| 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 | }; |