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             put_byte(pb, codec->thread_count);
 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 };