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ffmpeg / libavformat / matroskaenc.c @ 3abe5fbd

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1 67143c0f David Conrad
/*
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 * Matroska muxer
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 * Copyright (c) 2007 David Conrad
4
 *
5
 * This file is part of FFmpeg.
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 *
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 * FFmpeg is free software; you can redistribute it and/or
8
 * modify it under the terms of the GNU Lesser General Public
9
 * License as published by the Free Software Foundation; either
10
 * version 2.1 of the License, or (at your option) any later version.
11
 *
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 * FFmpeg is distributed in the hope that it will be useful,
13
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
15
 * 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 "md5.h"
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#include "riff.h"
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#include "xiph.h"
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#include "matroska.h"
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28 baf71dca David Conrad
typedef struct ebml_master {
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    offset_t        pos;                ///< absolute offset in the file where the master's elements start
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    int             sizebytes;          ///< how many bytes were reserved for the size
31
} ebml_master;
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33 967d815a David Conrad
typedef struct mkv_seekhead_entry {
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    unsigned int    elementid;
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    uint64_t        segmentpos;
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} mkv_seekhead_entry;
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38
typedef struct mkv_seekhead {
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    offset_t                filepos;
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    offset_t                segment_offset;     ///< the file offset to the beginning of the segment
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    int                     reserved_size;      ///< -1 if appending to file
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    int                     max_entries;
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    mkv_seekhead_entry      *entries;
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    int                     num_entries;
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} mkv_seekhead;
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47 6364d534 David Conrad
typedef struct {
48
    uint64_t        pts;
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    int             tracknum;
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    offset_t        cluster_pos;        ///< file offset of the cluster containing the block
51
} mkv_cuepoint;
52
53
typedef struct {
54
    offset_t        segment_offset;
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    mkv_cuepoint    *entries;
56
    int             num_entries;
57
} mkv_cues;
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typedef struct MatroskaMuxContext {
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    ebml_master     segment;
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    offset_t        segment_offset;
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    offset_t        segment_uid;
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    ebml_master     cluster;
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    offset_t        cluster_pos;        ///< file offset of the current cluster
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    uint64_t        cluster_pts;
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    offset_t        duration_offset;
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    uint64_t        duration;
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    mkv_seekhead    *main_seekhead;
69
    mkv_seekhead    *cluster_seekhead;
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    mkv_cues        *cues;
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    struct AVMD5    *md5_ctx;
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} MatroskaMuxContext;
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75 baf71dca David Conrad
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/** 2 bytes * 3 for EBML IDs, 3 1-byte EBML lengths, 8 bytes for 64 bit
77
 * offset, 4 bytes for target EBML ID */
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#define MAX_SEEKENTRY_SIZE 21
79
80 e3cd80cd David Conrad
/** per-cuepoint-track - 3 1-byte EBML IDs, 3 1-byte EBML sizes, 2
81
 * 8-byte uint max */
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#define MAX_CUETRACKPOS_SIZE 22
83
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/** per-cuepoint - 2 1-byte EBML IDs, 2 1-byte EBML sizes, 8-byte uint max */
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#define MAX_CUEPOINT_SIZE(num_tracks) 12 + MAX_CUETRACKPOS_SIZE*num_tracks
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static int ebml_id_size(unsigned int id)
89
{
90
    return (av_log2(id+1)-1)/7+1;
91
}
92
93 67143c0f David Conrad
static void put_ebml_id(ByteIOContext *pb, unsigned int id)
94
{
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    int i = ebml_id_size(id);
96
    while (i--)
97
        put_byte(pb, id >> (i*8));
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}
99
100 ec8f4ad9 David Conrad
/**
101 bf898960 Diego Biurrun
 * Write an EBML size meaning "unknown size".
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 *
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 * @param bytes The number of bytes the size should occupy (maximum: 8).
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 */
105
static void put_ebml_size_unknown(ByteIOContext *pb, int bytes)
106
{
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    assert(bytes <= 8);
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    put_byte(pb, 0x1ff >> bytes);
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    while (--bytes)
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        put_byte(pb, 0xff);
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}
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/**
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 * Calculate how many bytes are needed to represent a given number in EBML.
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 */
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static int ebml_num_size(uint64_t num)
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{
118
    int bytes = 1;
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    while ((num+1) >> bytes*7) bytes++;
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    return bytes;
121
}
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/**
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 * Write a number in EBML variable length format.
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 *
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 * @param bytes The number of bytes that need to be used to write the number.
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 *              If zero, any number of bytes can be used.
128
 */
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static void put_ebml_num(ByteIOContext *pb, uint64_t num, int bytes)
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{
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    int i, needed_bytes = ebml_num_size(num);
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    // sizes larger than this are currently undefined in EBML
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    assert(num < (1ULL<<56)-1);
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    if (bytes == 0)
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        // don't care how many bytes are used, so use the min
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        bytes = needed_bytes;
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    // the bytes needed to write the given size would exceed the bytes
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    // that we need to use, so write unknown size. This shouldn't happen.
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    assert(bytes >= needed_bytes);
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    num |= 1ULL << bytes*7;
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    for (i = bytes - 1; i >= 0; i--)
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        put_byte(pb, num >> i*8);
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}
147
148
static void put_ebml_uint(ByteIOContext *pb, unsigned int elementid, uint64_t val)
149
{
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    int i, bytes = 1;
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    while (val >> bytes*8) bytes++;
152
153
    put_ebml_id(pb, elementid);
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    put_ebml_num(pb, bytes, 0);
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    for (i = bytes - 1; i >= 0; i--)
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        put_byte(pb, val >> i*8);
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}
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static void put_ebml_float(ByteIOContext *pb, unsigned int elementid, double val)
160
{
161
    put_ebml_id(pb, elementid);
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    put_ebml_num(pb, 8, 0);
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    put_be64(pb, av_dbl2int(val));
164
}
165
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static void put_ebml_binary(ByteIOContext *pb, unsigned int elementid,
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                            const uint8_t *buf, int size)
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{
169
    put_ebml_id(pb, elementid);
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    put_ebml_num(pb, size, 0);
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    put_buffer(pb, buf, size);
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}
173
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static void put_ebml_string(ByteIOContext *pb, unsigned int elementid, const char *str)
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{
176
    put_ebml_binary(pb, elementid, str, strlen(str));
177
}
178
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/**
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 * Writes a void element of a given size. Useful for reserving space in
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 * the file to be written to later.
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 *
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 * @param size The number of bytes to reserve, which must be at least 2.
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 */
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static void put_ebml_void(ByteIOContext *pb, uint64_t size)
186
{
187
    offset_t currentpos = url_ftell(pb);
188
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    assert(size >= 2);
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    put_ebml_id(pb, EBML_ID_VOID);
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    // we need to subtract the length needed to store the size from the
193
    // size we need to reserve so 2 cases, we use 8 bytes to store the
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    // size if possible, 1 byte otherwise
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    if (size < 10)
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        put_ebml_num(pb, size-1, 0);
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    else
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        put_ebml_num(pb, size-9, 8);
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    url_fseek(pb, currentpos + size, SEEK_SET);
200
}
201
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static ebml_master start_ebml_master(ByteIOContext *pb, unsigned int elementid, uint64_t expectedsize)
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{
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    int bytes = expectedsize ? ebml_num_size(expectedsize) : 8;
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    put_ebml_id(pb, elementid);
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    put_ebml_size_unknown(pb, bytes);
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    return (ebml_master){ url_ftell(pb), bytes };
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}
209
210 baf71dca David Conrad
static void end_ebml_master(ByteIOContext *pb, ebml_master master)
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{
212
    offset_t pos = url_ftell(pb);
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    // leave the unknown size for masters when streaming
215
    if (url_is_streamed(pb))
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        return;
217
218 baf71dca David Conrad
    url_fseek(pb, master.pos - master.sizebytes, SEEK_SET);
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    put_ebml_num(pb, pos - master.pos, master.sizebytes);
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    url_fseek(pb, pos, SEEK_SET);
221
}
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223 86be6637 David Conrad
static void put_xiph_size(ByteIOContext *pb, int size)
224
{
225
    int i;
226
    for (i = 0; i < size / 255; i++)
227
        put_byte(pb, 255);
228
    put_byte(pb, size % 255);
229
}
230
231 57848e9a David Conrad
/**
232 cfde5d18 David Conrad
 * Initialize a mkv_seekhead element to be ready to index level 1 Matroska
233
 * elements. If a maximum number of elements is specified, enough space
234
 * will be reserved at the current file location to write a seek head of
235
 * that size.
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 *
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 * @param segment_offset The absolute offset to the position in the file
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 *                       where the segment begins.
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 * @param numelements The maximum number of elements that will be indexed
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 *                    by this seek head, 0 if unlimited.
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 */
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static mkv_seekhead * mkv_start_seekhead(ByteIOContext *pb, offset_t segment_offset, int numelements)
243
{
244
    mkv_seekhead *new_seekhead = av_mallocz(sizeof(mkv_seekhead));
245
    if (new_seekhead == NULL)
246
        return NULL;
247
248
    new_seekhead->segment_offset = segment_offset;
249
250
    if (numelements > 0) {
251
        new_seekhead->filepos = url_ftell(pb);
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        // 21 bytes max for a seek entry, 10 bytes max for the SeekHead ID
253
        // and size, and 3 bytes to guarantee that an EBML void element
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        // will fit afterwards
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        new_seekhead->reserved_size = numelements * MAX_SEEKENTRY_SIZE + 13;
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        new_seekhead->max_entries = numelements;
257
        put_ebml_void(pb, new_seekhead->reserved_size);
258
    }
259
    return new_seekhead;
260
}
261
262
static int mkv_add_seekhead_entry(mkv_seekhead *seekhead, unsigned int elementid, uint64_t filepos)
263
{
264
    mkv_seekhead_entry *entries = seekhead->entries;
265
266
    // don't store more elements than we reserved space for
267
    if (seekhead->max_entries > 0 && seekhead->max_entries <= seekhead->num_entries)
268
        return -1;
269
270
    entries = av_realloc(entries, (seekhead->num_entries + 1) * sizeof(mkv_seekhead_entry));
271
    if (entries == NULL)
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        return AVERROR(ENOMEM);
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    entries[seekhead->num_entries  ].elementid = elementid;
275
    entries[seekhead->num_entries++].segmentpos = filepos - seekhead->segment_offset;
276 967d815a David Conrad
277
    seekhead->entries = entries;
278
    return 0;
279
}
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281 57848e9a David Conrad
/**
282 cfde5d18 David Conrad
 * Write the seek head to the file and free it. If a maximum number of
283
 * elements was specified to mkv_start_seekhead(), the seek head will
284
 * be written at the location reserved for it. Otherwise, it is written
285
 * at the current location in the file.
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 *
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 * @return The file offset where the seekhead was written.
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 */
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static offset_t mkv_write_seekhead(ByteIOContext *pb, mkv_seekhead *seekhead)
290
{
291 baf71dca David Conrad
    ebml_master metaseek, seekentry;
292
    offset_t currentpos;
293 967d815a David Conrad
    int i;
294
295
    currentpos = url_ftell(pb);
296
297
    if (seekhead->reserved_size > 0)
298
        url_fseek(pb, seekhead->filepos, SEEK_SET);
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300 baf71dca David Conrad
    metaseek = start_ebml_master(pb, MATROSKA_ID_SEEKHEAD, seekhead->reserved_size);
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    for (i = 0; i < seekhead->num_entries; i++) {
302
        mkv_seekhead_entry *entry = &seekhead->entries[i];
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304 baf71dca David Conrad
        seekentry = start_ebml_master(pb, MATROSKA_ID_SEEKENTRY, MAX_SEEKENTRY_SIZE);
305 967d815a David Conrad
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        put_ebml_id(pb, MATROSKA_ID_SEEKID);
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        put_ebml_num(pb, ebml_id_size(entry->elementid), 0);
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        put_ebml_id(pb, entry->elementid);
309
310
        put_ebml_uint(pb, MATROSKA_ID_SEEKPOSITION, entry->segmentpos);
311
        end_ebml_master(pb, seekentry);
312
    }
313
    end_ebml_master(pb, metaseek);
314
315
    if (seekhead->reserved_size > 0) {
316
        uint64_t remaining = seekhead->filepos + seekhead->reserved_size - url_ftell(pb);
317
        put_ebml_void(pb, remaining);
318
        url_fseek(pb, currentpos, SEEK_SET);
319
320
        currentpos = seekhead->filepos;
321
    }
322
    av_free(seekhead->entries);
323
    av_free(seekhead);
324
325
    return currentpos;
326
}
327
328 6364d534 David Conrad
static mkv_cues * mkv_start_cues(offset_t segment_offset)
329
{
330
    mkv_cues *cues = av_mallocz(sizeof(mkv_cues));
331
    if (cues == NULL)
332
        return NULL;
333
334
    cues->segment_offset = segment_offset;
335
    return cues;
336
}
337
338
static int mkv_add_cuepoint(mkv_cues *cues, AVPacket *pkt, offset_t cluster_pos)
339
{
340
    mkv_cuepoint *entries = cues->entries;
341
342
    entries = av_realloc(entries, (cues->num_entries + 1) * sizeof(mkv_cuepoint));
343
    if (entries == NULL)
344 0b38843a David Conrad
        return AVERROR(ENOMEM);
345 6364d534 David Conrad
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    entries[cues->num_entries  ].pts = pkt->pts;
347
    entries[cues->num_entries  ].tracknum = pkt->stream_index + 1;
348
    entries[cues->num_entries++].cluster_pos = cluster_pos - cues->segment_offset;
349 6364d534 David Conrad
350
    cues->entries = entries;
351
    return 0;
352
}
353
354 baf71dca David Conrad
static offset_t mkv_write_cues(ByteIOContext *pb, mkv_cues *cues, int num_tracks)
355 6364d534 David Conrad
{
356 baf71dca David Conrad
    ebml_master cues_element;
357
    offset_t currentpos;
358 6364d534 David Conrad
    int i, j;
359
360
    currentpos = url_ftell(pb);
361 baf71dca David Conrad
    cues_element = start_ebml_master(pb, MATROSKA_ID_CUES, 0);
362 6364d534 David Conrad
363
    for (i = 0; i < cues->num_entries; i++) {
364 baf71dca David Conrad
        ebml_master cuepoint, track_positions;
365 6364d534 David Conrad
        mkv_cuepoint *entry = &cues->entries[i];
366
        uint64_t pts = entry->pts;
367
368 baf71dca David Conrad
        cuepoint = start_ebml_master(pb, MATROSKA_ID_POINTENTRY, MAX_CUEPOINT_SIZE(num_tracks));
369 6364d534 David Conrad
        put_ebml_uint(pb, MATROSKA_ID_CUETIME, pts);
370
371
        // put all the entries from different tracks that have the exact same
372
        // timestamp into the same CuePoint
373
        for (j = 0; j < cues->num_entries - i && entry[j].pts == pts; j++) {
374 baf71dca David Conrad
            track_positions = start_ebml_master(pb, MATROSKA_ID_CUETRACKPOSITION, MAX_CUETRACKPOS_SIZE);
375 6364d534 David Conrad
            put_ebml_uint(pb, MATROSKA_ID_CUETRACK          , entry[j].tracknum   );
376
            put_ebml_uint(pb, MATROSKA_ID_CUECLUSTERPOSITION, entry[j].cluster_pos);
377
            end_ebml_master(pb, track_positions);
378
        }
379
        i += j - 1;
380
        end_ebml_master(pb, cuepoint);
381
    }
382
    end_ebml_master(pb, cues_element);
383
384
    av_free(cues->entries);
385
    av_free(cues);
386
    return currentpos;
387
}
388
389 b62a33d0 David Conrad
static int put_xiph_codecpriv(AVFormatContext *s, ByteIOContext *pb, AVCodecContext *codec)
390 56d55a3b David Conrad
{
391
    uint8_t *header_start[3];
392
    int header_len[3];
393
    int first_header_size;
394 86be6637 David Conrad
    int j;
395 56d55a3b David Conrad
396
    if (codec->codec_id == CODEC_ID_VORBIS)
397
        first_header_size = 30;
398
    else
399
        first_header_size = 42;
400
401
    if (ff_split_xiph_headers(codec->extradata, codec->extradata_size,
402
                              first_header_size, header_start, header_len) < 0) {
403 b62a33d0 David Conrad
        av_log(s, AV_LOG_ERROR, "Extradata corrupt.\n");
404 56d55a3b David Conrad
        return -1;
405
    }
406
407
    put_byte(pb, 2);                    // number packets - 1
408
    for (j = 0; j < 2; j++) {
409 86be6637 David Conrad
        put_xiph_size(pb, header_len[j]);
410 56d55a3b David Conrad
    }
411
    for (j = 0; j < 3; j++)
412
        put_buffer(pb, header_start[j], header_len[j]);
413 801edb42 David Conrad
414
    return 0;
415 56d55a3b David Conrad
}
416 67143c0f David Conrad
417 8a39497c David Conrad
#define FLAC_STREAMINFO_SIZE 34
418
419 b62a33d0 David Conrad
static int put_flac_codecpriv(AVFormatContext *s, ByteIOContext *pb, AVCodecContext *codec)
420 8a39497c David Conrad
{
421
    // if the extradata_size is greater than FLAC_STREAMINFO_SIZE,
422
    // assume that it's in Matroska's format already
423
    if (codec->extradata_size < FLAC_STREAMINFO_SIZE) {
424 b62a33d0 David Conrad
        av_log(s, AV_LOG_ERROR, "Invalid FLAC extradata\n");
425 8a39497c David Conrad
        return -1;
426
    } else if (codec->extradata_size == FLAC_STREAMINFO_SIZE) {
427
        // only the streaminfo packet
428
        put_byte(pb, 0);
429
        put_xiph_size(pb, codec->extradata_size);
430 b62a33d0 David Conrad
        av_log(s, AV_LOG_ERROR, "Only one packet\n");
431 8a39497c David Conrad
    }
432
    put_buffer(pb, codec->extradata, codec->extradata_size);
433
    return 0;
434
}
435
436 b62a33d0 David Conrad
static void get_aac_sample_rates(AVFormatContext *s, AVCodecContext *codec, int *sample_rate, int *output_sample_rate)
437 07918a22 David Conrad
{
438
    static const int aac_sample_rates[] = {
439
        96000, 88200, 64000, 48000, 44100, 32000,
440
        24000, 22050, 16000, 12000, 11025,  8000,
441
    };
442
    int sri;
443
444
    if (codec->extradata_size < 2) {
445 ab332d01 David Conrad
        av_log(s, AV_LOG_WARNING, "No AAC extradata, unable to determine samplerate.\n");
446 07918a22 David Conrad
        return;
447
    }
448
449
    sri = ((codec->extradata[0] << 1) & 0xE) | (codec->extradata[1] >> 7);
450
    if (sri > 12) {
451 b62a33d0 David Conrad
        av_log(s, AV_LOG_WARNING, "AAC samplerate index out of bounds\n");
452 07918a22 David Conrad
        return;
453
    }
454
    *sample_rate = aac_sample_rates[sri];
455
456
    // if sbr, get output sample rate as well
457
    if (codec->extradata_size == 5) {
458
        sri = (codec->extradata[4] >> 3) & 0xF;
459
        if (sri > 12) {
460 b62a33d0 David Conrad
            av_log(s, AV_LOG_WARNING, "AAC output samplerate index out of bounds\n");
461 07918a22 David Conrad
            return;
462
        }
463
        *output_sample_rate = aac_sample_rates[sri];
464
    }
465
}
466
467 b62a33d0 David Conrad
static int mkv_write_codecprivate(AVFormatContext *s, ByteIOContext *pb, AVCodecContext *codec, int native_id)
468 5c559894 David Conrad
{
469 899681cd Björn Axelsson
    ByteIOContext *dyn_cp;
470 46d18a88 David Conrad
    uint8_t *codecpriv;
471 899681cd Björn Axelsson
    int ret, codecpriv_size;
472 46d18a88 David Conrad
473 899681cd Björn Axelsson
    ret = url_open_dyn_buf(&dyn_cp);
474
    if(ret < 0)
475
        return ret;
476 5c559894 David Conrad
477
    if (native_id) {
478 c301d5ae David Conrad
        if (codec->codec_id == CODEC_ID_VORBIS || codec->codec_id == CODEC_ID_THEORA)
479 899681cd Björn Axelsson
            ret = put_xiph_codecpriv(s, dyn_cp, codec);
480 c301d5ae David Conrad
        else if (codec->codec_id == CODEC_ID_FLAC)
481 899681cd Björn Axelsson
            ret = put_flac_codecpriv(s, dyn_cp, codec);
482 c301d5ae David Conrad
        else if (codec->extradata_size)
483 899681cd Björn Axelsson
            put_buffer(dyn_cp, codec->extradata, codec->extradata_size);
484 5c559894 David Conrad
    } else if (codec->codec_type == CODEC_TYPE_VIDEO) {
485
        if (!codec->codec_tag)
486
            codec->codec_tag = codec_get_tag(codec_bmp_tags, codec->codec_id);
487 dc4a9f67 David Conrad
        if (!codec->codec_tag) {
488 ab332d01 David Conrad
            av_log(s, AV_LOG_ERROR, "No bmp codec ID found.");
489 dc4a9f67 David Conrad
            ret = -1;
490
        }
491 5c559894 David Conrad
492 899681cd Björn Axelsson
        put_bmp_header(dyn_cp, codec, codec_bmp_tags, 0);
493 5c559894 David Conrad
494
    } else if (codec->codec_type == CODEC_TYPE_AUDIO) {
495 dc4a9f67 David Conrad
        if (!codec->codec_tag)
496 7e33d3fe David Conrad
            codec->codec_tag = codec_get_tag(codec_wav_tags, codec->codec_id);
497 5c559894 David Conrad
        if (!codec->codec_tag) {
498 ab332d01 David Conrad
            av_log(s, AV_LOG_ERROR, "No wav codec ID found.");
499 46d18a88 David Conrad
            ret = -1;
500 5c559894 David Conrad
        }
501
502 899681cd Björn Axelsson
        put_wav_header(dyn_cp, codec);
503 5c559894 David Conrad
    }
504 46d18a88 David Conrad
505 899681cd Björn Axelsson
    codecpriv_size = url_close_dyn_buf(dyn_cp, &codecpriv);
506 46d18a88 David Conrad
    if (codecpriv_size)
507
        put_ebml_binary(pb, MATROSKA_ID_CODECPRIVATE, codecpriv, codecpriv_size);
508
    av_free(codecpriv);
509
    return ret;
510 5c559894 David Conrad
}
511
512 5034ab90 David Conrad
static int mkv_write_tracks(AVFormatContext *s)
513 67143c0f David Conrad
{
514
    MatroskaMuxContext *mkv = s->priv_data;
515 899681cd Björn Axelsson
    ByteIOContext *pb = s->pb;
516 baf71dca David Conrad
    ebml_master tracks;
517 6d588ecd David Conrad
    int i, j, ret;
518 67143c0f David Conrad
519 6d588ecd David Conrad
    ret = mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_TRACKS, url_ftell(pb));
520
    if (ret < 0) return ret;
521 967d815a David Conrad
522 baf71dca David Conrad
    tracks = start_ebml_master(pb, MATROSKA_ID_TRACKS, 0);
523 67143c0f David Conrad
    for (i = 0; i < s->nb_streams; i++) {
524
        AVStream *st = s->streams[i];
525 f622c4f4 David Conrad
        AVCodecContext *codec = st->codec;
526 baf71dca David Conrad
        ebml_master subinfo, track;
527 f622c4f4 David Conrad
        int native_id = 0;
528 d22f88cb David Conrad
        int bit_depth = av_get_bits_per_sample(codec->codec_id);
529 07918a22 David Conrad
        int sample_rate = codec->sample_rate;
530
        int output_sample_rate = 0;
531
532 a6da1aa0 David Conrad
        if (!bit_depth)
533
            bit_depth = av_get_bits_per_sample_format(codec->sample_fmt);
534
535 07918a22 David Conrad
        if (codec->codec_id == CODEC_ID_AAC)
536 b62a33d0 David Conrad
            get_aac_sample_rates(s, codec, &sample_rate, &output_sample_rate);
537 f622c4f4 David Conrad
538 baf71dca David Conrad
        track = start_ebml_master(pb, MATROSKA_ID_TRACKENTRY, 0);
539 815eb6a2 David Conrad
        put_ebml_uint (pb, MATROSKA_ID_TRACKNUMBER     , i + 1);
540
        put_ebml_uint (pb, MATROSKA_ID_TRACKUID        , i + 1);
541 f622c4f4 David Conrad
        put_ebml_uint (pb, MATROSKA_ID_TRACKFLAGLACING , 0);    // no lacing (yet)
542
543
        if (st->language[0])
544
            put_ebml_string(pb, MATROSKA_ID_TRACKLANGUAGE, st->language);
545 fd150eb6 David Conrad
        else
546
            put_ebml_string(pb, MATROSKA_ID_TRACKLANGUAGE, "und");
547 f622c4f4 David Conrad
548 ab332d01 David Conrad
        // look for a codec ID string specific to mkv to use,
549 cfde5d18 David Conrad
        // if none are found, use AVI codes
550 f622c4f4 David Conrad
        for (j = 0; ff_mkv_codec_tags[j].id != CODEC_ID_NONE; j++) {
551
            if (ff_mkv_codec_tags[j].id == codec->codec_id) {
552
                put_ebml_string(pb, MATROSKA_ID_CODECID, ff_mkv_codec_tags[j].str);
553
                native_id = 1;
554
                break;
555
            }
556
        }
557
558
        switch (codec->codec_type) {
559
            case CODEC_TYPE_VIDEO:
560
                put_ebml_uint(pb, MATROSKA_ID_TRACKTYPE, MATROSKA_TRACK_TYPE_VIDEO);
561
562 c301d5ae David Conrad
                if (!native_id)
563 ab332d01 David Conrad
                    // if there is no mkv-specific codec ID, use VFW mode
564 f622c4f4 David Conrad
                    put_ebml_string(pb, MATROSKA_ID_CODECID, MATROSKA_CODEC_ID_VIDEO_VFW_FOURCC);
565 c301d5ae David Conrad
566 baf71dca David Conrad
                subinfo = start_ebml_master(pb, MATROSKA_ID_TRACKVIDEO, 0);
567 f622c4f4 David Conrad
                // XXX: interlace flag?
568
                put_ebml_uint (pb, MATROSKA_ID_VIDEOPIXELWIDTH , codec->width);
569
                put_ebml_uint (pb, MATROSKA_ID_VIDEOPIXELHEIGHT, codec->height);
570 7332addd David Conrad
                if (codec->sample_aspect_ratio.num) {
571 8ffc5f9e David Conrad
                    AVRational dar = av_mul_q(codec->sample_aspect_ratio,
572
                                    (AVRational){codec->width, codec->height});
573 8eb19153 David Conrad
                    put_ebml_uint(pb, MATROSKA_ID_VIDEODISPLAYWIDTH , dar.num);
574
                    put_ebml_uint(pb, MATROSKA_ID_VIDEODISPLAYHEIGHT, dar.den);
575 7332addd David Conrad
                }
576 f622c4f4 David Conrad
                end_ebml_master(pb, subinfo);
577
                break;
578
579
            case CODEC_TYPE_AUDIO:
580
                put_ebml_uint(pb, MATROSKA_ID_TRACKTYPE, MATROSKA_TRACK_TYPE_AUDIO);
581
582 c301d5ae David Conrad
                if (!native_id)
583 1a302a5c David Conrad
                    // no mkv-specific ID, use ACM mode
584
                    put_ebml_string(pb, MATROSKA_ID_CODECID, MATROSKA_CODEC_ID_AUDIO_ACM);
585 c301d5ae David Conrad
586 baf71dca David Conrad
                subinfo = start_ebml_master(pb, MATROSKA_ID_TRACKAUDIO, 0);
587 f622c4f4 David Conrad
                put_ebml_uint  (pb, MATROSKA_ID_AUDIOCHANNELS    , codec->channels);
588 07918a22 David Conrad
                put_ebml_float (pb, MATROSKA_ID_AUDIOSAMPLINGFREQ, sample_rate);
589
                if (output_sample_rate)
590
                    put_ebml_float(pb, MATROSKA_ID_AUDIOOUTSAMPLINGFREQ, output_sample_rate);
591 44008871 David Conrad
                if (bit_depth)
592
                    put_ebml_uint(pb, MATROSKA_ID_AUDIOBITDEPTH, bit_depth);
593 f622c4f4 David Conrad
                end_ebml_master(pb, subinfo);
594
                break;
595
596 47e08c58 David Conrad
            case CODEC_TYPE_SUBTITLE:
597
                put_ebml_uint(pb, MATROSKA_ID_TRACKTYPE, MATROSKA_TRACK_TYPE_SUBTITLE);
598
                break;
599 f622c4f4 David Conrad
            default:
600 3967eb52 David Conrad
                av_log(s, AV_LOG_ERROR, "Only audio, video, and subtitles are supported for Matroska.");
601 f622c4f4 David Conrad
                break;
602
        }
603 b62a33d0 David Conrad
        ret = mkv_write_codecprivate(s, pb, codec, native_id);
604 5c559894 David Conrad
        if (ret < 0) return ret;
605
606 67143c0f David Conrad
        end_ebml_master(pb, track);
607 f622c4f4 David Conrad
608
        // ms precision is the de-facto standard timescale for mkv files
609
        av_set_pts_info(st, 64, 1, 1000);
610 67143c0f David Conrad
    }
611
    end_ebml_master(pb, tracks);
612 801edb42 David Conrad
    return 0;
613 5034ab90 David Conrad
}
614
615
static int mkv_write_header(AVFormatContext *s)
616
{
617
    MatroskaMuxContext *mkv = s->priv_data;
618 899681cd Björn Axelsson
    ByteIOContext *pb = s->pb;
619 baf71dca David Conrad
    ebml_master ebml_header, segment_info;
620 6d588ecd David Conrad
    int ret;
621 5034ab90 David Conrad
622 541d443c David Conrad
    mkv->md5_ctx = av_mallocz(av_md5_size);
623
    av_md5_init(mkv->md5_ctx);
624
625 baf71dca David Conrad
    ebml_header = start_ebml_master(pb, EBML_ID_HEADER, 0);
626 5034ab90 David Conrad
    put_ebml_uint   (pb, EBML_ID_EBMLVERSION        ,           1);
627
    put_ebml_uint   (pb, EBML_ID_EBMLREADVERSION    ,           1);
628
    put_ebml_uint   (pb, EBML_ID_EBMLMAXIDLENGTH    ,           4);
629
    put_ebml_uint   (pb, EBML_ID_EBMLMAXSIZELENGTH  ,           8);
630
    put_ebml_string (pb, EBML_ID_DOCTYPE            ,  "matroska");
631
    put_ebml_uint   (pb, EBML_ID_DOCTYPEVERSION     ,           2);
632
    put_ebml_uint   (pb, EBML_ID_DOCTYPEREADVERSION ,           2);
633
    end_ebml_master(pb, ebml_header);
634
635 baf71dca David Conrad
    mkv->segment = start_ebml_master(pb, MATROSKA_ID_SEGMENT, 0);
636 967d815a David Conrad
    mkv->segment_offset = url_ftell(pb);
637
638 cfde5d18 David Conrad
    // we write 2 seek heads - one at the end of the file to point to each
639
    // cluster, and one at the beginning to point to all other level one
640
    // elements (including the seek head at the end of the file), which
641
    // isn't more than 10 elements if we only write one of each other
642
    // currently defined level 1 element
643 967d815a David Conrad
    mkv->main_seekhead    = mkv_start_seekhead(pb, mkv->segment_offset, 10);
644
    mkv->cluster_seekhead = mkv_start_seekhead(pb, mkv->segment_offset, 0);
645 c35de1a1 David Conrad
    if (mkv->main_seekhead == NULL || mkv->cluster_seekhead == NULL)
646
        return AVERROR(ENOMEM);
647 967d815a David Conrad
648 6d588ecd David Conrad
    ret = mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_INFO, url_ftell(pb));
649
    if (ret < 0) return ret;
650 5034ab90 David Conrad
651 baf71dca David Conrad
    segment_info = start_ebml_master(pb, MATROSKA_ID_INFO, 0);
652 5034ab90 David Conrad
    put_ebml_uint(pb, MATROSKA_ID_TIMECODESCALE, 1000000);
653
    if (strlen(s->title))
654
        put_ebml_string(pb, MATROSKA_ID_TITLE, s->title);
655
    if (!(s->streams[0]->codec->flags & CODEC_FLAG_BITEXACT)) {
656 5fd35c6e David Conrad
        put_ebml_string(pb, MATROSKA_ID_MUXINGAPP , LIBAVFORMAT_IDENT);
657 5034ab90 David Conrad
        put_ebml_string(pb, MATROSKA_ID_WRITINGAPP, LIBAVFORMAT_IDENT);
658 541d443c David Conrad
659
        // reserve space to write the segment UID later
660
        mkv->segment_uid = url_ftell(pb);
661
        put_ebml_void(pb, 19);
662 5034ab90 David Conrad
    }
663 4b8f58ee David Conrad
664 5034ab90 David Conrad
    // reserve space for the duration
665
    mkv->duration = 0;
666
    mkv->duration_offset = url_ftell(pb);
667
    put_ebml_void(pb, 11);                  // assumes double-precision float to be written
668
    end_ebml_master(pb, segment_info);
669
670 6d588ecd David Conrad
    ret = mkv_write_tracks(s);
671
    if (ret < 0) return ret;
672 67143c0f David Conrad
673 6d588ecd David Conrad
    ret = mkv_add_seekhead_entry(mkv->cluster_seekhead, MATROSKA_ID_CLUSTER, url_ftell(pb));
674
    if (ret < 0) return ret;
675 967d815a David Conrad
676 6364d534 David Conrad
    mkv->cluster_pos = url_ftell(pb);
677 baf71dca David Conrad
    mkv->cluster = start_ebml_master(pb, MATROSKA_ID_CLUSTER, 0);
678 b1adb69c David Conrad
    put_ebml_uint(pb, MATROSKA_ID_CLUSTERTIMECODE, 0);
679 98186e41 David Conrad
    mkv->cluster_pts = 0;
680 b1adb69c David Conrad
681 6364d534 David Conrad
    mkv->cues = mkv_start_cues(mkv->segment_offset);
682
    if (mkv->cues == NULL)
683 0b38843a David Conrad
        return AVERROR(ENOMEM);
684 6364d534 David Conrad
685 67143c0f David Conrad
    return 0;
686
}
687
688 baf71dca David Conrad
static int mkv_block_size(AVPacket *pkt)
689
{
690
    int size = 4;           // track num + timecode + flags
691
    return size + pkt->size;
692
}
693
694
static int mkv_blockgroup_size(AVPacket *pkt)
695
{
696
    int size = mkv_block_size(pkt);
697 0f651e8c David Conrad
    size += ebml_num_size(size);
698 baf71dca David Conrad
    size += 2;              // EBML ID for block and block duration
699
    size += 8;              // max size of block duration
700 0f651e8c David Conrad
    size += ebml_num_size(size);
701 baf71dca David Conrad
    size += 1;              // blockgroup EBML ID
702
    return size;
703
}
704
705 95527e06 David Conrad
static void mkv_write_block(AVFormatContext *s, unsigned int blockid, AVPacket *pkt, int flags)
706
{
707
    MatroskaMuxContext *mkv = s->priv_data;
708 899681cd Björn Axelsson
    ByteIOContext *pb = s->pb;
709 95527e06 David Conrad
710 8ffc5f9e David Conrad
    av_log(s, AV_LOG_DEBUG, "Writing block at offset %" PRIu64 ", size %d, "
711
           "pts %" PRId64 ", dts %" PRId64 ", duration %d, flags %d\n",
712 c1f5aa21 David Conrad
           url_ftell(pb), pkt->size, pkt->pts, pkt->dts, pkt->duration, flags);
713 95527e06 David Conrad
    put_ebml_id(pb, blockid);
714 0f651e8c David Conrad
    put_ebml_num(pb, mkv_block_size(pkt), 0);
715 95527e06 David Conrad
    put_byte(pb, 0x80 | (pkt->stream_index + 1));     // this assumes stream_index is less than 126
716
    put_be16(pb, pkt->pts - mkv->cluster_pts);
717
    put_byte(pb, flags);
718
    put_buffer(pb, pkt->data, pkt->size);
719
}
720
721 67143c0f David Conrad
static int mkv_write_packet(AVFormatContext *s, AVPacket *pkt)
722
{
723 98186e41 David Conrad
    MatroskaMuxContext *mkv = s->priv_data;
724 899681cd Björn Axelsson
    ByteIOContext *pb = s->pb;
725 9245c5ca David Conrad
    AVCodecContext *codec = s->streams[pkt->stream_index]->codec;
726 357eba6f David Conrad
    int keyframe = !!(pkt->flags & PKT_FLAG_KEY);
727 6d588ecd David Conrad
    int ret;
728 b1adb69c David Conrad
729 98186e41 David Conrad
    // start a new cluster every 5 MB or 5 sec
730 cce800b4 David Conrad
    if (url_ftell(pb) > mkv->cluster_pos + 5*1024*1024 || pkt->pts > mkv->cluster_pts + 5000) {
731 8ffc5f9e David Conrad
        av_log(s, AV_LOG_DEBUG, "Starting new cluster at offset %" PRIu64
732
               " bytes, pts %" PRIu64 "\n", url_ftell(pb), pkt->pts);
733 98186e41 David Conrad
        end_ebml_master(pb, mkv->cluster);
734 967d815a David Conrad
735 6d588ecd David Conrad
        ret = mkv_add_seekhead_entry(mkv->cluster_seekhead, MATROSKA_ID_CLUSTER, url_ftell(pb));
736
        if (ret < 0) return ret;
737 967d815a David Conrad
738 6364d534 David Conrad
        mkv->cluster_pos = url_ftell(pb);
739 baf71dca David Conrad
        mkv->cluster = start_ebml_master(pb, MATROSKA_ID_CLUSTER, 0);
740 98186e41 David Conrad
        put_ebml_uint(pb, MATROSKA_ID_CLUSTERTIMECODE, pkt->pts);
741
        mkv->cluster_pts = pkt->pts;
742 541d443c David Conrad
        av_md5_update(mkv->md5_ctx, pkt->data, FFMIN(200, pkt->size));
743 98186e41 David Conrad
    }
744
745 9245c5ca David Conrad
    if (codec->codec_type != CODEC_TYPE_SUBTITLE) {
746 56e4540d David Conrad
        mkv_write_block(s, MATROSKA_ID_SIMPLEBLOCK, pkt, keyframe << 7);
747 663a5d9d David Conrad
    } else {
748 baf71dca David Conrad
        ebml_master blockgroup = start_ebml_master(pb, MATROSKA_ID_BLOCKGROUP, mkv_blockgroup_size(pkt));
749 663a5d9d David Conrad
        mkv_write_block(s, MATROSKA_ID_BLOCK, pkt, 0);
750
        put_ebml_uint(pb, MATROSKA_ID_DURATION, pkt->duration);
751
        end_ebml_master(pb, blockgroup);
752
    }
753 02f487fc David Conrad
754 9245c5ca David Conrad
    if (codec->codec_type == CODEC_TYPE_VIDEO && keyframe) {
755 6d588ecd David Conrad
        ret = mkv_add_cuepoint(mkv->cues, pkt, mkv->cluster_pos);
756
        if (ret < 0) return ret;
757 6364d534 David Conrad
    }
758
759 7f8582df David Conrad
    mkv->duration = FFMAX(mkv->duration, pkt->pts + pkt->duration);
760 67143c0f David Conrad
    return 0;
761
}
762
763
static int mkv_write_trailer(AVFormatContext *s)
764
{
765
    MatroskaMuxContext *mkv = s->priv_data;
766 899681cd Björn Axelsson
    ByteIOContext *pb = s->pb;
767 6364d534 David Conrad
    offset_t currentpos, second_seekhead, cuespos;
768 9e2a3e22 David Conrad
    int ret;
769 02f487fc David Conrad
770 b1adb69c David Conrad
    end_ebml_master(pb, mkv->cluster);
771 02f487fc David Conrad
772 ac9e1177 David Conrad
    if (!url_is_streamed(pb)) {
773 e5c29287 David Conrad
        cuespos = mkv_write_cues(pb, mkv->cues, s->nb_streams);
774
        second_seekhead = mkv_write_seekhead(pb, mkv->cluster_seekhead);
775 6364d534 David Conrad
776 e5c29287 David Conrad
        ret = mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_CUES    , cuespos);
777
        if (ret < 0) return ret;
778
        ret = mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_SEEKHEAD, second_seekhead);
779
        if (ret < 0) return ret;
780
        mkv_write_seekhead(pb, mkv->main_seekhead);
781
782
        // update the duration
783
        av_log(s, AV_LOG_DEBUG, "end duration = %" PRIu64 "\n", mkv->duration);
784
        currentpos = url_ftell(pb);
785
        url_fseek(pb, mkv->duration_offset, SEEK_SET);
786
        put_ebml_float(pb, MATROSKA_ID_DURATION, mkv->duration);
787
788
        // write the md5sum of some frames as the segment UID
789
        if (!(s->streams[0]->codec->flags & CODEC_FLAG_BITEXACT)) {
790
            uint8_t segment_uid[16];
791
            av_md5_final(mkv->md5_ctx, segment_uid);
792
            url_fseek(pb, mkv->segment_uid, SEEK_SET);
793
            put_ebml_binary(pb, MATROSKA_ID_SEGMENTUID, segment_uid, 16);
794
        }
795
        url_fseek(pb, currentpos, SEEK_SET);
796 ac9e1177 David Conrad
    }
797 02f487fc David Conrad
798 67143c0f David Conrad
    end_ebml_master(pb, mkv->segment);
799 541d443c David Conrad
    av_free(mkv->md5_ctx);
800 67143c0f David Conrad
    return 0;
801
}
802
803
AVOutputFormat matroska_muxer = {
804
    "matroska",
805
    "Matroska File Format",
806
    "video/x-matroska",
807
    "mkv",
808
    sizeof(MatroskaMuxContext),
809
    CODEC_ID_MP2,
810
    CODEC_ID_MPEG4,
811
    mkv_write_header,
812
    mkv_write_packet,
813
    mkv_write_trailer,
814
    .codec_tag = (const AVCodecTag*[]){codec_bmp_tags, codec_wav_tags, 0},
815 c635497c David Conrad
    .subtitle_codec = CODEC_ID_TEXT,
816 67143c0f David Conrad
};
817 55c151ef David Conrad
818
AVOutputFormat matroska_audio_muxer = {
819
    "matroska",
820
    "Matroska File Format",
821
    "audio/x-matroska",
822
    "mka",
823
    sizeof(MatroskaMuxContext),
824
    CODEC_ID_MP2,
825
    CODEC_ID_NONE,
826
    mkv_write_header,
827
    mkv_write_packet,
828
    mkv_write_trailer,
829
    .codec_tag = (const AVCodecTag*[]){codec_wav_tags, 0},
830
};