/* * FFM (ffserver live feed) muxer * Copyright (c) 2001 Fabrice Bellard * * This file is part of FFmpeg. * * FFmpeg is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * * FFmpeg is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with FFmpeg; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ #include "libavutil/intreadwrite.h" #include "libavutil/intfloat.h" #include "libavutil/avassert.h" #include "libavutil/parseutils.h" #include "avformat.h" #include "internal.h" #include "ffm.h" static void flush_packet(AVFormatContext *s) { FFMContext *ffm = s->priv_data; int fill_size, h; AVIOContext *pb = s->pb; fill_size = ffm->packet_end - ffm->packet_ptr; memset(ffm->packet_ptr, 0, fill_size); av_assert1(avio_tell(pb) % ffm->packet_size == 0); /* put header */ avio_wb16(pb, PACKET_ID); avio_wb16(pb, fill_size); avio_wb64(pb, ffm->dts); h = ffm->frame_offset; if (ffm->first_packet) h |= 0x8000; avio_wb16(pb, h); avio_write(pb, ffm->packet, ffm->packet_end - ffm->packet); avio_flush(pb); /* prepare next packet */ ffm->frame_offset = 0; /* no key frame */ ffm->packet_ptr = ffm->packet; ffm->first_packet = 0; } /* 'first' is true if first data of a frame */ static void ffm_write_data(AVFormatContext *s, const uint8_t *buf, int size, int64_t dts, int header) { FFMContext *ffm = s->priv_data; int len; if (header && ffm->frame_offset == 0) { ffm->frame_offset = ffm->packet_ptr - ffm->packet + FFM_HEADER_SIZE; ffm->dts = dts; } /* write as many packets as needed */ while (size > 0) { len = ffm->packet_end - ffm->packet_ptr; if (len > size) len = size; memcpy(ffm->packet_ptr, buf, len); ffm->packet_ptr += len; buf += len; size -= len; if (ffm->packet_ptr >= ffm->packet_end) flush_packet(s); } } static void write_header_chunk(AVIOContext *pb, AVIOContext *dpb, unsigned id) { uint8_t *dyn_buf; int dyn_size= avio_close_dyn_buf(dpb, &dyn_buf); avio_wb32(pb, id); avio_wb32(pb, dyn_size); avio_write(pb, dyn_buf, dyn_size); av_free(dyn_buf); } static int ffm_write_header(AVFormatContext *s) { FFMContext *ffm = s->priv_data; AVDictionaryEntry *t; AVStream *st; AVIOContext *pb = s->pb; AVCodecContext *codec; int bit_rate, i; if (t = av_dict_get(s->metadata, "creation_time", NULL, 0)) { int ret = av_parse_time(&ffm->start_time, t->value, 0); if (ret < 0) return ret; } ffm->packet_size = FFM_PACKET_SIZE; /* header */ avio_wl32(pb, MKTAG('F', 'F', 'M', '2')); avio_wb32(pb, ffm->packet_size); avio_wb64(pb, 0); /* current write position */ if(avio_open_dyn_buf(&pb) < 0) return AVERROR(ENOMEM); avio_wb32(pb, s->nb_streams); bit_rate = 0; for(i=0;i<s->nb_streams;i++) { st = s->streams[i]; bit_rate += st->codec->bit_rate; } avio_wb32(pb, bit_rate); write_header_chunk(s->pb, pb, MKBETAG('M', 'A', 'I', 'N')); /* list of streams */ for(i=0;i<s->nb_streams;i++) { st = s->streams[i]; avpriv_set_pts_info(st, 64, 1, 1000000); if(avio_open_dyn_buf(&pb) < 0) return AVERROR(ENOMEM); codec = st->codec; /* generic info */ avio_wb32(pb, codec->codec_id); avio_w8(pb, codec->codec_type); avio_wb32(pb, codec->bit_rate); avio_wb32(pb, codec->flags); avio_wb32(pb, codec->flags2); avio_wb32(pb, codec->debug); if (codec->flags & CODEC_FLAG_GLOBAL_HEADER) { avio_wb32(pb, codec->extradata_size); avio_write(pb, codec->extradata, codec->extradata_size); } write_header_chunk(s->pb, pb, MKBETAG('C', 'O', 'M', 'M')); if(avio_open_dyn_buf(&pb) < 0) return AVERROR(ENOMEM); /* specific info */ switch(codec->codec_type) { case AVMEDIA_TYPE_VIDEO: avio_wb32(pb, codec->time_base.num); avio_wb32(pb, codec->time_base.den); avio_wb16(pb, codec->width); avio_wb16(pb, codec->height); avio_wb16(pb, codec->gop_size); avio_wb32(pb, codec->pix_fmt); avio_w8(pb, codec->qmin); avio_w8(pb, codec->qmax); avio_w8(pb, codec->max_qdiff); avio_wb16(pb, (int) (codec->qcompress * 10000.0)); avio_wb16(pb, (int) (codec->qblur * 10000.0)); avio_wb32(pb, codec->bit_rate_tolerance); avio_put_str(pb, codec->rc_eq ? codec->rc_eq : "tex^qComp"); avio_wb32(pb, codec->rc_max_rate); avio_wb32(pb, codec->rc_min_rate); avio_wb32(pb, codec->rc_buffer_size); avio_wb64(pb, av_double2int(codec->i_quant_factor)); avio_wb64(pb, av_double2int(codec->b_quant_factor)); avio_wb64(pb, av_double2int(codec->i_quant_offset)); avio_wb64(pb, av_double2int(codec->b_quant_offset)); avio_wb32(pb, codec->dct_algo); avio_wb32(pb, codec->strict_std_compliance); avio_wb32(pb, codec->max_b_frames); avio_wb32(pb, codec->mpeg_quant); avio_wb32(pb, codec->intra_dc_precision); avio_wb32(pb, codec->me_method); avio_wb32(pb, codec->mb_decision); avio_wb32(pb, codec->nsse_weight); avio_wb32(pb, codec->frame_skip_cmp); avio_wb64(pb, av_double2int(codec->rc_buffer_aggressivity)); avio_wb32(pb, codec->codec_tag); avio_w8(pb, codec->thread_count); avio_wb32(pb, codec->coder_type); avio_wb32(pb, codec->me_cmp); avio_wb32(pb, codec->me_subpel_quality); avio_wb32(pb, codec->me_range); avio_wb32(pb, codec->keyint_min); avio_wb32(pb, codec->scenechange_threshold); avio_wb32(pb, codec->b_frame_strategy); avio_wb64(pb, av_double2int(codec->qcompress)); avio_wb64(pb, av_double2int(codec->qblur)); avio_wb32(pb, codec->max_qdiff); avio_wb32(pb, codec->refs); write_header_chunk(s->pb, pb, MKBETAG('S', 'T', 'V', 'I')); break; case AVMEDIA_TYPE_AUDIO: avio_wb32(pb, codec->sample_rate); avio_wl16(pb, codec->channels); avio_wl16(pb, codec->frame_size); write_header_chunk(s->pb, pb, MKBETAG('S', 'T', 'A', 'U')); break; default: return -1; } } pb = s->pb; avio_wb64(pb, 0); // end of header /* flush until end of block reached */ while ((avio_tell(pb) % ffm->packet_size) != 0) avio_w8(pb, 0); avio_flush(pb); /* init packet mux */ ffm->packet_ptr = ffm->packet; ffm->packet_end = ffm->packet + ffm->packet_size - FFM_HEADER_SIZE; av_assert0(ffm->packet_end >= ffm->packet); ffm->frame_offset = 0; ffm->dts = 0; ffm->first_packet = 1; return 0; } static int ffm_write_packet(AVFormatContext *s, AVPacket *pkt) { FFMContext *ffm = s->priv_data; int64_t dts; uint8_t header[FRAME_HEADER_SIZE+4]; int header_size = FRAME_HEADER_SIZE; dts = ffm->start_time + pkt->dts; /* packet size & key_frame */ header[0] = pkt->stream_index; header[1] = 0; if (pkt->flags & AV_PKT_FLAG_KEY) header[1] |= FLAG_KEY_FRAME; AV_WB24(header+2, pkt->size); AV_WB24(header+5, pkt->duration); AV_WB64(header+8, ffm->start_time + pkt->pts); if (pkt->pts != pkt->dts) { header[1] |= FLAG_DTS; AV_WB32(header+16, pkt->pts - pkt->dts); header_size += 4; } ffm_write_data(s, header, header_size, dts, 1); ffm_write_data(s, pkt->data, pkt->size, dts, 0); return 0; } static int ffm_write_trailer(AVFormatContext *s) { FFMContext *ffm = s->priv_data; /* flush packets */ if (ffm->packet_ptr > ffm->packet) flush_packet(s); return 0; } AVOutputFormat ff_ffm_muxer = { .name = "ffm", .long_name = NULL_IF_CONFIG_SMALL("FFM (FFserver live feed)"), .extensions = "ffm", .priv_data_size = sizeof(FFMContext), .audio_codec = AV_CODEC_ID_MP2, .video_codec = AV_CODEC_ID_MPEG1VIDEO, .write_header = ffm_write_header, .write_packet = ffm_write_packet, .write_trailer = ffm_write_trailer, .flags = AVFMT_TS_NEGATIVE, };