do not reset ffm pts, this avoids setting last pts to 0 and screwing up seeking
[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->pts);
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 pts, 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->pts = pts;
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             /* special case : no pts in packet : we leave the current one */
79             if (ffm->pts == 0)
80                 ffm->pts = pts;
81
82             flush_packet(s);
83         }
84     }
85 }
86
87 static int ffm_write_header(AVFormatContext *s)
88 {
89     FFMContext *ffm = s->priv_data;
90     AVStream *st;
91     ByteIOContext *pb = s->pb;
92     AVCodecContext *codec;
93     int bit_rate, i;
94
95     ffm->packet_size = FFM_PACKET_SIZE;
96
97     /* header */
98     put_le32(pb, MKTAG('F', 'F', 'M', '1'));
99     put_be32(pb, ffm->packet_size);
100     /* XXX: store write position in other file ? */
101     put_be64(pb, ffm->packet_size); /* current write position */
102
103     put_be32(pb, s->nb_streams);
104     bit_rate = 0;
105     for(i=0;i<s->nb_streams;i++) {
106         st = s->streams[i];
107         bit_rate += st->codec->bit_rate;
108     }
109     put_be32(pb, bit_rate);
110
111     /* list of streams */
112     for(i=0;i<s->nb_streams;i++) {
113         st = s->streams[i];
114         av_set_pts_info(st, 64, 1, 1000000);
115
116         codec = st->codec;
117         /* generic info */
118         put_be32(pb, codec->codec_id);
119         put_byte(pb, codec->codec_type);
120         put_be32(pb, codec->bit_rate);
121         put_be32(pb, st->quality);
122         put_be32(pb, codec->flags);
123         put_be32(pb, codec->flags2);
124         put_be32(pb, codec->debug);
125         /* specific info */
126         switch(codec->codec_type) {
127         case CODEC_TYPE_VIDEO:
128             put_be32(pb, codec->time_base.num);
129             put_be32(pb, codec->time_base.den);
130             put_be16(pb, codec->width);
131             put_be16(pb, codec->height);
132             put_be16(pb, codec->gop_size);
133             put_be32(pb, codec->pix_fmt);
134             put_byte(pb, codec->qmin);
135             put_byte(pb, codec->qmax);
136             put_byte(pb, codec->max_qdiff);
137             put_be16(pb, (int) (codec->qcompress * 10000.0));
138             put_be16(pb, (int) (codec->qblur * 10000.0));
139             put_be32(pb, codec->bit_rate_tolerance);
140             put_strz(pb, codec->rc_eq);
141             put_be32(pb, codec->rc_max_rate);
142             put_be32(pb, codec->rc_min_rate);
143             put_be32(pb, codec->rc_buffer_size);
144             put_be64(pb, av_dbl2int(codec->i_quant_factor));
145             put_be64(pb, av_dbl2int(codec->b_quant_factor));
146             put_be64(pb, av_dbl2int(codec->i_quant_offset));
147             put_be64(pb, av_dbl2int(codec->b_quant_offset));
148             put_be32(pb, codec->dct_algo);
149             put_be32(pb, codec->strict_std_compliance);
150             put_be32(pb, codec->max_b_frames);
151             put_be32(pb, codec->luma_elim_threshold);
152             put_be32(pb, codec->chroma_elim_threshold);
153             put_be32(pb, codec->mpeg_quant);
154             put_be32(pb, codec->intra_dc_precision);
155             put_be32(pb, codec->me_method);
156             put_be32(pb, codec->mb_decision);
157             put_be32(pb, codec->nsse_weight);
158             put_be32(pb, codec->frame_skip_cmp);
159             put_be64(pb, av_dbl2int(codec->rc_buffer_aggressivity));
160             put_be32(pb, codec->codec_tag);
161             break;
162         case CODEC_TYPE_AUDIO:
163             put_be32(pb, codec->sample_rate);
164             put_le16(pb, codec->channels);
165             put_le16(pb, codec->frame_size);
166             break;
167         default:
168             return -1;
169         }
170         if (codec->flags & CODEC_FLAG_GLOBAL_HEADER) {
171             put_be32(pb, codec->extradata_size);
172             put_buffer(pb, codec->extradata, codec->extradata_size);
173         }
174     }
175
176     /* flush until end of block reached */
177     while ((url_ftell(pb) % ffm->packet_size) != 0)
178         put_byte(pb, 0);
179
180     put_flush_packet(pb);
181
182     /* init packet mux */
183     ffm->packet_ptr = ffm->packet;
184     ffm->packet_end = ffm->packet + ffm->packet_size - FFM_HEADER_SIZE;
185     assert(ffm->packet_end >= ffm->packet);
186     ffm->frame_offset = 0;
187     ffm->pts = 0;
188     ffm->first_packet = 1;
189
190     return 0;
191 }
192
193 static int ffm_write_packet(AVFormatContext *s, AVPacket *pkt)
194 {
195     int64_t pts;
196     uint8_t header[FRAME_HEADER_SIZE];
197     int header_size = FRAME_HEADER_SIZE;
198
199     pts = s->timestamp + pkt->pts;
200     /* packet size & key_frame */
201     header[0] = pkt->stream_index;
202     header[1] = 0;
203     if (pkt->flags & PKT_FLAG_KEY)
204         header[1] |= FLAG_KEY_FRAME;
205     AV_WB24(header+2, pkt->size);
206     AV_WB24(header+5, pkt->duration);
207     AV_WB64(header+8, pts);
208     if (pkt->pts != pkt->dts) {
209         header[1] |= FLAG_DTS;
210         AV_WB32(header+16, pkt->pts - pkt->dts);
211         header_size += 4;
212     }
213     ffm_write_data(s, header, header_size, pts, 1);
214     ffm_write_data(s, pkt->data, pkt->size, pts, 0);
215
216     return 0;
217 }
218
219 static int ffm_write_trailer(AVFormatContext *s)
220 {
221     ByteIOContext *pb = s->pb;
222     FFMContext *ffm = s->priv_data;
223
224     /* flush packets */
225     if (ffm->packet_ptr > ffm->packet)
226         flush_packet(s);
227
228     put_flush_packet(pb);
229
230     if (!url_is_streamed(pb)) {
231         int64_t size;
232         /* update the write offset */
233         size = url_ftell(pb);
234         url_fseek(pb, 8, SEEK_SET);
235         put_be64(pb, size);
236         put_flush_packet(pb);
237     }
238
239     return 0;
240 }
241
242 AVOutputFormat ffm_muxer = {
243     "ffm",
244     NULL_IF_CONFIG_SMALL("ffm format"),
245     "",
246     "ffm",
247     sizeof(FFMContext),
248     /* not really used */
249     CODEC_ID_MP2,
250     CODEC_ID_MPEG1VIDEO,
251     ffm_write_header,
252     ffm_write_packet,
253     ffm_write_trailer,
254 };