yading@11: /*
yading@11:  * FFM (ffserver live feed) muxer
yading@11:  * Copyright (c) 2001 Fabrice Bellard
yading@11:  *
yading@11:  * This file is part of FFmpeg.
yading@11:  *
yading@11:  * FFmpeg is free software; you can redistribute it and/or
yading@11:  * modify it under the terms of the GNU Lesser General Public
yading@11:  * License as published by the Free Software Foundation; either
yading@11:  * version 2.1 of the License, or (at your option) any later version.
yading@11:  *
yading@11:  * FFmpeg is distributed in the hope that it will be useful,
yading@11:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
yading@11:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
yading@11:  * Lesser General Public License for more details.
yading@11:  *
yading@11:  * You should have received a copy of the GNU Lesser General Public
yading@11:  * License along with FFmpeg; if not, write to the Free Software
yading@11:  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
yading@11:  */
yading@11: 
yading@11: #include "libavutil/intreadwrite.h"
yading@11: #include "libavutil/intfloat.h"
yading@11: #include "libavutil/avassert.h"
yading@11: #include "libavutil/parseutils.h"
yading@11: #include "avformat.h"
yading@11: #include "internal.h"
yading@11: #include "ffm.h"
yading@11: 
yading@11: static void flush_packet(AVFormatContext *s)
yading@11: {
yading@11:     FFMContext *ffm = s->priv_data;
yading@11:     int fill_size, h;
yading@11:     AVIOContext *pb = s->pb;
yading@11: 
yading@11:     fill_size = ffm->packet_end - ffm->packet_ptr;
yading@11:     memset(ffm->packet_ptr, 0, fill_size);
yading@11: 
yading@11:     av_assert1(avio_tell(pb) % ffm->packet_size == 0);
yading@11: 
yading@11:     /* put header */
yading@11:     avio_wb16(pb, PACKET_ID);
yading@11:     avio_wb16(pb, fill_size);
yading@11:     avio_wb64(pb, ffm->dts);
yading@11:     h = ffm->frame_offset;
yading@11:     if (ffm->first_packet)
yading@11:         h |= 0x8000;
yading@11:     avio_wb16(pb, h);
yading@11:     avio_write(pb, ffm->packet, ffm->packet_end - ffm->packet);
yading@11:     avio_flush(pb);
yading@11: 
yading@11:     /* prepare next packet */
yading@11:     ffm->frame_offset = 0; /* no key frame */
yading@11:     ffm->packet_ptr = ffm->packet;
yading@11:     ffm->first_packet = 0;
yading@11: }
yading@11: 
yading@11: /* 'first' is true if first data of a frame */
yading@11: static void ffm_write_data(AVFormatContext *s,
yading@11:                            const uint8_t *buf, int size,
yading@11:                            int64_t dts, int header)
yading@11: {
yading@11:     FFMContext *ffm = s->priv_data;
yading@11:     int len;
yading@11: 
yading@11:     if (header && ffm->frame_offset == 0) {
yading@11:         ffm->frame_offset = ffm->packet_ptr - ffm->packet + FFM_HEADER_SIZE;
yading@11:         ffm->dts = dts;
yading@11:     }
yading@11: 
yading@11:     /* write as many packets as needed */
yading@11:     while (size > 0) {
yading@11:         len = ffm->packet_end - ffm->packet_ptr;
yading@11:         if (len > size)
yading@11:             len = size;
yading@11:         memcpy(ffm->packet_ptr, buf, len);
yading@11: 
yading@11:         ffm->packet_ptr += len;
yading@11:         buf += len;
yading@11:         size -= len;
yading@11:         if (ffm->packet_ptr >= ffm->packet_end)
yading@11:             flush_packet(s);
yading@11:     }
yading@11: }
yading@11: 
yading@11: static void write_header_chunk(AVIOContext *pb, AVIOContext *dpb, unsigned id)
yading@11: {
yading@11:     uint8_t *dyn_buf;
yading@11:     int dyn_size= avio_close_dyn_buf(dpb, &dyn_buf);
yading@11:     avio_wb32(pb, id);
yading@11:     avio_wb32(pb, dyn_size);
yading@11:     avio_write(pb, dyn_buf, dyn_size);
yading@11:     av_free(dyn_buf);
yading@11: }
yading@11: 
yading@11: static int ffm_write_header(AVFormatContext *s)
yading@11: {
yading@11:     FFMContext *ffm = s->priv_data;
yading@11:     AVDictionaryEntry *t;
yading@11:     AVStream *st;
yading@11:     AVIOContext *pb = s->pb;
yading@11:     AVCodecContext *codec;
yading@11:     int bit_rate, i;
yading@11: 
yading@11:     if (t = av_dict_get(s->metadata, "creation_time", NULL, 0)) {
yading@11:         int ret = av_parse_time(&ffm->start_time, t->value, 0);
yading@11:         if (ret < 0)
yading@11:             return ret;
yading@11:     }
yading@11: 
yading@11:     ffm->packet_size = FFM_PACKET_SIZE;
yading@11: 
yading@11:     /* header */
yading@11:     avio_wl32(pb, MKTAG('F', 'F', 'M', '2'));
yading@11:     avio_wb32(pb, ffm->packet_size);
yading@11:     avio_wb64(pb, 0); /* current write position */
yading@11: 
yading@11:     if(avio_open_dyn_buf(&pb) < 0)
yading@11:         return AVERROR(ENOMEM);
yading@11: 
yading@11:     avio_wb32(pb, s->nb_streams);
yading@11:     bit_rate = 0;
yading@11:     for(i=0;i<s->nb_streams;i++) {
yading@11:         st = s->streams[i];
yading@11:         bit_rate += st->codec->bit_rate;
yading@11:     }
yading@11:     avio_wb32(pb, bit_rate);
yading@11: 
yading@11:     write_header_chunk(s->pb, pb, MKBETAG('M', 'A', 'I', 'N'));
yading@11: 
yading@11:     /* list of streams */
yading@11:     for(i=0;i<s->nb_streams;i++) {
yading@11:         st = s->streams[i];
yading@11:         avpriv_set_pts_info(st, 64, 1, 1000000);
yading@11:         if(avio_open_dyn_buf(&pb) < 0)
yading@11:             return AVERROR(ENOMEM);
yading@11: 
yading@11:         codec = st->codec;
yading@11:         /* generic info */
yading@11:         avio_wb32(pb, codec->codec_id);
yading@11:         avio_w8(pb, codec->codec_type);
yading@11:         avio_wb32(pb, codec->bit_rate);
yading@11:         avio_wb32(pb, codec->flags);
yading@11:         avio_wb32(pb, codec->flags2);
yading@11:         avio_wb32(pb, codec->debug);
yading@11:         if (codec->flags & CODEC_FLAG_GLOBAL_HEADER) {
yading@11:             avio_wb32(pb, codec->extradata_size);
yading@11:             avio_write(pb, codec->extradata, codec->extradata_size);
yading@11:         }
yading@11:         write_header_chunk(s->pb, pb, MKBETAG('C', 'O', 'M', 'M'));
yading@11:         if(avio_open_dyn_buf(&pb) < 0)
yading@11:             return AVERROR(ENOMEM);
yading@11:         /* specific info */
yading@11:         switch(codec->codec_type) {
yading@11:         case AVMEDIA_TYPE_VIDEO:
yading@11:             avio_wb32(pb, codec->time_base.num);
yading@11:             avio_wb32(pb, codec->time_base.den);
yading@11:             avio_wb16(pb, codec->width);
yading@11:             avio_wb16(pb, codec->height);
yading@11:             avio_wb16(pb, codec->gop_size);
yading@11:             avio_wb32(pb, codec->pix_fmt);
yading@11:             avio_w8(pb, codec->qmin);
yading@11:             avio_w8(pb, codec->qmax);
yading@11:             avio_w8(pb, codec->max_qdiff);
yading@11:             avio_wb16(pb, (int) (codec->qcompress * 10000.0));
yading@11:             avio_wb16(pb, (int) (codec->qblur * 10000.0));
yading@11:             avio_wb32(pb, codec->bit_rate_tolerance);
yading@11:             avio_put_str(pb, codec->rc_eq ? codec->rc_eq : "tex^qComp");
yading@11:             avio_wb32(pb, codec->rc_max_rate);
yading@11:             avio_wb32(pb, codec->rc_min_rate);
yading@11:             avio_wb32(pb, codec->rc_buffer_size);
yading@11:             avio_wb64(pb, av_double2int(codec->i_quant_factor));
yading@11:             avio_wb64(pb, av_double2int(codec->b_quant_factor));
yading@11:             avio_wb64(pb, av_double2int(codec->i_quant_offset));
yading@11:             avio_wb64(pb, av_double2int(codec->b_quant_offset));
yading@11:             avio_wb32(pb, codec->dct_algo);
yading@11:             avio_wb32(pb, codec->strict_std_compliance);
yading@11:             avio_wb32(pb, codec->max_b_frames);
yading@11:             avio_wb32(pb, codec->mpeg_quant);
yading@11:             avio_wb32(pb, codec->intra_dc_precision);
yading@11:             avio_wb32(pb, codec->me_method);
yading@11:             avio_wb32(pb, codec->mb_decision);
yading@11:             avio_wb32(pb, codec->nsse_weight);
yading@11:             avio_wb32(pb, codec->frame_skip_cmp);
yading@11:             avio_wb64(pb, av_double2int(codec->rc_buffer_aggressivity));
yading@11:             avio_wb32(pb, codec->codec_tag);
yading@11:             avio_w8(pb, codec->thread_count);
yading@11:             avio_wb32(pb, codec->coder_type);
yading@11:             avio_wb32(pb, codec->me_cmp);
yading@11:             avio_wb32(pb, codec->me_subpel_quality);
yading@11:             avio_wb32(pb, codec->me_range);
yading@11:             avio_wb32(pb, codec->keyint_min);
yading@11:             avio_wb32(pb, codec->scenechange_threshold);
yading@11:             avio_wb32(pb, codec->b_frame_strategy);
yading@11:             avio_wb64(pb, av_double2int(codec->qcompress));
yading@11:             avio_wb64(pb, av_double2int(codec->qblur));
yading@11:             avio_wb32(pb, codec->max_qdiff);
yading@11:             avio_wb32(pb, codec->refs);
yading@11:             write_header_chunk(s->pb, pb, MKBETAG('S', 'T', 'V', 'I'));
yading@11:             break;
yading@11:         case AVMEDIA_TYPE_AUDIO:
yading@11:             avio_wb32(pb, codec->sample_rate);
yading@11:             avio_wl16(pb, codec->channels);
yading@11:             avio_wl16(pb, codec->frame_size);
yading@11:             write_header_chunk(s->pb, pb, MKBETAG('S', 'T', 'A', 'U'));
yading@11:             break;
yading@11:         default:
yading@11:             return -1;
yading@11:         }
yading@11:     }
yading@11:     pb = s->pb;
yading@11: 
yading@11:     avio_wb64(pb, 0); // end of header
yading@11: 
yading@11:     /* flush until end of block reached */
yading@11:     while ((avio_tell(pb) % ffm->packet_size) != 0)
yading@11:         avio_w8(pb, 0);
yading@11: 
yading@11:     avio_flush(pb);
yading@11: 
yading@11:     /* init packet mux */
yading@11:     ffm->packet_ptr = ffm->packet;
yading@11:     ffm->packet_end = ffm->packet + ffm->packet_size - FFM_HEADER_SIZE;
yading@11:     av_assert0(ffm->packet_end >= ffm->packet);
yading@11:     ffm->frame_offset = 0;
yading@11:     ffm->dts = 0;
yading@11:     ffm->first_packet = 1;
yading@11: 
yading@11:     return 0;
yading@11: }
yading@11: 
yading@11: static int ffm_write_packet(AVFormatContext *s, AVPacket *pkt)
yading@11: {
yading@11:     FFMContext *ffm = s->priv_data;
yading@11:     int64_t dts;
yading@11:     uint8_t header[FRAME_HEADER_SIZE+4];
yading@11:     int header_size = FRAME_HEADER_SIZE;
yading@11: 
yading@11:     dts = ffm->start_time + pkt->dts;
yading@11:     /* packet size & key_frame */
yading@11:     header[0] = pkt->stream_index;
yading@11:     header[1] = 0;
yading@11:     if (pkt->flags & AV_PKT_FLAG_KEY)
yading@11:         header[1] |= FLAG_KEY_FRAME;
yading@11:     AV_WB24(header+2, pkt->size);
yading@11:     AV_WB24(header+5, pkt->duration);
yading@11:     AV_WB64(header+8, ffm->start_time + pkt->pts);
yading@11:     if (pkt->pts != pkt->dts) {
yading@11:         header[1] |= FLAG_DTS;
yading@11:         AV_WB32(header+16, pkt->pts - pkt->dts);
yading@11:         header_size += 4;
yading@11:     }
yading@11:     ffm_write_data(s, header, header_size, dts, 1);
yading@11:     ffm_write_data(s, pkt->data, pkt->size, dts, 0);
yading@11: 
yading@11:     return 0;
yading@11: }
yading@11: 
yading@11: static int ffm_write_trailer(AVFormatContext *s)
yading@11: {
yading@11:     FFMContext *ffm = s->priv_data;
yading@11: 
yading@11:     /* flush packets */
yading@11:     if (ffm->packet_ptr > ffm->packet)
yading@11:         flush_packet(s);
yading@11: 
yading@11:     return 0;
yading@11: }
yading@11: 
yading@11: AVOutputFormat ff_ffm_muxer = {
yading@11:     .name              = "ffm",
yading@11:     .long_name         = NULL_IF_CONFIG_SMALL("FFM (FFserver live feed)"),
yading@11:     .extensions        = "ffm",
yading@11:     .priv_data_size    = sizeof(FFMContext),
yading@11:     .audio_codec       = AV_CODEC_ID_MP2,
yading@11:     .video_codec       = AV_CODEC_ID_MPEG1VIDEO,
yading@11:     .write_header      = ffm_write_header,
yading@11:     .write_packet      = ffm_write_packet,
yading@11:     .write_trailer     = ffm_write_trailer,
yading@11: };