2007-09-05 03:22:37 +03:00
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/*
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* Matroska file muxer
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* Copyright (c) 2007 David Conrad
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg 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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* FFmpeg 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 FFmpeg; 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 "avformat.h"
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#include "riff.h"
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#include "matroska.h"
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typedef struct MatroskaMuxContext {
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offset_t segment;
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} MatroskaMuxContext;
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static void put_ebml_id(ByteIOContext *pb, unsigned int id)
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{
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if (id >= 0x3fffff)
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put_byte(pb, id >> 24);
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if (id >= 0x7fff)
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put_byte(pb, id >> 16);
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if (id >= 0xff)
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put_byte(pb, id >> 8);
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put_byte(pb, id);
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}
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// XXX: test this thoroughly and get rid of minbytes hack (currently needed to
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// use up all of the space reserved in start_ebml_master)
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static void put_ebml_size(ByteIOContext *pb, uint64_t size, int minbytes)
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{
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int bytes = minbytes;
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2007-09-05 03:22:39 +03:00
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while (size >> (bytes*7 + 7)) bytes++;
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2007-09-05 03:22:37 +03:00
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// sizes larger than this are currently undefined in EBML
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// XXX: error condition?
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if (size > (1ULL<<56)-1) return;
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put_byte(pb, (0x80 >> bytes) | (size >> bytes*8));
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for (bytes -= 1; bytes >= 0; bytes--)
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put_byte(pb, size >> bytes*8);
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}
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static void put_ebml_uint(ByteIOContext *pb, unsigned int elementid, uint64_t val)
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{
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int bytes = 1;
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while (val >> bytes*8) bytes++;
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put_ebml_id(pb, elementid);
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put_ebml_size(pb, bytes, 0);
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for (bytes -= 1; bytes >= 0; bytes--)
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put_byte(pb, val >> bytes*8);
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}
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//static void put_ebml_sint(ByteIOContext *pb, unsigned int elementid, int64_t val)
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2007-09-05 03:22:47 +03:00
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static void put_ebml_float(ByteIOContext *pb, unsigned int elementid, double val)
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{
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// XXX: single-precision floats?
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put_ebml_id(pb, elementid);
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put_ebml_size(pb, 8, 0);
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put_be64(pb, av_dbl2int(val));
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}
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2007-09-05 03:22:37 +03:00
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static void put_ebml_binary(ByteIOContext *pb, unsigned int elementid,
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2007-09-05 03:22:45 +03:00
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const uint8_t *buf, int size)
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2007-09-05 03:22:37 +03:00
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{
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put_ebml_id(pb, elementid);
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put_ebml_size(pb, size, 0);
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put_buffer(pb, buf, size);
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}
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2007-09-05 03:22:45 +03:00
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static void put_ebml_string(ByteIOContext *pb, unsigned int elementid, const char *str)
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2007-09-05 03:22:37 +03:00
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{
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put_ebml_binary(pb, elementid, str, strlen(str));
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}
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static offset_t start_ebml_master(ByteIOContext *pb, unsigned int elementid)
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{
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put_ebml_id(pb, elementid);
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// XXX: this always reserves the maximum needed space to store any size value
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// we should be smarter (additional parameter for expected size?)
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put_ebml_size(pb, (1ULL<<56)-1, 0); // largest unknown size
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return url_ftell(pb);
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}
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static void end_ebml_master(ByteIOContext *pb, offset_t start)
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{
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offset_t pos = url_ftell(pb);
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url_fseek(pb, start - 8, SEEK_SET);
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put_ebml_size(pb, pos - start, 7);
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url_fseek(pb, pos, SEEK_SET);
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}
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static int mkv_write_header(AVFormatContext *s)
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{
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MatroskaMuxContext *mkv = s->priv_data;
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ByteIOContext *pb = &s->pb;
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offset_t ebml_header, segment_info, tracks;
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int i;
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ebml_header = start_ebml_master(pb, EBML_ID_HEADER);
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2007-09-05 03:22:41 +03:00
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put_ebml_uint (pb, EBML_ID_EBMLVERSION , 1);
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put_ebml_uint (pb, EBML_ID_EBMLREADVERSION , 1);
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put_ebml_uint (pb, EBML_ID_EBMLMAXIDLENGTH , 4);
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put_ebml_uint (pb, EBML_ID_EBMLMAXSIZELENGTH , 8);
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put_ebml_string (pb, EBML_ID_DOCTYPE , "matroska");
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put_ebml_uint (pb, EBML_ID_DOCTYPEVERSION , 1);
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put_ebml_uint (pb, EBML_ID_DOCTYPEREADVERSION , 1);
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2007-09-05 03:22:37 +03:00
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end_ebml_master(pb, ebml_header);
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mkv->segment = start_ebml_master(pb, MATROSKA_ID_SEGMENT);
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segment_info = start_ebml_master(pb, MATROSKA_ID_INFO);
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put_ebml_uint(pb, MATROSKA_ID_TIMECODESCALE, 1000000);
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if (strlen(s->title))
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2007-09-05 03:22:43 +03:00
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put_ebml_string(pb, MATROSKA_ID_TITLE, s->title);
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2007-09-05 03:22:37 +03:00
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if (!(s->streams[0]->codec->flags & CODEC_FLAG_BITEXACT)) {
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2007-09-05 03:22:43 +03:00
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put_ebml_string(pb, MATROSKA_ID_MUXINGAPP, LIBAVFORMAT_IDENT);
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2007-09-05 03:22:37 +03:00
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// XXX: both are required; something better for writing app?
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2007-09-05 03:22:43 +03:00
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put_ebml_string(pb, MATROSKA_ID_WRITINGAPP, LIBAVFORMAT_IDENT);
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2007-09-05 03:22:37 +03:00
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}
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// XXX: segment UID and duration
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end_ebml_master(pb, segment_info);
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tracks = start_ebml_master(pb, MATROSKA_ID_TRACKS);
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for (i = 0; i < s->nb_streams; i++) {
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AVStream *st = s->streams[i];
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offset_t track = start_ebml_master(pb, MATROSKA_ID_TRACKENTRY);
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end_ebml_master(pb, track);
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}
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end_ebml_master(pb, tracks);
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return 0;
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}
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static int mkv_write_packet(AVFormatContext *s, AVPacket *pkt)
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{
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ByteIOContext *pb = &s->pb;
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put_buffer(pb, pkt->data, pkt->size);
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return 0;
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}
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static int mkv_write_trailer(AVFormatContext *s)
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{
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MatroskaMuxContext *mkv = s->priv_data;
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ByteIOContext *pb = &s->pb;
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end_ebml_master(pb, mkv->segment);
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return 0;
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}
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AVOutputFormat matroska_muxer = {
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"matroska",
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"Matroska File Format",
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"video/x-matroska",
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"mkv",
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sizeof(MatroskaMuxContext),
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CODEC_ID_MP2,
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CODEC_ID_MPEG4,
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mkv_write_header,
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mkv_write_packet,
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mkv_write_trailer,
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.codec_tag = (const AVCodecTag*[]){codec_bmp_tags, codec_wav_tags, 0},
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};
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