mirror of
https://git.ffmpeg.org/ffmpeg.git
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253 lines
8.0 KiB
C
253 lines
8.0 KiB
C
/*
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* FFM (avserver live feed) muxer
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* Copyright (c) 2001 Fabrice Bellard
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*
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* This file is part of Libav.
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*
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* Libav is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* Libav is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with Libav; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "libavutil/intreadwrite.h"
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#include "libavutil/intfloat_readwrite.h"
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#include "avformat.h"
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#include "ffm.h"
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static void flush_packet(AVFormatContext *s)
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{
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FFMContext *ffm = s->priv_data;
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int fill_size, h;
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AVIOContext *pb = s->pb;
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fill_size = ffm->packet_end - ffm->packet_ptr;
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memset(ffm->packet_ptr, 0, fill_size);
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if (avio_tell(pb) % ffm->packet_size)
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av_abort();
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/* put header */
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avio_wb16(pb, PACKET_ID);
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avio_wb16(pb, fill_size);
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avio_wb64(pb, ffm->dts);
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h = ffm->frame_offset;
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if (ffm->first_packet)
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h |= 0x8000;
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avio_wb16(pb, h);
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avio_write(pb, ffm->packet, ffm->packet_end - ffm->packet);
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avio_flush(pb);
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/* prepare next packet */
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ffm->frame_offset = 0; /* no key frame */
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ffm->packet_ptr = ffm->packet;
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ffm->first_packet = 0;
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}
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/* 'first' is true if first data of a frame */
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static void ffm_write_data(AVFormatContext *s,
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const uint8_t *buf, int size,
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int64_t dts, int header)
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{
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FFMContext *ffm = s->priv_data;
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int len;
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if (header && ffm->frame_offset == 0) {
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ffm->frame_offset = ffm->packet_ptr - ffm->packet + FFM_HEADER_SIZE;
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ffm->dts = dts;
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}
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/* write as many packets as needed */
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while (size > 0) {
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len = ffm->packet_end - ffm->packet_ptr;
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if (len > size)
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len = size;
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memcpy(ffm->packet_ptr, buf, len);
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ffm->packet_ptr += len;
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buf += len;
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size -= len;
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if (ffm->packet_ptr >= ffm->packet_end)
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flush_packet(s);
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}
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}
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static int ffm_write_header(AVFormatContext *s)
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{
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FFMContext *ffm = s->priv_data;
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AVStream *st;
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AVIOContext *pb = s->pb;
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AVCodecContext *codec;
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int bit_rate, i;
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ffm->packet_size = FFM_PACKET_SIZE;
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/* header */
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avio_wl32(pb, MKTAG('F', 'F', 'M', '1'));
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avio_wb32(pb, ffm->packet_size);
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avio_wb64(pb, 0); /* current write position */
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avio_wb32(pb, s->nb_streams);
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bit_rate = 0;
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for(i=0;i<s->nb_streams;i++) {
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st = s->streams[i];
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bit_rate += st->codec->bit_rate;
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}
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avio_wb32(pb, bit_rate);
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/* list of streams */
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for(i=0;i<s->nb_streams;i++) {
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st = s->streams[i];
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av_set_pts_info(st, 64, 1, 1000000);
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codec = st->codec;
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/* generic info */
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avio_wb32(pb, codec->codec_id);
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avio_w8(pb, codec->codec_type);
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avio_wb32(pb, codec->bit_rate);
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avio_wb32(pb, codec->flags);
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avio_wb32(pb, codec->flags2);
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avio_wb32(pb, codec->debug);
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/* specific info */
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switch(codec->codec_type) {
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case AVMEDIA_TYPE_VIDEO:
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avio_wb32(pb, codec->time_base.num);
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avio_wb32(pb, codec->time_base.den);
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avio_wb16(pb, codec->width);
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avio_wb16(pb, codec->height);
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avio_wb16(pb, codec->gop_size);
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avio_wb32(pb, codec->pix_fmt);
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avio_w8(pb, codec->qmin);
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avio_w8(pb, codec->qmax);
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avio_w8(pb, codec->max_qdiff);
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avio_wb16(pb, (int) (codec->qcompress * 10000.0));
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avio_wb16(pb, (int) (codec->qblur * 10000.0));
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avio_wb32(pb, codec->bit_rate_tolerance);
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avio_put_str(pb, codec->rc_eq ? codec->rc_eq : "tex^qComp");
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avio_wb32(pb, codec->rc_max_rate);
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avio_wb32(pb, codec->rc_min_rate);
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avio_wb32(pb, codec->rc_buffer_size);
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avio_wb64(pb, av_dbl2int(codec->i_quant_factor));
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avio_wb64(pb, av_dbl2int(codec->b_quant_factor));
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avio_wb64(pb, av_dbl2int(codec->i_quant_offset));
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avio_wb64(pb, av_dbl2int(codec->b_quant_offset));
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avio_wb32(pb, codec->dct_algo);
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avio_wb32(pb, codec->strict_std_compliance);
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avio_wb32(pb, codec->max_b_frames);
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avio_wb32(pb, codec->luma_elim_threshold);
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avio_wb32(pb, codec->chroma_elim_threshold);
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avio_wb32(pb, codec->mpeg_quant);
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avio_wb32(pb, codec->intra_dc_precision);
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avio_wb32(pb, codec->me_method);
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avio_wb32(pb, codec->mb_decision);
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avio_wb32(pb, codec->nsse_weight);
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avio_wb32(pb, codec->frame_skip_cmp);
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avio_wb64(pb, av_dbl2int(codec->rc_buffer_aggressivity));
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avio_wb32(pb, codec->codec_tag);
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avio_w8(pb, codec->thread_count);
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avio_wb32(pb, codec->coder_type);
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avio_wb32(pb, codec->me_cmp);
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avio_wb32(pb, codec->me_subpel_quality);
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avio_wb32(pb, codec->me_range);
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avio_wb32(pb, codec->keyint_min);
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avio_wb32(pb, codec->scenechange_threshold);
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avio_wb32(pb, codec->b_frame_strategy);
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avio_wb64(pb, av_dbl2int(codec->qcompress));
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avio_wb64(pb, av_dbl2int(codec->qblur));
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avio_wb32(pb, codec->max_qdiff);
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avio_wb32(pb, codec->refs);
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break;
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case AVMEDIA_TYPE_AUDIO:
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avio_wb32(pb, codec->sample_rate);
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avio_wl16(pb, codec->channels);
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avio_wl16(pb, codec->frame_size);
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avio_wl16(pb, codec->sample_fmt);
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break;
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default:
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return -1;
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}
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if (codec->flags & CODEC_FLAG_GLOBAL_HEADER) {
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avio_wb32(pb, codec->extradata_size);
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avio_write(pb, codec->extradata, codec->extradata_size);
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}
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}
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/* flush until end of block reached */
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while ((avio_tell(pb) % ffm->packet_size) != 0)
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avio_w8(pb, 0);
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avio_flush(pb);
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/* init packet mux */
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ffm->packet_ptr = ffm->packet;
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ffm->packet_end = ffm->packet + ffm->packet_size - FFM_HEADER_SIZE;
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assert(ffm->packet_end >= ffm->packet);
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ffm->frame_offset = 0;
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ffm->dts = 0;
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ffm->first_packet = 1;
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return 0;
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}
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static int ffm_write_packet(AVFormatContext *s, AVPacket *pkt)
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{
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int64_t dts;
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uint8_t header[FRAME_HEADER_SIZE+4];
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int header_size = FRAME_HEADER_SIZE;
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dts = s->timestamp + pkt->dts;
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/* packet size & key_frame */
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header[0] = pkt->stream_index;
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header[1] = 0;
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if (pkt->flags & AV_PKT_FLAG_KEY)
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header[1] |= FLAG_KEY_FRAME;
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AV_WB24(header+2, pkt->size);
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AV_WB24(header+5, pkt->duration);
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AV_WB64(header+8, s->timestamp + pkt->pts);
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if (pkt->pts != pkt->dts) {
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header[1] |= FLAG_DTS;
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AV_WB32(header+16, pkt->pts - pkt->dts);
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header_size += 4;
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}
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ffm_write_data(s, header, header_size, dts, 1);
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ffm_write_data(s, pkt->data, pkt->size, dts, 0);
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return 0;
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}
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static int ffm_write_trailer(AVFormatContext *s)
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{
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AVIOContext *pb = s->pb;
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FFMContext *ffm = s->priv_data;
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/* flush packets */
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if (ffm->packet_ptr > ffm->packet)
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flush_packet(s);
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avio_flush(pb);
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return 0;
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}
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AVOutputFormat ff_ffm_muxer = {
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.name = "ffm",
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.long_name = NULL_IF_CONFIG_SMALL("FFM (AVserver live feed) format"),
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.mime_type = "",
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.extensions = "ffm",
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.priv_data_size = sizeof(FFMContext),
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.audio_codec = CODEC_ID_MP2,
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.video_codec = CODEC_ID_MPEG1VIDEO,
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.write_header = ffm_write_header,
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.write_packet = ffm_write_packet,
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.write_trailer = ffm_write_trailer,
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};
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