fix size of header data
[ffmpeg.git] / libavformat / ffmenc.c
1 /*
2  * FFM (ffserver live feed) muxer
3  * Copyright (c) 2001 Fabrice Bellard.
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 "avformat.h"
23 #include "ffm.h"
24
25 static void flush_packet(AVFormatContext *s)
26 {
27     FFMContext *ffm = s->priv_data;
28     int fill_size, h;
29     ByteIOContext *pb = s->pb;
30
31     fill_size = ffm->packet_end - ffm->packet_ptr;
32     memset(ffm->packet_ptr, 0, fill_size);
33
34     if (url_ftell(pb) % ffm->packet_size)
35         av_abort();
36
37     /* put header */
38     put_be16(pb, PACKET_ID);
39     put_be16(pb, fill_size);
40     put_be64(pb, ffm->dts);
41     h = ffm->frame_offset;
42     if (ffm->first_packet)
43         h |= 0x8000;
44     put_be16(pb, h);
45     put_buffer(pb, ffm->packet, ffm->packet_end - ffm->packet);
46     put_flush_packet(pb);
47
48     /* prepare next packet */
49     ffm->frame_offset = 0; /* no key frame */
50     ffm->packet_ptr = ffm->packet;
51     ffm->first_packet = 0;
52 }
53
54 /* 'first' is true if first data of a frame */
55 static void ffm_write_data(AVFormatContext *s,
56                            const uint8_t *buf, int size,
57                            int64_t dts, int header)
58 {
59     FFMContext *ffm = s->priv_data;
60     int len;
61
62     if (header && ffm->frame_offset == 0) {
63         ffm->frame_offset = ffm->packet_ptr - ffm->packet + FFM_HEADER_SIZE;
64         ffm->dts = dts;
65     }
66
67     /* write as many packets as needed */
68     while (size > 0) {
69         len = ffm->packet_end - ffm->packet_ptr;
70         if (len > size)
71             len = size;
72         memcpy(ffm->packet_ptr, buf, len);
73
74         ffm->packet_ptr += len;
75         buf += len;
76         size -= len;
77         if (ffm->packet_ptr >= ffm->packet_end)
78             flush_packet(s);
79     }
80 }
81
82 static int ffm_write_header(AVFormatContext *s)
83 {
84     FFMContext *ffm = s->priv_data;
85     AVStream *st;
86     ByteIOContext *pb = s->pb;
87     AVCodecContext *codec;
88     int bit_rate, i;
89
90     ffm->packet_size = FFM_PACKET_SIZE;
91
92     /* header */
93     put_le32(pb, MKTAG('F', 'F', 'M', '1'));
94     put_be32(pb, ffm->packet_size);
95     /* XXX: store write position in other file ? */
96     put_be64(pb, ffm->packet_size); /* current write position */
97
98     put_be32(pb, s->nb_streams);
99     bit_rate = 0;
100     for(i=0;i<s->nb_streams;i++) {
101         st = s->streams[i];
102         bit_rate += st->codec->bit_rate;
103     }
104     put_be32(pb, bit_rate);
105
106     /* list of streams */
107     for(i=0;i<s->nb_streams;i++) {
108         st = s->streams[i];
109         av_set_pts_info(st, 64, 1, 1000000);
110
111         codec = st->codec;
112         /* generic info */
113         put_be32(pb, codec->codec_id);
114         put_byte(pb, codec->codec_type);
115         put_be32(pb, codec->bit_rate);
116         put_be32(pb, st->quality);
117         put_be32(pb, codec->flags);
118         put_be32(pb, codec->flags2);
119         put_be32(pb, codec->debug);
120         /* specific info */
121         switch(codec->codec_type) {
122         case CODEC_TYPE_VIDEO:
123             put_be32(pb, codec->time_base.num);
124             put_be32(pb, codec->time_base.den);
125             put_be16(pb, codec->width);
126             put_be16(pb, codec->height);
127             put_be16(pb, codec->gop_size);
128             put_be32(pb, codec->pix_fmt);
129             put_byte(pb, codec->qmin);
130             put_byte(pb, codec->qmax);
131             put_byte(pb, codec->max_qdiff);
132             put_be16(pb, (int) (codec->qcompress * 10000.0));
133             put_be16(pb, (int) (codec->qblur * 10000.0));
134             put_be32(pb, codec->bit_rate_tolerance);
135             put_strz(pb, codec->rc_eq);
136             put_be32(pb, codec->rc_max_rate);
137             put_be32(pb, codec->rc_min_rate);
138             put_be32(pb, codec->rc_buffer_size);
139             put_be64(pb, av_dbl2int(codec->i_quant_factor));
140             put_be64(pb, av_dbl2int(codec->b_quant_factor));
141             put_be64(pb, av_dbl2int(codec->i_quant_offset));
142             put_be64(pb, av_dbl2int(codec->b_quant_offset));
143             put_be32(pb, codec->dct_algo);
144             put_be32(pb, codec->strict_std_compliance);
145             put_be32(pb, codec->max_b_frames);
146             put_be32(pb, codec->luma_elim_threshold);
147             put_be32(pb, codec->chroma_elim_threshold);
148             put_be32(pb, codec->mpeg_quant);
149             put_be32(pb, codec->intra_dc_precision);
150             put_be32(pb, codec->me_method);
151             put_be32(pb, codec->mb_decision);
152             put_be32(pb, codec->nsse_weight);
153             put_be32(pb, codec->frame_skip_cmp);
154             put_be64(pb, av_dbl2int(codec->rc_buffer_aggressivity));
155             put_be32(pb, codec->codec_tag);
156             put_byte(pb, codec->thread_count);
157             break;
158         case CODEC_TYPE_AUDIO:
159             put_be32(pb, codec->sample_rate);
160             put_le16(pb, codec->channels);
161             put_le16(pb, codec->frame_size);
162             break;
163         default:
164             return -1;
165         }
166         if (codec->flags & CODEC_FLAG_GLOBAL_HEADER) {
167             put_be32(pb, codec->extradata_size);
168             put_buffer(pb, codec->extradata, codec->extradata_size);
169         }
170     }
171
172     /* flush until end of block reached */
173     while ((url_ftell(pb) % ffm->packet_size) != 0)
174         put_byte(pb, 0);
175
176     put_flush_packet(pb);
177
178     /* init packet mux */
179     ffm->packet_ptr = ffm->packet;
180     ffm->packet_end = ffm->packet + ffm->packet_size - FFM_HEADER_SIZE;
181     assert(ffm->packet_end >= ffm->packet);
182     ffm->frame_offset = 0;
183     ffm->dts = 0;
184     ffm->first_packet = 1;
185
186     return 0;
187 }
188
189 static int ffm_write_packet(AVFormatContext *s, AVPacket *pkt)
190 {
191     int64_t dts;
192     uint8_t header[FRAME_HEADER_SIZE+4];
193     int header_size = FRAME_HEADER_SIZE;
194
195     dts = s->timestamp + pkt->dts;
196     /* packet size & key_frame */
197     header[0] = pkt->stream_index;
198     header[1] = 0;
199     if (pkt->flags & PKT_FLAG_KEY)
200         header[1] |= FLAG_KEY_FRAME;
201     AV_WB24(header+2, pkt->size);
202     AV_WB24(header+5, pkt->duration);
203     AV_WB64(header+8, s->timestamp + pkt->pts);
204     if (pkt->pts != pkt->dts) {
205         header[1] |= FLAG_DTS;
206         AV_WB32(header+16, pkt->pts - pkt->dts);
207         header_size += 4;
208     }
209     ffm_write_data(s, header, header_size, dts, 1);
210     ffm_write_data(s, pkt->data, pkt->size, dts, 0);
211
212     return 0;
213 }
214
215 static int ffm_write_trailer(AVFormatContext *s)
216 {
217     ByteIOContext *pb = s->pb;
218     FFMContext *ffm = s->priv_data;
219
220     /* flush packets */
221     if (ffm->packet_ptr > ffm->packet)
222         flush_packet(s);
223
224     put_flush_packet(pb);
225
226     if (!url_is_streamed(pb)) {
227         int64_t size;
228         /* update the write offset */
229         size = url_ftell(pb);
230         url_fseek(pb, 8, SEEK_SET);
231         put_be64(pb, size);
232         put_flush_packet(pb);
233     }
234
235     return 0;
236 }
237
238 AVOutputFormat ffm_muxer = {
239     "ffm",
240     NULL_IF_CONFIG_SMALL("ffm format"),
241     "",
242     "ffm",
243     sizeof(FFMContext),
244     /* not really used */
245     CODEC_ID_MP2,
246     CODEC_ID_MPEG1VIDEO,
247     ffm_write_header,
248     ffm_write_packet,
249     ffm_write_trailer,
250 };