| /* |
| * 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 "avformat.h" |
| #include "ffm.h" |
| |
| static void flush_packet(AVFormatContext *s) |
| { |
| FFMContext *ffm = s->priv_data; |
| int fill_size, h; |
| ByteIOContext *pb = s->pb; |
| |
| fill_size = ffm->packet_end - ffm->packet_ptr; |
| memset(ffm->packet_ptr, 0, fill_size); |
| |
| if (url_ftell(pb) % ffm->packet_size) |
| av_abort(); |
| |
| /* put header */ |
| put_be16(pb, PACKET_ID); |
| put_be16(pb, fill_size); |
| put_be64(pb, ffm->dts); |
| h = ffm->frame_offset; |
| if (ffm->first_packet) |
| h |= 0x8000; |
| put_be16(pb, h); |
| put_buffer(pb, ffm->packet, ffm->packet_end - ffm->packet); |
| put_flush_packet(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 int ffm_write_header(AVFormatContext *s) |
| { |
| FFMContext *ffm = s->priv_data; |
| AVStream *st; |
| ByteIOContext *pb = s->pb; |
| AVCodecContext *codec; |
| int bit_rate, i; |
| |
| ffm->packet_size = FFM_PACKET_SIZE; |
| |
| /* header */ |
| put_le32(pb, MKTAG('F', 'F', 'M', '1')); |
| put_be32(pb, ffm->packet_size); |
| put_be64(pb, 0); /* current write position */ |
| |
| put_be32(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; |
| } |
| put_be32(pb, bit_rate); |
| |
| /* list of streams */ |
| for(i=0;i<s->nb_streams;i++) { |
| st = s->streams[i]; |
| av_set_pts_info(st, 64, 1, 1000000); |
| |
| codec = st->codec; |
| /* generic info */ |
| put_be32(pb, codec->codec_id); |
| put_byte(pb, codec->codec_type); |
| put_be32(pb, codec->bit_rate); |
| put_be32(pb, st->quality); |
| put_be32(pb, codec->flags); |
| put_be32(pb, codec->flags2); |
| put_be32(pb, codec->debug); |
| /* specific info */ |
| switch(codec->codec_type) { |
| case CODEC_TYPE_VIDEO: |
| put_be32(pb, codec->time_base.num); |
| put_be32(pb, codec->time_base.den); |
| put_be16(pb, codec->width); |
| put_be16(pb, codec->height); |
| put_be16(pb, codec->gop_size); |
| put_be32(pb, codec->pix_fmt); |
| put_byte(pb, codec->qmin); |
| put_byte(pb, codec->qmax); |
| put_byte(pb, codec->max_qdiff); |
| put_be16(pb, (int) (codec->qcompress * 10000.0)); |
| put_be16(pb, (int) (codec->qblur * 10000.0)); |
| put_be32(pb, codec->bit_rate_tolerance); |
| put_strz(pb, codec->rc_eq ? codec->rc_eq : "tex^qComp"); |
| put_be32(pb, codec->rc_max_rate); |
| put_be32(pb, codec->rc_min_rate); |
| put_be32(pb, codec->rc_buffer_size); |
| put_be64(pb, av_dbl2int(codec->i_quant_factor)); |
| put_be64(pb, av_dbl2int(codec->b_quant_factor)); |
| put_be64(pb, av_dbl2int(codec->i_quant_offset)); |
| put_be64(pb, av_dbl2int(codec->b_quant_offset)); |
| put_be32(pb, codec->dct_algo); |
| put_be32(pb, codec->strict_std_compliance); |
| put_be32(pb, codec->max_b_frames); |
| put_be32(pb, codec->luma_elim_threshold); |
| put_be32(pb, codec->chroma_elim_threshold); |
| put_be32(pb, codec->mpeg_quant); |
| put_be32(pb, codec->intra_dc_precision); |
| put_be32(pb, codec->me_method); |
| put_be32(pb, codec->mb_decision); |
| put_be32(pb, codec->nsse_weight); |
| put_be32(pb, codec->frame_skip_cmp); |
| put_be64(pb, av_dbl2int(codec->rc_buffer_aggressivity)); |
| put_be32(pb, codec->codec_tag); |
| put_byte(pb, codec->thread_count); |
| break; |
| case CODEC_TYPE_AUDIO: |
| put_be32(pb, codec->sample_rate); |
| put_le16(pb, codec->channels); |
| put_le16(pb, codec->frame_size); |
| break; |
| default: |
| return -1; |
| } |
| if (codec->flags & CODEC_FLAG_GLOBAL_HEADER) { |
| put_be32(pb, codec->extradata_size); |
| put_buffer(pb, codec->extradata, codec->extradata_size); |
| } |
| } |
| |
| /* flush until end of block reached */ |
| while ((url_ftell(pb) % ffm->packet_size) != 0) |
| put_byte(pb, 0); |
| |
| put_flush_packet(pb); |
| |
| /* init packet mux */ |
| ffm->packet_ptr = ffm->packet; |
| ffm->packet_end = ffm->packet + ffm->packet_size - FFM_HEADER_SIZE; |
| assert(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) |
| { |
| int64_t dts; |
| uint8_t header[FRAME_HEADER_SIZE+4]; |
| int header_size = FRAME_HEADER_SIZE; |
| |
| dts = s->timestamp + pkt->dts; |
| /* packet size & key_frame */ |
| header[0] = pkt->stream_index; |
| header[1] = 0; |
| if (pkt->flags & PKT_FLAG_KEY) |
| header[1] |= FLAG_KEY_FRAME; |
| AV_WB24(header+2, pkt->size); |
| AV_WB24(header+5, pkt->duration); |
| AV_WB64(header+8, s->timestamp + 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) |
| { |
| ByteIOContext *pb = s->pb; |
| FFMContext *ffm = s->priv_data; |
| |
| /* flush packets */ |
| if (ffm->packet_ptr > ffm->packet) |
| flush_packet(s); |
| |
| put_flush_packet(pb); |
| |
| return 0; |
| } |
| |
| AVOutputFormat ffm_muxer = { |
| "ffm", |
| NULL_IF_CONFIG_SMALL("FFM (FFserver live feed) format"), |
| "", |
| "ffm", |
| sizeof(FFMContext), |
| /* not really used */ |
| CODEC_ID_MP2, |
| CODEC_ID_MPEG1VIDEO, |
| ffm_write_header, |
| ffm_write_packet, |
| ffm_write_trailer, |
| }; |
