Remove MAX_STREAMS usage in ogg and mxf muxers
[ffmpeg.git] / libavformat / oggenc.c
1 /*
2  * Ogg muxer
3  * Copyright (c) 2007 Baptiste Coudurier <baptiste dot coudurier at free dot fr>
4  *
5  * This file is part of FFmpeg.
6  *
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.
11  *
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.
16  *
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
20  */
21
22 #include "libavutil/crc.h"
23 #include "libavcodec/xiph.h"
24 #include "libavcodec/bytestream.h"
25 #include "libavcodec/flac.h"
26 #include "avformat.h"
27 #include "internal.h"
28
29 typedef struct {
30     int64_t duration;
31     unsigned page_counter;
32     uint8_t *header[3];
33     int header_len[3];
34     /** for theora granule */
35     int kfgshift;
36     int64_t last_kf_pts;
37     int vrev;
38     int eos;
39     unsigned packet_count; ///< number of packet buffered
40 } OGGStreamContext;
41
42 static void ogg_update_checksum(AVFormatContext *s, int64_t crc_offset)
43 {
44     int64_t pos = url_ftell(s->pb);
45     uint32_t checksum = get_checksum(s->pb);
46     url_fseek(s->pb, crc_offset, SEEK_SET);
47     put_be32(s->pb, checksum);
48     url_fseek(s->pb, pos, SEEK_SET);
49 }
50
51 static int ogg_write_page(AVFormatContext *s, const uint8_t *data, int size,
52                           int64_t granule, int stream_index, int flags)
53 {
54     OGGStreamContext *oggstream = s->streams[stream_index]->priv_data;
55     int64_t crc_offset;
56     int page_segments, i;
57
58     if (size >= 255*255) {
59         granule = -1;
60         size = 255*255;
61     } else if (oggstream->eos)
62         flags |= 4;
63
64     page_segments = FFMIN((size/255)+!!size, 255);
65
66     init_checksum(s->pb, ff_crc04C11DB7_update, 0);
67     put_tag(s->pb, "OggS");
68     put_byte(s->pb, 0);
69     put_byte(s->pb, flags);
70     put_le64(s->pb, granule);
71     put_le32(s->pb, stream_index);
72     put_le32(s->pb, oggstream->page_counter++);
73     crc_offset = url_ftell(s->pb);
74     put_le32(s->pb, 0); // crc
75     put_byte(s->pb, page_segments);
76     for (i = 0; i < page_segments-1; i++)
77         put_byte(s->pb, 255);
78     if (size) {
79         put_byte(s->pb, size - (page_segments-1)*255);
80         put_buffer(s->pb, data, size);
81     }
82     ogg_update_checksum(s, crc_offset);
83     put_flush_packet(s->pb);
84     return size;
85 }
86
87 static uint8_t *ogg_write_vorbiscomment(int offset, int bitexact,
88                                         int *header_len)
89 {
90     const char *vendor = bitexact ? "ffmpeg" : LIBAVFORMAT_IDENT;
91     int size;
92     uint8_t *p, *p0;
93
94     size = offset + 4 + strlen(vendor) + 4;
95     p = av_mallocz(size);
96     if (!p)
97         return NULL;
98     p0 = p;
99
100     p += offset;
101     bytestream_put_le32(&p, strlen(vendor));
102     bytestream_put_buffer(&p, vendor, strlen(vendor));
103     bytestream_put_le32(&p, 0); // user comment list length
104
105     *header_len = size;
106     return p0;
107 }
108
109 static int ogg_build_flac_headers(AVCodecContext *avctx,
110                                   OGGStreamContext *oggstream, int bitexact)
111 {
112     enum FLACExtradataFormat format;
113     uint8_t *streaminfo;
114     uint8_t *p;
115
116     if (!ff_flac_is_extradata_valid(avctx, &format, &streaminfo))
117         return -1;
118
119     // first packet: STREAMINFO
120     oggstream->header_len[0] = 51;
121     oggstream->header[0] = av_mallocz(51); // per ogg flac specs
122     p = oggstream->header[0];
123     if (!p)
124         return AVERROR_NOMEM;
125     bytestream_put_byte(&p, 0x7F);
126     bytestream_put_buffer(&p, "FLAC", 4);
127     bytestream_put_byte(&p, 1); // major version
128     bytestream_put_byte(&p, 0); // minor version
129     bytestream_put_be16(&p, 1); // headers packets without this one
130     bytestream_put_buffer(&p, "fLaC", 4);
131     bytestream_put_byte(&p, 0x00); // streaminfo
132     bytestream_put_be24(&p, 34);
133     bytestream_put_buffer(&p, streaminfo, FLAC_STREAMINFO_SIZE);
134
135     // second packet: VorbisComment
136     p = ogg_write_vorbiscomment(4, bitexact, &oggstream->header_len[1]);
137     if (!p)
138         return AVERROR_NOMEM;
139     oggstream->header[1] = p;
140     bytestream_put_byte(&p, 0x84); // last metadata block and vorbis comment
141     bytestream_put_be24(&p, oggstream->header_len[1] - 4);
142
143     return 0;
144 }
145
146 #define SPEEX_HEADER_SIZE 80
147
148 static int ogg_build_speex_headers(AVCodecContext *avctx,
149                                    OGGStreamContext *oggstream, int bitexact)
150 {
151     uint8_t *p;
152
153     if (avctx->extradata_size < SPEEX_HEADER_SIZE)
154         return -1;
155
156     // first packet: Speex header
157     p = av_mallocz(SPEEX_HEADER_SIZE);
158     if (!p)
159         return AVERROR_NOMEM;
160     oggstream->header[0] = p;
161     oggstream->header_len[0] = SPEEX_HEADER_SIZE;
162     bytestream_put_buffer(&p, avctx->extradata, SPEEX_HEADER_SIZE);
163     AV_WL32(&oggstream->header[0][68], 0);  // set extra_headers to 0
164
165     // second packet: VorbisComment
166     p = ogg_write_vorbiscomment(0, bitexact, &oggstream->header_len[1]);
167     if (!p)
168         return AVERROR_NOMEM;
169     oggstream->header[1] = p;
170
171     return 0;
172 }
173
174 static int ogg_write_header(AVFormatContext *s)
175 {
176     OGGStreamContext *oggstream;
177     int i, j;
178     for (i = 0; i < s->nb_streams; i++) {
179         AVStream *st = s->streams[i];
180         if (st->codec->codec_type == CODEC_TYPE_AUDIO)
181             av_set_pts_info(st, 64, 1, st->codec->sample_rate);
182         else if (st->codec->codec_type == CODEC_TYPE_VIDEO)
183             av_set_pts_info(st, 64, st->codec->time_base.num, st->codec->time_base.den);
184         if (st->codec->codec_id != CODEC_ID_VORBIS &&
185             st->codec->codec_id != CODEC_ID_THEORA &&
186             st->codec->codec_id != CODEC_ID_SPEEX  &&
187             st->codec->codec_id != CODEC_ID_FLAC) {
188             av_log(s, AV_LOG_ERROR, "Unsupported codec id in stream %d\n", i);
189             return -1;
190         }
191
192         if (!st->codec->extradata || !st->codec->extradata_size) {
193             av_log(s, AV_LOG_ERROR, "No extradata present\n");
194             return -1;
195         }
196         oggstream = av_mallocz(sizeof(*oggstream));
197         st->priv_data = oggstream;
198         if (st->codec->codec_id == CODEC_ID_FLAC) {
199             int err = ogg_build_flac_headers(st->codec, oggstream,
200                                              st->codec->flags & CODEC_FLAG_BITEXACT);
201             if (err) {
202                 av_log(s, AV_LOG_ERROR, "Error writing FLAC headers\n");
203                 av_freep(&st->priv_data);
204                 return err;
205             }
206         } else if (st->codec->codec_id == CODEC_ID_SPEEX) {
207             int err = ogg_build_speex_headers(st->codec, oggstream,
208                                               st->codec->flags & CODEC_FLAG_BITEXACT);
209             if (err) {
210                 av_log(s, AV_LOG_ERROR, "Error writing Speex headers\n");
211                 av_freep(&st->priv_data);
212                 return err;
213             }
214         } else {
215             if (ff_split_xiph_headers(st->codec->extradata, st->codec->extradata_size,
216                                       st->codec->codec_id == CODEC_ID_VORBIS ? 30 : 42,
217                                       oggstream->header, oggstream->header_len) < 0) {
218                 av_log(s, AV_LOG_ERROR, "Extradata corrupted\n");
219                 av_freep(&st->priv_data);
220                 return -1;
221             }
222             if (st->codec->codec_id == CODEC_ID_THEORA) {
223                 /** KFGSHIFT is the width of the less significant section of the granule position
224                     The less significant section is the frame count since the last keyframe */
225                 oggstream->kfgshift = ((oggstream->header[0][40]&3)<<3)|(oggstream->header[0][41]>>5);
226                 oggstream->vrev = oggstream->header[0][9];
227                 av_log(s, AV_LOG_DEBUG, "theora kfgshift %d, vrev %d\n",
228                        oggstream->kfgshift, oggstream->vrev);
229             }
230         }
231     }
232     for (i = 0; i < 3; i++) {
233         for (j = 0; j < s->nb_streams; j++) {
234             AVStream *st = s->streams[j];
235             OGGStreamContext *oggstream = st->priv_data;
236             if (oggstream && oggstream->header_len[i]) {
237                 ogg_write_page(s, oggstream->header[i], oggstream->header_len[i],
238                                0, st->index, i ? 0 : 2); // bos
239             }
240         }
241     }
242     return 0;
243 }
244
245 static int ogg_write_packet(AVFormatContext *s, AVPacket *pkt)
246 {
247     AVStream *st = s->streams[pkt->stream_index];
248     OGGStreamContext *oggstream = st->priv_data;
249     uint8_t *ptr = pkt->data;
250     int ret, size = pkt->size;
251     int64_t granule;
252
253     if (st->codec->codec_id == CODEC_ID_THEORA) {
254         int64_t pts = oggstream->vrev < 1 ? pkt->pts : pkt->pts + pkt->duration;
255         int pframe_count;
256         if (pkt->flags & PKT_FLAG_KEY)
257             oggstream->last_kf_pts = pts;
258         pframe_count = pts - oggstream->last_kf_pts;
259         // prevent frame count from overflow if key frame flag is not set
260         if (pframe_count >= (1<<oggstream->kfgshift)) {
261             oggstream->last_kf_pts += pframe_count;
262             pframe_count = 0;
263         }
264         granule = (oggstream->last_kf_pts<<oggstream->kfgshift) | pframe_count;
265     } else
266         granule = pkt->pts + pkt->duration;
267     oggstream->duration = granule;
268     do {
269         ret = ogg_write_page(s, ptr, size, granule, pkt->stream_index, ptr != pkt->data);
270         ptr  += ret; size -= ret;
271     } while (size > 0 || ret == 255*255); // need to output a last nil page
272
273     return 0;
274 }
275
276 static int ogg_compare_granule(AVFormatContext *s, AVPacket *next, AVPacket *pkt)
277 {
278     AVStream *st2 = s->streams[next->stream_index];
279     AVStream *st  = s->streams[pkt ->stream_index];
280
281     int64_t next_granule = av_rescale_q(next->pts + next->duration,
282                                         st2->time_base, AV_TIME_BASE_Q);
283     int64_t cur_granule  = av_rescale_q(pkt ->pts + pkt ->duration,
284                                         st ->time_base, AV_TIME_BASE_Q);
285     return next_granule > cur_granule;
286 }
287
288 static int ogg_interleave_per_granule(AVFormatContext *s, AVPacket *out, AVPacket *pkt, int flush)
289 {
290     OGGStreamContext *ogg;
291     int i, stream_count = 0;
292     int interleaved = 0;
293
294     if (pkt) {
295         ff_interleave_add_packet(s, pkt, ogg_compare_granule);
296         ogg = s->streams[pkt->stream_index]->priv_data;
297         ogg->packet_count++;
298     }
299
300     for (i = 0; i < s->nb_streams; i++) {
301         ogg = s->streams[i]->priv_data;
302         stream_count += !!ogg->packet_count;
303         interleaved += ogg->packet_count > 1;
304     }
305
306     if ((s->nb_streams == stream_count && interleaved == stream_count) ||
307         (flush && stream_count)) {
308         AVPacketList *pktl= s->packet_buffer;
309         *out= pktl->pkt;
310         s->packet_buffer = pktl->next;
311
312         ogg = s->streams[out->stream_index]->priv_data;
313         if (flush && ogg->packet_count == 1)
314             ogg->eos = 1;
315         ogg->packet_count--;
316
317         if(!s->packet_buffer)
318             s->packet_buffer_end= NULL;
319
320         if(s->streams[out->stream_index]->last_in_packet_buffer == pktl)
321             s->streams[out->stream_index]->last_in_packet_buffer= NULL;
322
323         av_freep(&pktl);
324         return 1;
325     } else {
326         av_init_packet(out);
327         return 0;
328     }
329 }
330
331 static int ogg_write_trailer(AVFormatContext *s)
332 {
333     int i;
334     for (i = 0; i < s->nb_streams; i++) {
335         AVStream *st = s->streams[i];
336         OGGStreamContext *oggstream = st->priv_data;
337         if (st->codec->codec_id == CODEC_ID_FLAC ||
338             st->codec->codec_id == CODEC_ID_SPEEX) {
339             av_free(oggstream->header[0]);
340             av_free(oggstream->header[1]);
341         }
342         av_freep(&st->priv_data);
343     }
344     return 0;
345 }
346
347 AVOutputFormat ogg_muxer = {
348     "ogg",
349     NULL_IF_CONFIG_SMALL("Ogg"),
350     "application/ogg",
351     "ogg,ogv,spx",
352     0,
353     CODEC_ID_FLAC,
354     CODEC_ID_THEORA,
355     ogg_write_header,
356     ogg_write_packet,
357     ogg_write_trailer,
358     .interleave_packet = ogg_interleave_per_granule,
359 };