Subversion Repositories Kolibri OS

Rev

Go to most recent revision | Blame | Last modification | View Log | RSS feed

  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 "libavutil/intreadwrite.h"
  23. #include "libavutil/intfloat.h"
  24. #include "libavutil/avassert.h"
  25. #include "libavutil/parseutils.h"
  26. #include "avformat.h"
  27. #include "internal.h"
  28. #include "ffm.h"
  29.  
  30. static void flush_packet(AVFormatContext *s)
  31. {
  32.     FFMContext *ffm = s->priv_data;
  33.     int fill_size, h;
  34.     AVIOContext *pb = s->pb;
  35.  
  36.     fill_size = ffm->packet_end - ffm->packet_ptr;
  37.     memset(ffm->packet_ptr, 0, fill_size);
  38.  
  39.     av_assert1(avio_tell(pb) % ffm->packet_size == 0);
  40.  
  41.     /* put header */
  42.     avio_wb16(pb, PACKET_ID);
  43.     avio_wb16(pb, fill_size);
  44.     avio_wb64(pb, ffm->dts);
  45.     h = ffm->frame_offset;
  46.     if (ffm->first_packet)
  47.         h |= 0x8000;
  48.     avio_wb16(pb, h);
  49.     avio_write(pb, ffm->packet, ffm->packet_end - ffm->packet);
  50.     avio_flush(pb);
  51.  
  52.     /* prepare next packet */
  53.     ffm->frame_offset = 0; /* no key frame */
  54.     ffm->packet_ptr = ffm->packet;
  55.     ffm->first_packet = 0;
  56. }
  57.  
  58. /* 'first' is true if first data of a frame */
  59. static void ffm_write_data(AVFormatContext *s,
  60.                            const uint8_t *buf, int size,
  61.                            int64_t dts, int header)
  62. {
  63.     FFMContext *ffm = s->priv_data;
  64.     int len;
  65.  
  66.     if (header && ffm->frame_offset == 0) {
  67.         ffm->frame_offset = ffm->packet_ptr - ffm->packet + FFM_HEADER_SIZE;
  68.         ffm->dts = dts;
  69.     }
  70.  
  71.     /* write as many packets as needed */
  72.     while (size > 0) {
  73.         len = ffm->packet_end - ffm->packet_ptr;
  74.         if (len > size)
  75.             len = size;
  76.         memcpy(ffm->packet_ptr, buf, len);
  77.  
  78.         ffm->packet_ptr += len;
  79.         buf += len;
  80.         size -= len;
  81.         if (ffm->packet_ptr >= ffm->packet_end)
  82.             flush_packet(s);
  83.     }
  84. }
  85.  
  86. static void write_header_chunk(AVIOContext *pb, AVIOContext *dpb, unsigned id)
  87. {
  88.     uint8_t *dyn_buf;
  89.     int dyn_size= avio_close_dyn_buf(dpb, &dyn_buf);
  90.     avio_wb32(pb, id);
  91.     avio_wb32(pb, dyn_size);
  92.     avio_write(pb, dyn_buf, dyn_size);
  93.     av_free(dyn_buf);
  94. }
  95.  
  96. static int ffm_write_header(AVFormatContext *s)
  97. {
  98.     FFMContext *ffm = s->priv_data;
  99.     AVDictionaryEntry *t;
  100.     AVStream *st;
  101.     AVIOContext *pb = s->pb;
  102.     AVCodecContext *codec;
  103.     int bit_rate, i;
  104.  
  105.     if (t = av_dict_get(s->metadata, "creation_time", NULL, 0)) {
  106.         int ret = av_parse_time(&ffm->start_time, t->value, 0);
  107.         if (ret < 0)
  108.             return ret;
  109.     }
  110.  
  111.     ffm->packet_size = FFM_PACKET_SIZE;
  112.  
  113.     /* header */
  114.     avio_wl32(pb, MKTAG('F', 'F', 'M', '2'));
  115.     avio_wb32(pb, ffm->packet_size);
  116.     avio_wb64(pb, 0); /* current write position */
  117.  
  118.     if(avio_open_dyn_buf(&pb) < 0)
  119.         return AVERROR(ENOMEM);
  120.  
  121.     avio_wb32(pb, s->nb_streams);
  122.     bit_rate = 0;
  123.     for(i=0;i<s->nb_streams;i++) {
  124.         st = s->streams[i];
  125.         bit_rate += st->codec->bit_rate;
  126.     }
  127.     avio_wb32(pb, bit_rate);
  128.  
  129.     write_header_chunk(s->pb, pb, MKBETAG('M', 'A', 'I', 'N'));
  130.  
  131.     /* list of streams */
  132.     for(i=0;i<s->nb_streams;i++) {
  133.         st = s->streams[i];
  134.         avpriv_set_pts_info(st, 64, 1, 1000000);
  135.         if(avio_open_dyn_buf(&pb) < 0)
  136.             return AVERROR(ENOMEM);
  137.  
  138.         codec = st->codec;
  139.         /* generic info */
  140.         avio_wb32(pb, codec->codec_id);
  141.         avio_w8(pb, codec->codec_type);
  142.         avio_wb32(pb, codec->bit_rate);
  143.         avio_wb32(pb, codec->flags);
  144.         avio_wb32(pb, codec->flags2);
  145.         avio_wb32(pb, codec->debug);
  146.         if (codec->flags & CODEC_FLAG_GLOBAL_HEADER) {
  147.             avio_wb32(pb, codec->extradata_size);
  148.             avio_write(pb, codec->extradata, codec->extradata_size);
  149.         }
  150.         write_header_chunk(s->pb, pb, MKBETAG('C', 'O', 'M', 'M'));
  151.         if(avio_open_dyn_buf(&pb) < 0)
  152.             return AVERROR(ENOMEM);
  153.         /* specific info */
  154.         switch(codec->codec_type) {
  155.         case AVMEDIA_TYPE_VIDEO:
  156.             avio_wb32(pb, codec->time_base.num);
  157.             avio_wb32(pb, codec->time_base.den);
  158.             avio_wb16(pb, codec->width);
  159.             avio_wb16(pb, codec->height);
  160.             avio_wb16(pb, codec->gop_size);
  161.             avio_wb32(pb, codec->pix_fmt);
  162.             avio_w8(pb, codec->qmin);
  163.             avio_w8(pb, codec->qmax);
  164.             avio_w8(pb, codec->max_qdiff);
  165.             avio_wb16(pb, (int) (codec->qcompress * 10000.0));
  166.             avio_wb16(pb, (int) (codec->qblur * 10000.0));
  167.             avio_wb32(pb, codec->bit_rate_tolerance);
  168.             avio_put_str(pb, codec->rc_eq ? codec->rc_eq : "tex^qComp");
  169.             avio_wb32(pb, codec->rc_max_rate);
  170.             avio_wb32(pb, codec->rc_min_rate);
  171.             avio_wb32(pb, codec->rc_buffer_size);
  172.             avio_wb64(pb, av_double2int(codec->i_quant_factor));
  173.             avio_wb64(pb, av_double2int(codec->b_quant_factor));
  174.             avio_wb64(pb, av_double2int(codec->i_quant_offset));
  175.             avio_wb64(pb, av_double2int(codec->b_quant_offset));
  176.             avio_wb32(pb, codec->dct_algo);
  177.             avio_wb32(pb, codec->strict_std_compliance);
  178.             avio_wb32(pb, codec->max_b_frames);
  179.             avio_wb32(pb, codec->mpeg_quant);
  180.             avio_wb32(pb, codec->intra_dc_precision);
  181.             avio_wb32(pb, codec->me_method);
  182.             avio_wb32(pb, codec->mb_decision);
  183.             avio_wb32(pb, codec->nsse_weight);
  184.             avio_wb32(pb, codec->frame_skip_cmp);
  185.             avio_wb64(pb, av_double2int(codec->rc_buffer_aggressivity));
  186.             avio_wb32(pb, codec->codec_tag);
  187.             avio_w8(pb, codec->thread_count);
  188.             avio_wb32(pb, codec->coder_type);
  189.             avio_wb32(pb, codec->me_cmp);
  190.             avio_wb32(pb, codec->me_subpel_quality);
  191.             avio_wb32(pb, codec->me_range);
  192.             avio_wb32(pb, codec->keyint_min);
  193.             avio_wb32(pb, codec->scenechange_threshold);
  194.             avio_wb32(pb, codec->b_frame_strategy);
  195.             avio_wb64(pb, av_double2int(codec->qcompress));
  196.             avio_wb64(pb, av_double2int(codec->qblur));
  197.             avio_wb32(pb, codec->max_qdiff);
  198.             avio_wb32(pb, codec->refs);
  199.             write_header_chunk(s->pb, pb, MKBETAG('S', 'T', 'V', 'I'));
  200.             break;
  201.         case AVMEDIA_TYPE_AUDIO:
  202.             avio_wb32(pb, codec->sample_rate);
  203.             avio_wl16(pb, codec->channels);
  204.             avio_wl16(pb, codec->frame_size);
  205.             write_header_chunk(s->pb, pb, MKBETAG('S', 'T', 'A', 'U'));
  206.             break;
  207.         default:
  208.             return -1;
  209.         }
  210.     }
  211.     pb = s->pb;
  212.  
  213.     avio_wb64(pb, 0); // end of header
  214.  
  215.     /* flush until end of block reached */
  216.     while ((avio_tell(pb) % ffm->packet_size) != 0)
  217.         avio_w8(pb, 0);
  218.  
  219.     avio_flush(pb);
  220.  
  221.     /* init packet mux */
  222.     ffm->packet_ptr = ffm->packet;
  223.     ffm->packet_end = ffm->packet + ffm->packet_size - FFM_HEADER_SIZE;
  224.     av_assert0(ffm->packet_end >= ffm->packet);
  225.     ffm->frame_offset = 0;
  226.     ffm->dts = 0;
  227.     ffm->first_packet = 1;
  228.  
  229.     return 0;
  230. }
  231.  
  232. static int ffm_write_packet(AVFormatContext *s, AVPacket *pkt)
  233. {
  234.     FFMContext *ffm = s->priv_data;
  235.     int64_t dts;
  236.     uint8_t header[FRAME_HEADER_SIZE+4];
  237.     int header_size = FRAME_HEADER_SIZE;
  238.  
  239.     dts = ffm->start_time + pkt->dts;
  240.     /* packet size & key_frame */
  241.     header[0] = pkt->stream_index;
  242.     header[1] = 0;
  243.     if (pkt->flags & AV_PKT_FLAG_KEY)
  244.         header[1] |= FLAG_KEY_FRAME;
  245.     AV_WB24(header+2, pkt->size);
  246.     AV_WB24(header+5, pkt->duration);
  247.     AV_WB64(header+8, ffm->start_time + pkt->pts);
  248.     if (pkt->pts != pkt->dts) {
  249.         header[1] |= FLAG_DTS;
  250.         AV_WB32(header+16, pkt->pts - pkt->dts);
  251.         header_size += 4;
  252.     }
  253.     ffm_write_data(s, header, header_size, dts, 1);
  254.     ffm_write_data(s, pkt->data, pkt->size, dts, 0);
  255.  
  256.     return 0;
  257. }
  258.  
  259. static int ffm_write_trailer(AVFormatContext *s)
  260. {
  261.     FFMContext *ffm = s->priv_data;
  262.  
  263.     /* flush packets */
  264.     if (ffm->packet_ptr > ffm->packet)
  265.         flush_packet(s);
  266.  
  267.     return 0;
  268. }
  269.  
  270. AVOutputFormat ff_ffm_muxer = {
  271.     .name              = "ffm",
  272.     .long_name         = NULL_IF_CONFIG_SMALL("FFM (FFserver live feed)"),
  273.     .extensions        = "ffm",
  274.     .priv_data_size    = sizeof(FFMContext),
  275.     .audio_codec       = AV_CODEC_ID_MP2,
  276.     .video_codec       = AV_CODEC_ID_MPEG1VIDEO,
  277.     .write_header      = ffm_write_header,
  278.     .write_packet      = ffm_write_packet,
  279.     .write_trailer     = ffm_write_trailer,
  280.     .flags             = AVFMT_TS_NEGATIVE,
  281. };
  282.