2); // bos
172 static int ogg_write_packet(AVFormatContext *s, AVPacket *pkt)
174 AVStream *st = s->streams[pkt->stream_index];
175 OGGStreamContext *oggstream = st->priv_data;
176 uint8_t *ptr = pkt->data;
177 int ret, size = pkt->size;
180 if (st->codec->codec_id == CODEC_ID_THEORA) {
181 int64_t pts = oggstream->vrev < 1 ? pkt->pts : pkt->pts + pkt->duration;
183 if (pkt->flags & PKT_FLAG_KEY)
184 oggstream->last_kf_pts = pts;
185 pframe_count = pts - oggstream->last_kf_pts;
186 // prevent frame count from overflow if key frame flag is not set
187 if (pframe_count >= (1<<oggstream->kfgshift)) {
188 oggstream->last_kf_pts += pframe_count;
191 granule = (oggstream->last_kf_pts<<oggstream->kfgshift) | pframe_count;
193 granule = pkt->pts + pkt->duration;
194 oggstream->duration = granule;
196 ret = ogg_write_page(s, ptr, size, granule, pkt->stream_index, ptr != pkt->data);
197 ptr += ret; size -= ret;
198 } while (size > 0 || ret == 255*255); // need to output a last nil page
204 static int ogg_write_trailer(AVFormatContext *s)
207 for (i = 0; i < s->nb_streams; i++) {
208 AVStream *st = s->streams[i];
209 OGGStreamContext *oggstream = st->priv_data;
210 ogg_write_page(s, NULL, 0, oggstream->duration, i, 4); // eos
211 if (st->codec->codec_id == CODEC_ID_FLAC) {
212 av_free(oggstream->header[0]);
213 av_free(oggstream->header[1]);
215 av_freep(&st->priv_data);
220 AVOutputFormat ogg_muxer = {