remove now unneeded vars
[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->pts = 0; /* no pts */
51     ffm->packet_ptr = ffm->packet;
52     ffm->first_packet = 0;
53 }
54
55 /* 'first' is true if first data of a frame */
56 static void ffm_write_data(AVFormatContext *s,
57                            const uint8_t *buf, int size,
58                            int64_t pts, int header)
59 {
60     FFMContext *ffm = s->priv_data;
61     int len;
62
63     if (header && ffm->frame_offset == 0)
64         ffm->frame_offset = ffm->packet_ptr - ffm->packet + FFM_HEADER_SIZE;
65     if (header && ffm->pts == 0)
66         ffm->pts = pts;
67
68     /* write as many packets as needed */
69     while (size > 0) {
70         len = ffm->packet_end - ffm->packet_ptr;
71         if (len > size)
72             len = size;
73         memcpy(ffm->packet_ptr, buf, len);
74
75         ffm->packet_ptr += len;
76         buf += len;
77         size -= len;
78         if (ffm->packet_ptr >= ffm->packet_end) {
79             /* special case : no pts in packet : we leave the current one */
80             if (ffm->pts == 0)
81                 ffm->pts = pts;
82
83             flush_packet(s);
84         }
85     }
86 }
87
88 static int ffm_write_header(AVFormatContext *s)
89 {
90     FFMContext *ffm = s->priv_data;
91     AVStream *st;
92     ByteIOContext *pb = s->pb;
93     AVCodecContext *codec;
94     int bit_rate, i;
95
96     ffm->packet_size = FFM_PACKET_SIZE;
97
98     /* header */
99     put_le32(pb, MKTAG('F', 'F', 'M', '1'));
100     put_be32(pb, ffm->packet_size);
101     /* XXX: store write position in other file ? */
102     put_be64(pb, ffm->packet_size); /* current write position */
103
104     put_be32(pb, s->nb_streams);
105     bit_rate = 0;
106     for(i=0;i<s->nb_streams;i++) {
107         st = s->streams[i];
108         bit_rate += st->codec->bit_rate;
109     }
110     put_be32(pb, bit_rate);
111
112     /* list of streams */
113     for(i=0;i<s->nb_streams;i++) {
114         st = s->streams[i];
115         av_set_pts_info(st, 64, 1, 1000000);
116
117         codec = st->codec;
118         /* generic info */
119         put_be32(pb, codec->codec_id);
120         put_byte(pb, codec->codec_type);
121         put_be32(pb, codec->bit_rate);
122         put_be32(pb, st->quality);
123         put_be32(pb, codec->flags);
124         put_be32(pb, codec->flags2);
125         put_be32(pb, codec->debug);
126         /* specific info */
127         switch(codec->codec_type) {
128         case CODEC_TYPE_VIDEO:
129             put_be32(pb, codec->time_base.num);
130             put_be32(pb, codec->time_base.den);
131             put_be16(pb, codec->width);
132             put_be16(pb, codec->height);
133             put_be16(pb, codec->gop_size);
134             put_be32(pb, codec->pix_fmt);
135             put_byte(pb, codec->qmin);
136             put_byte(pb, codec->qmax);
137             put_byte(pb, codec->max_qdiff);
138             put_be16(pb, (int) (codec->qcompress * 10000.0));
139             put_be16(pb, (int) (codec->qblur * 10000.0));
140             put_be32(pb, codec->bit_rate_tolerance);
141             put_strz(pb, codec->rc_eq);
142             put_be32(pb, codec->rc_max_rate);
143             put_be32(pb, codec->rc_min_rate);
144             put_be32(pb, codec->rc_buffer_size);
145             put_be64(pb, av_dbl2int(codec->i_quant_factor));
146             put_be64(pb, av_dbl2int(codec->b_quant_factor));
147             put_be64(pb, av_dbl2int(codec->i_quant_offset));
148             put_be64(pb, av_dbl2int(codec->b_quant_offset));
149             put_be32(pb, codec->dct_algo);
150             put_be32(pb, codec->strict_std_compliance);
151             put_be32(pb, codec->max_b_frames);
152             put_be32(pb, codec->luma_elim_threshold);
153             put_be32(pb, codec->chroma_elim_threshold);
154             put_be32(pb, codec->mpeg_quant);
155             put_be32(pb, codec->intra_dc_precision);
156             put_be32(pb, codec->me_method);
157             put_be32(pb, codec->mb_decision);
158             put_be32(pb, codec->nsse_weight);
159             put_be32(pb, codec->frame_skip_cmp);
160             put_be64(pb, av_dbl2int(codec->rc_buffer_aggressivity));
161             put_be32(pb, codec->codec_tag);
162             break;
163         case CODEC_TYPE_AUDIO:
164             put_be32(pb, codec->sample_rate);
165             put_le16(pb, codec->channels);
166             put_le16(pb, codec->frame_size);
167             break;
168         default:
169             return -1;
170         }
171         if (codec->flags & CODEC_FLAG_GLOBAL_HEADER) {
172             put_be32(pb, codec->extradata_size);
173             put_buffer(pb, codec->extradata, codec->extradata_size);
174         }
175     }
176
177     /* flush until end of block reached */
178     while ((url_ftell(pb) % ffm->packet_size) != 0)
179         put_byte(pb, 0);
180
181     put_flush_packet(pb);
182
183     /* init packet mux */
184     ffm->packet_ptr = ffm->packet;
185     ffm->packet_end = ffm->packet + ffm->packet_size - FFM_HEADER_SIZE;
186     assert(ffm->packet_end >= ffm->packet);
187     ffm->frame_offset = 0;
188     ffm->pts = 0;
189     ffm->first_packet = 1;
190
191     return 0;
192 }
193
194 static int ffm_write_packet(AVFormatContext *s, AVPacket *pkt)
195 {
196     int64_t pts;
197     uint8_t header[FRAME_HEADER_SIZE];
198     int header_size = FRAME_HEADER_SIZE;
199
200     pts = s->timestamp + pkt->pts;
201     /* packet size & key_frame */
202     header[0] = pkt->stream_index;
203     header[1] = 0;
204     if (pkt->flags & PKT_FLAG_KEY)
205         header[1] |= FLAG_KEY_FRAME;
206     AV_WB24(header+2, pkt->size);
207     AV_WB24(header+5, pkt->duration);
208     AV_WB64(header+8, pts);
209     if (pkt->pts != pkt->dts) {
210         header[1] |= FLAG_DTS;
211         AV_WB32(header+16, pkt->pts - pkt->dts);
212         header_size += 4;
213     }
214     ffm_write_data(s, header, header_size, pts, 1);
215     ffm_write_data(s, pkt->data, pkt->size, pts, 0);
216
217     return 0;
218 }
219
220 static int ffm_write_trailer(AVFormatContext *s)
221 {
222     ByteIOContext *pb = s->pb;
223     FFMContext *ffm = s->priv_data;
224
225     /* flush packets */
226     if (ffm->packet_ptr > ffm->packet)
227         flush_packet(s);
228
229     put_flush_packet(pb);
230
231     if (!url_is_streamed(pb)) {
232         int64_t size;
233         /* update the write offset */
234         size = url_ftell(pb);
235         url_fseek(pb, 8, SEEK_SET);
236         put_be64(pb, size);
237         put_flush_packet(pb);
238     }
239
240     return 0;
241 }
242
243 AVOutputFormat ffm_muxer = {
244     "ffm",
245     NULL_IF_CONFIG_SMALL("ffm format"),
246     "",
247     "ffm",
248     sizeof(FFMContext),
249     /* not really used */
250     CODEC_ID_MP2,
251     CODEC_ID_MPEG1VIDEO,
252     ffm_write_header,
253     ffm_write_packet,
254     ffm_write_trailer,
255 };