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  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 "libavutil/opt.h"
  27. #include "avformat.h"
  28. #include "avio_internal.h"
  29. #include "internal.h"
  30. #include "ffm.h"
  31.  
  32. static void flush_packet(AVFormatContext *s)
  33. {
  34.     FFMContext *ffm = s->priv_data;
  35.     int fill_size, h;
  36.     AVIOContext *pb = s->pb;
  37.  
  38.     fill_size = ffm->packet_end - ffm->packet_ptr;
  39.     memset(ffm->packet_ptr, 0, fill_size);
  40.  
  41.     av_assert1(avio_tell(pb) % ffm->packet_size == 0);
  42.  
  43.     /* put header */
  44.     avio_wb16(pb, PACKET_ID);
  45.     avio_wb16(pb, fill_size);
  46.     avio_wb64(pb, ffm->dts);
  47.     h = ffm->frame_offset;
  48.     if (ffm->first_packet)
  49.         h |= 0x8000;
  50.     avio_wb16(pb, h);
  51.     avio_write(pb, ffm->packet, ffm->packet_end - ffm->packet);
  52.     avio_flush(pb);
  53.  
  54.     /* prepare next packet */
  55.     ffm->frame_offset = 0; /* no key frame */
  56.     ffm->packet_ptr = ffm->packet;
  57.     ffm->first_packet = 0;
  58. }
  59.  
  60. /* 'first' is true if first data of a frame */
  61. static void ffm_write_data(AVFormatContext *s,
  62.                            const uint8_t *buf, int size,
  63.                            int64_t dts, int header)
  64. {
  65.     FFMContext *ffm = s->priv_data;
  66.     int len;
  67.  
  68.     if (header && ffm->frame_offset == 0) {
  69.         ffm->frame_offset = ffm->packet_ptr - ffm->packet + FFM_HEADER_SIZE;
  70.         ffm->dts = dts;
  71.     }
  72.  
  73.     /* write as many packets as needed */
  74.     while (size > 0) {
  75.         len = ffm->packet_end - ffm->packet_ptr;
  76.         if (len > size)
  77.             len = size;
  78.         memcpy(ffm->packet_ptr, buf, len);
  79.  
  80.         ffm->packet_ptr += len;
  81.         buf += len;
  82.         size -= len;
  83.         if (ffm->packet_ptr >= ffm->packet_end)
  84.             flush_packet(s);
  85.     }
  86. }
  87.  
  88. static void write_header_chunk(AVIOContext *pb, AVIOContext *dpb, unsigned id)
  89. {
  90.     uint8_t *dyn_buf;
  91.     int dyn_size= avio_close_dyn_buf(dpb, &dyn_buf);
  92.     avio_wb32(pb, id);
  93.     avio_wb32(pb, dyn_size);
  94.     avio_write(pb, dyn_buf, dyn_size);
  95.     av_free(dyn_buf);
  96. }
  97.  
  98. static int ffm_write_header_codec_private_ctx(AVFormatContext *s, AVCodecContext *ctx, int type)
  99. {
  100.     AVIOContext *pb = s->pb;
  101.     AVIOContext *tmp;
  102.     char *buf = NULL;
  103.     int ret;
  104.     const AVCodec *enc = ctx->codec ? ctx->codec : avcodec_find_encoder(ctx->codec_id);
  105.  
  106.     if (!enc) {
  107.         av_log(s, AV_LOG_WARNING, "Stream codec is not found. Codec private options are not stored.\n");
  108.         return 0;
  109.     }
  110.     if (ctx->priv_data && enc->priv_class && enc->priv_data_size) {
  111.         if ((ret = av_opt_serialize(ctx->priv_data, AV_OPT_FLAG_ENCODING_PARAM | type,
  112.                                     AV_OPT_SERIALIZE_SKIP_DEFAULTS, &buf, '=', ',')) < 0)
  113.             return ret;
  114.         if (buf && strlen(buf)) {
  115.             if (avio_open_dyn_buf(&tmp) < 0) {
  116.                 av_free(buf);
  117.                 return AVERROR(ENOMEM);
  118.             }
  119.             avio_put_str(tmp, buf);
  120.             write_header_chunk(pb, tmp, MKBETAG('C', 'P', 'R', 'V'));
  121.         }
  122.         av_free(buf);
  123.     }
  124.     return 0;
  125. }
  126.  
  127. static int ffm_write_header_codec_ctx(AVIOContext *pb, AVCodecContext *ctx, unsigned tag, int type)
  128. {
  129.     AVIOContext *tmp;
  130.     char *buf = NULL;
  131.     int ret, need_coma = 0;
  132.  
  133. #define SKIP_DEFAULTS   AV_OPT_SERIALIZE_SKIP_DEFAULTS
  134. #define OPT_FLAGS_EXACT AV_OPT_SERIALIZE_OPT_FLAGS_EXACT
  135. #define ENC             AV_OPT_FLAG_ENCODING_PARAM
  136.  
  137.     if (avio_open_dyn_buf(&tmp) < 0)
  138.         return AVERROR(ENOMEM);
  139.     if ((ret = av_opt_serialize(ctx, ENC | type, SKIP_DEFAULTS, &buf, '=', ',')) < 0)
  140.         goto fail;
  141.     if (buf && strlen(buf)) {
  142.         avio_write(tmp, buf, strlen(buf));
  143.         av_freep(&buf);
  144.         need_coma = 1;
  145.     }
  146.     if ((ret = av_opt_serialize(ctx, 0, SKIP_DEFAULTS | OPT_FLAGS_EXACT, &buf, '=', ',')) < 0)
  147.         goto fail;
  148.     if (buf && strlen(buf)) {
  149.         if (need_coma)
  150.             avio_w8(tmp, ',');
  151.         avio_write(tmp, buf, strlen(buf));
  152.     }
  153.     av_freep(&buf);
  154.     avio_w8(tmp, 0);
  155.     write_header_chunk(pb, tmp, tag);
  156.     return 0;
  157.   fail:
  158.     av_free(buf);
  159.     ffio_free_dyn_buf(&tmp);
  160.     return ret;
  161.  
  162. #undef SKIP_DEFAULTS
  163. #undef OPT_FLAGS_EXACT
  164. #undef ENC
  165. }
  166.  
  167. static int ffm_write_recommended_config(AVIOContext *pb, AVCodecContext *ctx, unsigned tag,
  168.                                         const char *configuration)
  169. {
  170.     int ret;
  171.     const AVCodec *enc = ctx->codec ? ctx->codec : avcodec_find_encoder(ctx->codec_id);
  172.     AVIOContext *tmp;
  173.     AVDictionaryEntry *t = NULL;
  174.     AVDictionary *all = NULL, *comm = NULL, *prv = NULL;
  175.     char *buf = NULL;
  176.  
  177.     if (!enc || !enc->priv_class || !enc->priv_data_size) {
  178.         /* codec is not known/has no private options, so save everything as common options */
  179.         if (avio_open_dyn_buf(&tmp) < 0)
  180.             return AVERROR(ENOMEM);
  181.         avio_put_str(tmp, configuration);
  182.         write_header_chunk(pb, tmp, tag);
  183.         return 0;
  184.     }
  185.  
  186.     if ((ret = av_dict_parse_string(&all, configuration, "=", ",", 0)) < 0)
  187.         return ret;
  188.  
  189.     while ((t = av_dict_get(all, "", t, AV_DICT_IGNORE_SUFFIX))) {
  190.         if (av_opt_find((void *)&enc->priv_class, t->key, NULL, 0, AV_OPT_SEARCH_FAKE_OBJ)) {
  191.             if ((ret = av_dict_set(&prv, t->key, t->value, 0)) < 0)
  192.                 goto fail;
  193.         } else if ((ret = av_dict_set(&comm, t->key, t->value, 0)) < 0)
  194.             goto fail;
  195.     }
  196.  
  197.     if (comm) {
  198.         if ((ret = av_dict_get_string(comm, &buf, '=', ',')) < 0 ||
  199.             (ret = avio_open_dyn_buf(&tmp)) < 0)
  200.             goto fail;
  201.         avio_put_str(tmp, buf);
  202.         av_freep(&buf);
  203.         write_header_chunk(pb, tmp, tag);
  204.     }
  205.     if (prv) {
  206.         if ((ret = av_dict_get_string(prv, &buf, '=', ',')) < 0 ||
  207.             (ret = avio_open_dyn_buf(&tmp)) < 0)
  208.             goto fail;
  209.         avio_put_str(tmp, buf);
  210.         write_header_chunk(pb, tmp, MKBETAG('C', 'P', 'R', 'V'));
  211.     }
  212.  
  213.   fail:
  214.     av_free(buf);
  215.     av_dict_free(&all);
  216.     av_dict_free(&comm);
  217.     av_dict_free(&prv);
  218.     return ret;
  219. }
  220.  
  221. static int ffm_write_header(AVFormatContext *s)
  222. {
  223.     FFMContext *ffm = s->priv_data;
  224.     AVDictionaryEntry *t;
  225.     AVStream *st;
  226.     AVIOContext *pb = s->pb;
  227.     AVCodecContext *codec;
  228.     int bit_rate, i, ret;
  229.  
  230.     if (t = av_dict_get(s->metadata, "creation_time", NULL, 0)) {
  231.         ret = av_parse_time(&ffm->start_time, t->value, 0);
  232.         if (ret < 0)
  233.             return ret;
  234.     }
  235.  
  236.     ffm->packet_size = FFM_PACKET_SIZE;
  237.  
  238.     /* header */
  239.     avio_wl32(pb, MKTAG('F', 'F', 'M', '2'));
  240.     avio_wb32(pb, ffm->packet_size);
  241.     avio_wb64(pb, 0); /* current write position */
  242.  
  243.     if(avio_open_dyn_buf(&pb) < 0)
  244.         return AVERROR(ENOMEM);
  245.  
  246.     avio_wb32(pb, s->nb_streams);
  247.     bit_rate = 0;
  248.     for(i=0;i<s->nb_streams;i++) {
  249.         st = s->streams[i];
  250.         bit_rate += st->codec->bit_rate;
  251.     }
  252.     avio_wb32(pb, bit_rate);
  253.  
  254.     write_header_chunk(s->pb, pb, MKBETAG('M', 'A', 'I', 'N'));
  255.  
  256.     /* list of streams */
  257.     for(i=0;i<s->nb_streams;i++) {
  258.         st = s->streams[i];
  259.         avpriv_set_pts_info(st, 64, 1, 1000000);
  260.         if(avio_open_dyn_buf(&pb) < 0)
  261.             return AVERROR(ENOMEM);
  262.  
  263.         codec = st->codec;
  264.         /* generic info */
  265.         avio_wb32(pb, codec->codec_id);
  266.         avio_w8(pb, codec->codec_type);
  267.         avio_wb32(pb, codec->bit_rate);
  268.         avio_wb32(pb, codec->flags);
  269.         avio_wb32(pb, codec->flags2);
  270.         avio_wb32(pb, codec->debug);
  271.         if (codec->flags & AV_CODEC_FLAG_GLOBAL_HEADER) {
  272.             avio_wb32(pb, codec->extradata_size);
  273.             avio_write(pb, codec->extradata, codec->extradata_size);
  274.         }
  275.         write_header_chunk(s->pb, pb, MKBETAG('C', 'O', 'M', 'M'));
  276.         /* specific info */
  277.         switch(codec->codec_type) {
  278.         case AVMEDIA_TYPE_VIDEO:
  279.             if (st->recommended_encoder_configuration) {
  280.                 av_log(NULL, AV_LOG_DEBUG, "writing recommended configuration: %s\n",
  281.                        st->recommended_encoder_configuration);
  282.                 if ((ret = ffm_write_recommended_config(s->pb, codec, MKBETAG('S', '2', 'V', 'I'),
  283.                                                         st->recommended_encoder_configuration)) < 0)
  284.                 return ret;
  285.             } else if ((ret = ffm_write_header_codec_ctx(s->pb, codec, MKBETAG('S', '2', 'V', 'I'), AV_OPT_FLAG_VIDEO_PARAM)) < 0 ||
  286.                        (ret = ffm_write_header_codec_private_ctx(s, codec, AV_OPT_FLAG_VIDEO_PARAM)) < 0)
  287.                 return ret;
  288.             break;
  289.         case AVMEDIA_TYPE_AUDIO:
  290.             if (st->recommended_encoder_configuration) {
  291.                 av_log(NULL, AV_LOG_DEBUG, "writing recommended configuration: %s\n",
  292.                        st->recommended_encoder_configuration);
  293.                 if ((ret = ffm_write_recommended_config(s->pb, codec, MKBETAG('S', '2', 'A', 'U'),
  294.                                                         st->recommended_encoder_configuration)) < 0)
  295.                 return ret;
  296.             } else if ((ret = ffm_write_header_codec_ctx(s->pb, codec, MKBETAG('S', '2', 'A', 'U'), AV_OPT_FLAG_AUDIO_PARAM)) < 0 ||
  297.                      (ret = ffm_write_header_codec_private_ctx(s, codec, AV_OPT_FLAG_AUDIO_PARAM)) < 0)
  298.                 return ret;
  299.             break;
  300.         default:
  301.             return -1;
  302.         }
  303.     }
  304.     pb = s->pb;
  305.  
  306.     avio_wb64(pb, 0); // end of header
  307.  
  308.     /* flush until end of block reached */
  309.     while ((avio_tell(pb) % ffm->packet_size) != 0)
  310.         avio_w8(pb, 0);
  311.  
  312.     avio_flush(pb);
  313.  
  314.     /* init packet mux */
  315.     ffm->packet_ptr = ffm->packet;
  316.     ffm->packet_end = ffm->packet + ffm->packet_size - FFM_HEADER_SIZE;
  317.     av_assert0(ffm->packet_end >= ffm->packet);
  318.     ffm->frame_offset = 0;
  319.     ffm->dts = 0;
  320.     ffm->first_packet = 1;
  321.  
  322.     return 0;
  323. }
  324.  
  325. static int ffm_write_packet(AVFormatContext *s, AVPacket *pkt)
  326. {
  327.     FFMContext *ffm = s->priv_data;
  328.     int64_t dts;
  329.     uint8_t header[FRAME_HEADER_SIZE+4];
  330.     int header_size = FRAME_HEADER_SIZE;
  331.  
  332.     dts = ffm->start_time + pkt->dts;
  333.     /* packet size & key_frame */
  334.     header[0] = pkt->stream_index;
  335.     header[1] = 0;
  336.     if (pkt->flags & AV_PKT_FLAG_KEY)
  337.         header[1] |= FLAG_KEY_FRAME;
  338.     AV_WB24(header+2, pkt->size);
  339.     AV_WB24(header+5, pkt->duration);
  340.     AV_WB64(header+8, ffm->start_time + pkt->pts);
  341.     if (pkt->pts != pkt->dts) {
  342.         header[1] |= FLAG_DTS;
  343.         AV_WB32(header+16, pkt->pts - pkt->dts);
  344.         header_size += 4;
  345.     }
  346.     ffm_write_data(s, header, header_size, dts, 1);
  347.     ffm_write_data(s, pkt->data, pkt->size, dts, 0);
  348.  
  349.     return 0;
  350. }
  351.  
  352. static int ffm_write_trailer(AVFormatContext *s)
  353. {
  354.     FFMContext *ffm = s->priv_data;
  355.  
  356.     /* flush packets */
  357.     if (ffm->packet_ptr > ffm->packet)
  358.         flush_packet(s);
  359.  
  360.     return 0;
  361. }
  362.  
  363. AVOutputFormat ff_ffm_muxer = {
  364.     .name              = "ffm",
  365.     .long_name         = NULL_IF_CONFIG_SMALL("FFM (FFserver live feed)"),
  366.     .extensions        = "ffm",
  367.     .priv_data_size    = sizeof(FFMContext),
  368.     .audio_codec       = AV_CODEC_ID_MP2,
  369.     .video_codec       = AV_CODEC_ID_MPEG1VIDEO,
  370.     .write_header      = ffm_write_header,
  371.     .write_packet      = ffm_write_packet,
  372.     .write_trailer     = ffm_write_trailer,
  373.     .flags             = AVFMT_TS_NEGATIVE,
  374. };
  375.