/*
- * Matroska file muxer
+ * Matroska muxer
* Copyright (c) 2007 David Conrad
*
* This file is part of FFmpeg.
#include "avformat.h"
#include "riff.h"
-#include "xiph.h"
+#include "isom.h"
#include "matroska.h"
+#include "avc.h"
+#include "libavutil/md5.h"
+#include "libavcodec/xiph.h"
+#include "libavcodec/mpeg4audio.h"
+
+typedef struct ebml_master {
+ offset_t pos; ///< absolute offset in the file where the master's elements start
+ int sizebytes; ///< how many bytes were reserved for the size
+} ebml_master;
+
+typedef struct mkv_seekhead_entry {
+ unsigned int elementid;
+ uint64_t segmentpos;
+} mkv_seekhead_entry;
+
+typedef struct mkv_seekhead {
+ offset_t filepos;
+ offset_t segment_offset; ///< the file offset to the beginning of the segment
+ int reserved_size; ///< -1 if appending to file
+ int max_entries;
+ mkv_seekhead_entry *entries;
+ int num_entries;
+} mkv_seekhead;
+
+typedef struct {
+ uint64_t pts;
+ int tracknum;
+ offset_t cluster_pos; ///< file offset of the cluster containing the block
+} mkv_cuepoint;
+
+typedef struct {
+ offset_t segment_offset;
+ mkv_cuepoint *entries;
+ int num_entries;
+} mkv_cues;
typedef struct MatroskaMuxContext {
- offset_t segment;
- offset_t cluster;
- uint64_t cluster_pts;
+ ebml_master segment;
+ offset_t segment_offset;
+ offset_t segment_uid;
+ ebml_master cluster;
+ offset_t cluster_pos; ///< file offset of the current cluster
+ uint64_t cluster_pts;
+ offset_t duration_offset;
+ uint64_t duration;
+ mkv_seekhead *main_seekhead;
+ mkv_seekhead *cluster_seekhead;
+ mkv_cues *cues;
+
+ struct AVMD5 *md5_ctx;
} MatroskaMuxContext;
+
+/** 2 bytes * 3 for EBML IDs, 3 1-byte EBML lengths, 8 bytes for 64 bit
+ * offset, 4 bytes for target EBML ID */
+#define MAX_SEEKENTRY_SIZE 21
+
+/** per-cuepoint-track - 3 1-byte EBML IDs, 3 1-byte EBML sizes, 2
+ * 8-byte uint max */
+#define MAX_CUETRACKPOS_SIZE 22
+
+/** per-cuepoint - 2 1-byte EBML IDs, 2 1-byte EBML sizes, 8-byte uint max */
+#define MAX_CUEPOINT_SIZE(num_tracks) 12 + MAX_CUETRACKPOS_SIZE*num_tracks
+
+
+static int ebml_id_size(unsigned int id)
+{
+ return (av_log2(id+1)-1)/7+1;
+}
+
static void put_ebml_id(ByteIOContext *pb, unsigned int id)
{
- if (id >= 0x3fffff)
- put_byte(pb, id >> 24);
- if (id >= 0x7fff)
- put_byte(pb, id >> 16);
- if (id >= 0xff)
- put_byte(pb, id >> 8);
- put_byte(pb, id);
+ int i = ebml_id_size(id);
+ while (i--)
+ put_byte(pb, id >> (i*8));
}
-// XXX: test this thoroughly and get rid of minbytes hack (currently needed to
-// use up all of the space reserved in start_ebml_master)
-static void put_ebml_size(ByteIOContext *pb, uint64_t size, int minbytes)
+/**
+ * Write an EBML size meaning "unknown size".
+ *
+ * @param bytes The number of bytes the size should occupy (maximum: 8).
+ */
+static void put_ebml_size_unknown(ByteIOContext *pb, int bytes)
{
- int bytes = minbytes;
+ assert(bytes <= 8);
+ put_byte(pb, 0x1ff >> bytes);
+ while (--bytes)
+ put_byte(pb, 0xff);
+}
- // sizes larger than this are currently undefined in EBML
- // so write "unknown" size
- size = FFMIN(size, (1ULL<<56)-1);
+/**
+ * Calculate how many bytes are needed to represent a given number in EBML.
+ */
+static int ebml_num_size(uint64_t num)
+{
+ int bytes = 1;
+ while ((num+1) >> bytes*7) bytes++;
+ return bytes;
+}
- while (size >> (bytes*7 + 7)) bytes++;
+/**
+ * Write a number in EBML variable length format.
+ *
+ * @param bytes The number of bytes that need to be used to write the number.
+ * If zero, any number of bytes can be used.
+ */
+static void put_ebml_num(ByteIOContext *pb, uint64_t num, int bytes)
+{
+ int i, needed_bytes = ebml_num_size(num);
- put_byte(pb, (0x80 >> bytes) | (size >> bytes*8));
- for (bytes -= 1; bytes >= 0; bytes--)
- put_byte(pb, size >> bytes*8);
+ // sizes larger than this are currently undefined in EBML
+ assert(num < (1ULL<<56)-1);
+
+ if (bytes == 0)
+ // don't care how many bytes are used, so use the min
+ bytes = needed_bytes;
+ // the bytes needed to write the given size would exceed the bytes
+ // that we need to use, so write unknown size. This shouldn't happen.
+ assert(bytes >= needed_bytes);
+
+ num |= 1ULL << bytes*7;
+ for (i = bytes - 1; i >= 0; i--)
+ put_byte(pb, num >> i*8);
}
static void put_ebml_uint(ByteIOContext *pb, unsigned int elementid, uint64_t val)
{
- int bytes = 1;
- while (val >> bytes*8) bytes++;
+ int i, bytes = 1;
+ uint64_t tmp = val;
+ while (tmp>>=8) bytes++;
put_ebml_id(pb, elementid);
- put_ebml_size(pb, bytes, 0);
- for (bytes -= 1; bytes >= 0; bytes--)
- put_byte(pb, val >> bytes*8);
+ put_ebml_num(pb, bytes, 0);
+ for (i = bytes - 1; i >= 0; i--)
+ put_byte(pb, val >> i*8);
}
-//static void put_ebml_sint(ByteIOContext *pb, unsigned int elementid, int64_t val)
-
static void put_ebml_float(ByteIOContext *pb, unsigned int elementid, double val)
{
- // XXX: single-precision floats?
put_ebml_id(pb, elementid);
- put_ebml_size(pb, 8, 0);
+ put_ebml_num(pb, 8, 0);
put_be64(pb, av_dbl2int(val));
}
const uint8_t *buf, int size)
{
put_ebml_id(pb, elementid);
- put_ebml_size(pb, size, 0);
+ put_ebml_num(pb, size, 0);
put_buffer(pb, buf, size);
}
put_ebml_binary(pb, elementid, str, strlen(str));
}
-static offset_t start_ebml_master(ByteIOContext *pb, unsigned int elementid)
+/**
+ * Writes a void element of a given size. Useful for reserving space in
+ * the file to be written to later.
+ *
+ * @param size The number of bytes to reserve, which must be at least 2.
+ */
+static void put_ebml_void(ByteIOContext *pb, uint64_t size)
+{
+ offset_t currentpos = url_ftell(pb);
+
+ assert(size >= 2);
+
+ put_ebml_id(pb, EBML_ID_VOID);
+ // we need to subtract the length needed to store the size from the
+ // size we need to reserve so 2 cases, we use 8 bytes to store the
+ // size if possible, 1 byte otherwise
+ if (size < 10)
+ put_ebml_num(pb, size-1, 0);
+ else
+ put_ebml_num(pb, size-9, 8);
+ while(url_ftell(pb) < currentpos + size)
+ put_byte(pb, 0);
+}
+
+static ebml_master start_ebml_master(ByteIOContext *pb, unsigned int elementid, uint64_t expectedsize)
{
+ int bytes = expectedsize ? ebml_num_size(expectedsize) : 8;
put_ebml_id(pb, elementid);
- // XXX: this always reserves the maximum needed space to store any size value
- // we should be smarter (additional parameter for expected size?)
- put_ebml_size(pb, (1ULL<<56)-1, 0); // largest unknown size
- return url_ftell(pb);
+ put_ebml_size_unknown(pb, bytes);
+ return (ebml_master){ url_ftell(pb), bytes };
}
-static void end_ebml_master(ByteIOContext *pb, offset_t start)
+static void end_ebml_master(ByteIOContext *pb, ebml_master master)
{
offset_t pos = url_ftell(pb);
- url_fseek(pb, start - 8, SEEK_SET);
- put_ebml_size(pb, pos - start, 7);
+ // leave the unknown size for masters when streaming
+ if (url_is_streamed(pb))
+ return;
+
+ url_fseek(pb, master.pos - master.sizebytes, SEEK_SET);
+ put_ebml_num(pb, pos - master.pos, master.sizebytes);
url_fseek(pb, pos, SEEK_SET);
}
+static void put_xiph_size(ByteIOContext *pb, int size)
+{
+ int i;
+ for (i = 0; i < size / 255; i++)
+ put_byte(pb, 255);
+ put_byte(pb, size % 255);
+}
-static int mkv_write_header(AVFormatContext *s)
+/**
+ * Initialize a mkv_seekhead element to be ready to index level 1 Matroska
+ * elements. If a maximum number of elements is specified, enough space
+ * will be reserved at the current file location to write a seek head of
+ * that size.
+ *
+ * @param segment_offset The absolute offset to the position in the file
+ * where the segment begins.
+ * @param numelements The maximum number of elements that will be indexed
+ * by this seek head, 0 if unlimited.
+ */
+static mkv_seekhead * mkv_start_seekhead(ByteIOContext *pb, offset_t segment_offset, int numelements)
{
- MatroskaMuxContext *mkv = s->priv_data;
- ByteIOContext *pb = &s->pb;
- offset_t ebml_header, segment_info, tracks;
- int i, j, k;
+ mkv_seekhead *new_seekhead = av_mallocz(sizeof(mkv_seekhead));
+ if (new_seekhead == NULL)
+ return NULL;
+
+ new_seekhead->segment_offset = segment_offset;
+
+ if (numelements > 0) {
+ new_seekhead->filepos = url_ftell(pb);
+ // 21 bytes max for a seek entry, 10 bytes max for the SeekHead ID
+ // and size, and 3 bytes to guarantee that an EBML void element
+ // will fit afterwards
+ new_seekhead->reserved_size = numelements * MAX_SEEKENTRY_SIZE + 13;
+ new_seekhead->max_entries = numelements;
+ put_ebml_void(pb, new_seekhead->reserved_size);
+ }
+ return new_seekhead;
+}
- ebml_header = start_ebml_master(pb, EBML_ID_HEADER);
- put_ebml_uint (pb, EBML_ID_EBMLVERSION , 1);
- put_ebml_uint (pb, EBML_ID_EBMLREADVERSION , 1);
- put_ebml_uint (pb, EBML_ID_EBMLMAXIDLENGTH , 4);
- put_ebml_uint (pb, EBML_ID_EBMLMAXSIZELENGTH , 8);
- put_ebml_string (pb, EBML_ID_DOCTYPE , "matroska");
- put_ebml_uint (pb, EBML_ID_DOCTYPEVERSION , 2);
- put_ebml_uint (pb, EBML_ID_DOCTYPEREADVERSION , 2);
- end_ebml_master(pb, ebml_header);
+static int mkv_add_seekhead_entry(mkv_seekhead *seekhead, unsigned int elementid, uint64_t filepos)
+{
+ mkv_seekhead_entry *entries = seekhead->entries;
- mkv->segment = start_ebml_master(pb, MATROSKA_ID_SEGMENT);
+ // don't store more elements than we reserved space for
+ if (seekhead->max_entries > 0 && seekhead->max_entries <= seekhead->num_entries)
+ return -1;
- segment_info = start_ebml_master(pb, MATROSKA_ID_INFO);
- put_ebml_uint(pb, MATROSKA_ID_TIMECODESCALE, 1000000);
- if (strlen(s->title))
- put_ebml_string(pb, MATROSKA_ID_TITLE, s->title);
- if (!(s->streams[0]->codec->flags & CODEC_FLAG_BITEXACT)) {
- put_ebml_string(pb, MATROSKA_ID_MUXINGAPP, LIBAVFORMAT_IDENT);
- // XXX: both are required; something better for writing app?
- put_ebml_string(pb, MATROSKA_ID_WRITINGAPP, LIBAVFORMAT_IDENT);
+ entries = av_realloc(entries, (seekhead->num_entries + 1) * sizeof(mkv_seekhead_entry));
+ if (entries == NULL)
+ return AVERROR(ENOMEM);
+
+ entries[seekhead->num_entries ].elementid = elementid;
+ entries[seekhead->num_entries++].segmentpos = filepos - seekhead->segment_offset;
+
+ seekhead->entries = entries;
+ return 0;
+}
+
+/**
+ * Write the seek head to the file and free it. If a maximum number of
+ * elements was specified to mkv_start_seekhead(), the seek head will
+ * be written at the location reserved for it. Otherwise, it is written
+ * at the current location in the file.
+ *
+ * @return The file offset where the seekhead was written.
+ */
+static offset_t mkv_write_seekhead(ByteIOContext *pb, mkv_seekhead *seekhead)
+{
+ ebml_master metaseek, seekentry;
+ offset_t currentpos;
+ int i;
+
+ currentpos = url_ftell(pb);
+
+ if (seekhead->reserved_size > 0)
+ url_fseek(pb, seekhead->filepos, SEEK_SET);
+
+ metaseek = start_ebml_master(pb, MATROSKA_ID_SEEKHEAD, seekhead->reserved_size);
+ for (i = 0; i < seekhead->num_entries; i++) {
+ mkv_seekhead_entry *entry = &seekhead->entries[i];
+
+ seekentry = start_ebml_master(pb, MATROSKA_ID_SEEKENTRY, MAX_SEEKENTRY_SIZE);
+
+ put_ebml_id(pb, MATROSKA_ID_SEEKID);
+ put_ebml_num(pb, ebml_id_size(entry->elementid), 0);
+ put_ebml_id(pb, entry->elementid);
+
+ put_ebml_uint(pb, MATROSKA_ID_SEEKPOSITION, entry->segmentpos);
+ end_ebml_master(pb, seekentry);
}
- // XXX: segment UID and duration
- end_ebml_master(pb, segment_info);
+ end_ebml_master(pb, metaseek);
+
+ if (seekhead->reserved_size > 0) {
+ uint64_t remaining = seekhead->filepos + seekhead->reserved_size - url_ftell(pb);
+ put_ebml_void(pb, remaining);
+ url_fseek(pb, currentpos, SEEK_SET);
+
+ currentpos = seekhead->filepos;
+ }
+ av_free(seekhead->entries);
+ av_free(seekhead);
+
+ return currentpos;
+}
+
+static mkv_cues * mkv_start_cues(offset_t segment_offset)
+{
+ mkv_cues *cues = av_mallocz(sizeof(mkv_cues));
+ if (cues == NULL)
+ return NULL;
+
+ cues->segment_offset = segment_offset;
+ return cues;
+}
+
+static int mkv_add_cuepoint(mkv_cues *cues, AVPacket *pkt, offset_t cluster_pos)
+{
+ mkv_cuepoint *entries = cues->entries;
+
+ entries = av_realloc(entries, (cues->num_entries + 1) * sizeof(mkv_cuepoint));
+ if (entries == NULL)
+ return AVERROR(ENOMEM);
+
+ entries[cues->num_entries ].pts = pkt->pts;
+ entries[cues->num_entries ].tracknum = pkt->stream_index + 1;
+ entries[cues->num_entries++].cluster_pos = cluster_pos - cues->segment_offset;
+
+ cues->entries = entries;
+ return 0;
+}
+
+static offset_t mkv_write_cues(ByteIOContext *pb, mkv_cues *cues, int num_tracks)
+{
+ ebml_master cues_element;
+ offset_t currentpos;
+ int i, j;
+
+ currentpos = url_ftell(pb);
+ cues_element = start_ebml_master(pb, MATROSKA_ID_CUES, 0);
+
+ for (i = 0; i < cues->num_entries; i++) {
+ ebml_master cuepoint, track_positions;
+ mkv_cuepoint *entry = &cues->entries[i];
+ uint64_t pts = entry->pts;
+
+ cuepoint = start_ebml_master(pb, MATROSKA_ID_POINTENTRY, MAX_CUEPOINT_SIZE(num_tracks));
+ put_ebml_uint(pb, MATROSKA_ID_CUETIME, pts);
+
+ // put all the entries from different tracks that have the exact same
+ // timestamp into the same CuePoint
+ for (j = 0; j < cues->num_entries - i && entry[j].pts == pts; j++) {
+ track_positions = start_ebml_master(pb, MATROSKA_ID_CUETRACKPOSITION, MAX_CUETRACKPOS_SIZE);
+ put_ebml_uint(pb, MATROSKA_ID_CUETRACK , entry[j].tracknum );
+ put_ebml_uint(pb, MATROSKA_ID_CUECLUSTERPOSITION, entry[j].cluster_pos);
+ end_ebml_master(pb, track_positions);
+ }
+ i += j - 1;
+ end_ebml_master(pb, cuepoint);
+ }
+ end_ebml_master(pb, cues_element);
+
+ av_free(cues->entries);
+ av_free(cues);
+ return currentpos;
+}
+
+static int put_xiph_codecpriv(AVFormatContext *s, ByteIOContext *pb, AVCodecContext *codec)
+{
+ uint8_t *header_start[3];
+ int header_len[3];
+ int first_header_size;
+ int j;
+
+ if (codec->codec_id == CODEC_ID_VORBIS)
+ first_header_size = 30;
+ else
+ first_header_size = 42;
+
+ if (ff_split_xiph_headers(codec->extradata, codec->extradata_size,
+ first_header_size, header_start, header_len) < 0) {
+ av_log(s, AV_LOG_ERROR, "Extradata corrupt.\n");
+ return -1;
+ }
+
+ put_byte(pb, 2); // number packets - 1
+ for (j = 0; j < 2; j++) {
+ put_xiph_size(pb, header_len[j]);
+ }
+ for (j = 0; j < 3; j++)
+ put_buffer(pb, header_start[j], header_len[j]);
+
+ return 0;
+}
+
+#define FLAC_STREAMINFO_SIZE 34
+
+static int put_flac_codecpriv(AVFormatContext *s, ByteIOContext *pb, AVCodecContext *codec)
+{
+ // if the extradata_size is greater than FLAC_STREAMINFO_SIZE,
+ // assume that it's in Matroska format already
+ if (codec->extradata_size < FLAC_STREAMINFO_SIZE) {
+ av_log(s, AV_LOG_ERROR, "Invalid FLAC extradata\n");
+ return -1;
+ } else if (codec->extradata_size == FLAC_STREAMINFO_SIZE) {
+ // only the streaminfo packet
+ put_buffer(pb, "fLaC", 4);
+ put_byte(pb, 0x80);
+ put_be24(pb, FLAC_STREAMINFO_SIZE);
+ } else if(memcmp("fLaC", codec->extradata, 4)) {
+ av_log(s, AV_LOG_ERROR, "Invalid FLAC extradata\n");
+ return -1;
+ }
+ put_buffer(pb, codec->extradata, codec->extradata_size);
+ return 0;
+}
+
+static void get_aac_sample_rates(AVFormatContext *s, AVCodecContext *codec, int *sample_rate, int *output_sample_rate)
+{
+ int sri;
+
+ if (codec->extradata_size < 2) {
+ av_log(s, AV_LOG_WARNING, "No AAC extradata, unable to determine samplerate.\n");
+ return;
+ }
+
+ sri = ((codec->extradata[0] << 1) & 0xE) | (codec->extradata[1] >> 7);
+ if (sri > 12) {
+ av_log(s, AV_LOG_WARNING, "AAC samplerate index out of bounds\n");
+ return;
+ }
+ *sample_rate = ff_mpeg4audio_sample_rates[sri];
+
+ // if sbr, get output sample rate as well
+ if (codec->extradata_size == 5) {
+ sri = (codec->extradata[4] >> 3) & 0xF;
+ if (sri > 12) {
+ av_log(s, AV_LOG_WARNING, "AAC output samplerate index out of bounds\n");
+ return;
+ }
+ *output_sample_rate = ff_mpeg4audio_sample_rates[sri];
+ }
+}
+
+static int mkv_write_codecprivate(AVFormatContext *s, ByteIOContext *pb, AVCodecContext *codec, int native_id, int qt_id)
+{
+ ByteIOContext *dyn_cp;
+ uint8_t *codecpriv;
+ int ret, codecpriv_size;
+
+ ret = url_open_dyn_buf(&dyn_cp);
+ if(ret < 0)
+ return ret;
+
+ if (native_id) {
+ if (codec->codec_id == CODEC_ID_VORBIS || codec->codec_id == CODEC_ID_THEORA)
+ ret = put_xiph_codecpriv(s, dyn_cp, codec);
+ else if (codec->codec_id == CODEC_ID_FLAC)
+ ret = put_flac_codecpriv(s, dyn_cp, codec);
+ else if (codec->codec_id == CODEC_ID_H264)
+ ret = ff_isom_write_avcc(dyn_cp, codec->extradata, codec->extradata_size);
+ else if (codec->extradata_size)
+ put_buffer(dyn_cp, codec->extradata, codec->extradata_size);
+ } else if (codec->codec_type == CODEC_TYPE_VIDEO) {
+ if (qt_id) {
+ if (!codec->codec_tag)
+ codec->codec_tag = codec_get_tag(codec_movvideo_tags, codec->codec_id);
+ if (codec->extradata_size)
+ put_buffer(dyn_cp, codec->extradata, codec->extradata_size);
+ } else {
+ if (!codec->codec_tag)
+ codec->codec_tag = codec_get_tag(codec_bmp_tags, codec->codec_id);
+ if (!codec->codec_tag) {
+ av_log(s, AV_LOG_ERROR, "No bmp codec ID found.");
+ ret = -1;
+ }
- tracks = start_ebml_master(pb, MATROSKA_ID_TRACKS);
+ put_bmp_header(dyn_cp, codec, codec_bmp_tags, 0);
+ }
+
+ } else if (codec->codec_type == CODEC_TYPE_AUDIO) {
+ if (!codec->codec_tag)
+ codec->codec_tag = codec_get_tag(codec_wav_tags, codec->codec_id);
+ if (!codec->codec_tag) {
+ av_log(s, AV_LOG_ERROR, "No wav codec ID found.");
+ ret = -1;
+ }
+
+ put_wav_header(dyn_cp, codec);
+ }
+
+ codecpriv_size = url_close_dyn_buf(dyn_cp, &codecpriv);
+ if (codecpriv_size)
+ put_ebml_binary(pb, MATROSKA_ID_CODECPRIVATE, codecpriv, codecpriv_size);
+ av_free(codecpriv);
+ return ret;
+}
+
+static int mkv_write_tracks(AVFormatContext *s)
+{
+ MatroskaMuxContext *mkv = s->priv_data;
+ ByteIOContext *pb = s->pb;
+ ebml_master tracks;
+ int i, j, ret;
+
+ ret = mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_TRACKS, url_ftell(pb));
+ if (ret < 0) return ret;
+
+ tracks = start_ebml_master(pb, MATROSKA_ID_TRACKS, 0);
for (i = 0; i < s->nb_streams; i++) {
AVStream *st = s->streams[i];
AVCodecContext *codec = st->codec;
- offset_t subinfo, track;
+ ebml_master subinfo, track;
int native_id = 0;
+ int qt_id = 0;
+ int bit_depth = av_get_bits_per_sample(codec->codec_id);
+ int sample_rate = codec->sample_rate;
+ int output_sample_rate = 0;
+
+ if (!bit_depth)
+ bit_depth = av_get_bits_per_sample_format(codec->sample_fmt);
+
+ if (codec->codec_id == CODEC_ID_AAC)
+ get_aac_sample_rates(s, codec, &sample_rate, &output_sample_rate);
- track = start_ebml_master(pb, MATROSKA_ID_TRACKENTRY);
+ track = start_ebml_master(pb, MATROSKA_ID_TRACKENTRY, 0);
put_ebml_uint (pb, MATROSKA_ID_TRACKNUMBER , i + 1);
put_ebml_uint (pb, MATROSKA_ID_TRACKUID , i + 1);
put_ebml_uint (pb, MATROSKA_ID_TRACKFLAGLACING , 0); // no lacing (yet)
if (st->language[0])
put_ebml_string(pb, MATROSKA_ID_TRACKLANGUAGE, st->language);
+ else
+ put_ebml_string(pb, MATROSKA_ID_TRACKLANGUAGE, "und");
- // look for a codec id string specific to mkv to use, if none are found, use AVI codes
+ put_ebml_uint(pb, MATROSKA_ID_TRACKFLAGDEFAULT, !!(st->disposition & AV_DISPOSITION_DEFAULT));
+
+ // look for a codec ID string specific to mkv to use,
+ // if none are found, use AVI codes
for (j = 0; ff_mkv_codec_tags[j].id != CODEC_ID_NONE; j++) {
if (ff_mkv_codec_tags[j].id == codec->codec_id) {
put_ebml_string(pb, MATROSKA_ID_CODECID, ff_mkv_codec_tags[j].str);
}
}
- // XXX: CodecPrivate for vorbis, theora, aac, native mpeg4, ...
- if (native_id) {
- offset_t codecprivate;
-
- if (codec->codec_id == CODEC_ID_VORBIS || codec->codec_id == CODEC_ID_THEORA) {
- uint8_t *header_start[3];
- int header_len[3];
- int first_header_size;
-
- if (codec->codec_id == CODEC_ID_VORBIS)
- first_header_size = 30;
- else
- first_header_size = 42;
-
- if (ff_split_xiph_headers(codec->extradata, codec->extradata_size,
- first_header_size, header_start, header_len) < 0) {
- av_log(s, AV_LOG_ERROR, "Extradata corrupt.\n");
- return -1;
- }
-
- codecprivate = start_ebml_master(pb, MATROSKA_ID_CODECPRIVATE);
- put_byte(pb, 2); // number packets - 1
- for (j = 0; j < 2; j++) {
- for (k = 0; k < header_len[j] / 255; k++)
- put_byte(pb, 255);
- put_byte(pb, header_len[j] % 255);
- }
- for (j = 0; j < 3; j++)
- put_buffer(pb, header_start[j], header_len[j]);
- end_ebml_master(pb, codecprivate);
- } else {
- put_ebml_binary(pb, MATROSKA_ID_CODECPRIVATE, codec->extradata, codec->extradata_size);
- }
- }
-
switch (codec->codec_type) {
case CODEC_TYPE_VIDEO:
put_ebml_uint(pb, MATROSKA_ID_TRACKTYPE, MATROSKA_TRACK_TYPE_VIDEO);
- if (!native_id) {
- offset_t bmp_header;
- // if there is no mkv-specific codec id, use VFW mode
- if (!codec->codec_tag)
- codec->codec_tag = codec_get_tag(codec_bmp_tags, codec->codec_id);
-
- put_ebml_string(pb, MATROSKA_ID_CODECID, MATROSKA_CODEC_ID_VIDEO_VFW_FOURCC);
- // XXX: codec private isn't a master; is there a better way to re-use put_bmp_header?
- bmp_header = start_ebml_master(pb, MATROSKA_ID_CODECPRIVATE);
- put_bmp_header(pb, codec, codec_bmp_tags, 0);
- end_ebml_master(pb, bmp_header);
- }
- subinfo = start_ebml_master(pb, MATROSKA_ID_TRACKVIDEO);
+ if (!native_id &&
+ codec_get_tag(codec_movvideo_tags, codec->codec_id) &&
+ (!codec_get_tag(codec_bmp_tags, codec->codec_id)
+ || codec->codec_id == CODEC_ID_SVQ1
+ || codec->codec_id == CODEC_ID_SVQ3
+ || codec->codec_id == CODEC_ID_CINEPAK))
+ qt_id = 1;
+
+ if (qt_id)
+ put_ebml_string(pb, MATROSKA_ID_CODECID, "V_QUICKTIME");
+ else if (!native_id)
+ // if there is no mkv-specific codec ID, use VFW mode
+ put_ebml_string(pb, MATROSKA_ID_CODECID, "V_MS/VFW/FOURCC");
+
+ subinfo = start_ebml_master(pb, MATROSKA_ID_TRACKVIDEO, 0);
// XXX: interlace flag?
put_ebml_uint (pb, MATROSKA_ID_VIDEOPIXELWIDTH , codec->width);
put_ebml_uint (pb, MATROSKA_ID_VIDEOPIXELHEIGHT, codec->height);
- // XXX: display width/height
+ if (st->sample_aspect_ratio.num) {
+ int d_width = codec->width*av_q2d(st->sample_aspect_ratio);
+ put_ebml_uint(pb, MATROSKA_ID_VIDEODISPLAYWIDTH , d_width);
+ put_ebml_uint(pb, MATROSKA_ID_VIDEODISPLAYHEIGHT, codec->height);
+ }
end_ebml_master(pb, subinfo);
break;
case CODEC_TYPE_AUDIO:
put_ebml_uint(pb, MATROSKA_ID_TRACKTYPE, MATROSKA_TRACK_TYPE_AUDIO);
- // XXX: A_MS/ACM
- subinfo = start_ebml_master(pb, MATROSKA_ID_TRACKAUDIO);
+ if (!native_id)
+ // no mkv-specific ID, use ACM mode
+ put_ebml_string(pb, MATROSKA_ID_CODECID, "A_MS/ACM");
+
+ subinfo = start_ebml_master(pb, MATROSKA_ID_TRACKAUDIO, 0);
put_ebml_uint (pb, MATROSKA_ID_AUDIOCHANNELS , codec->channels);
- put_ebml_float (pb, MATROSKA_ID_AUDIOSAMPLINGFREQ, codec->sample_rate);
- // XXX: output sample freq (for sbr) and bitdepth (for pcm)
+ put_ebml_float (pb, MATROSKA_ID_AUDIOSAMPLINGFREQ, sample_rate);
+ if (output_sample_rate)
+ put_ebml_float(pb, MATROSKA_ID_AUDIOOUTSAMPLINGFREQ, output_sample_rate);
+ if (bit_depth)
+ put_ebml_uint(pb, MATROSKA_ID_AUDIOBITDEPTH, bit_depth);
end_ebml_master(pb, subinfo);
break;
+ case CODEC_TYPE_SUBTITLE:
+ put_ebml_uint(pb, MATROSKA_ID_TRACKTYPE, MATROSKA_TRACK_TYPE_SUBTITLE);
+ break;
default:
- av_log(s, AV_LOG_ERROR, "Only audio and video are supported for Matroska.");
+ av_log(s, AV_LOG_ERROR, "Only audio, video, and subtitles are supported for Matroska.");
break;
}
+ ret = mkv_write_codecprivate(s, pb, codec, native_id, qt_id);
+ if (ret < 0) return ret;
+
end_ebml_master(pb, track);
// ms precision is the de-facto standard timescale for mkv files
av_set_pts_info(st, 64, 1, 1000);
}
end_ebml_master(pb, tracks);
+ return 0;
+}
+
+static int mkv_write_header(AVFormatContext *s)
+{
+ MatroskaMuxContext *mkv = s->priv_data;
+ ByteIOContext *pb = s->pb;
+ ebml_master ebml_header, segment_info;
+ int ret;
+
+ mkv->md5_ctx = av_mallocz(av_md5_size);
+ av_md5_init(mkv->md5_ctx);
+
+ ebml_header = start_ebml_master(pb, EBML_ID_HEADER, 0);
+ put_ebml_uint (pb, EBML_ID_EBMLVERSION , 1);
+ put_ebml_uint (pb, EBML_ID_EBMLREADVERSION , 1);
+ put_ebml_uint (pb, EBML_ID_EBMLMAXIDLENGTH , 4);
+ put_ebml_uint (pb, EBML_ID_EBMLMAXSIZELENGTH , 8);
+ put_ebml_string (pb, EBML_ID_DOCTYPE , "matroska");
+ put_ebml_uint (pb, EBML_ID_DOCTYPEVERSION , 2);
+ put_ebml_uint (pb, EBML_ID_DOCTYPEREADVERSION , 2);
+ end_ebml_master(pb, ebml_header);
+
+ mkv->segment = start_ebml_master(pb, MATROSKA_ID_SEGMENT, 0);
+ mkv->segment_offset = url_ftell(pb);
- mkv->cluster = start_ebml_master(pb, MATROSKA_ID_CLUSTER);
+ // we write 2 seek heads - one at the end of the file to point to each
+ // cluster, and one at the beginning to point to all other level one
+ // elements (including the seek head at the end of the file), which
+ // isn't more than 10 elements if we only write one of each other
+ // currently defined level 1 element
+ mkv->main_seekhead = mkv_start_seekhead(pb, mkv->segment_offset, 10);
+ mkv->cluster_seekhead = mkv_start_seekhead(pb, mkv->segment_offset, 0);
+ if (mkv->main_seekhead == NULL || mkv->cluster_seekhead == NULL)
+ return AVERROR(ENOMEM);
+
+ ret = mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_INFO, url_ftell(pb));
+ if (ret < 0) return ret;
+
+ segment_info = start_ebml_master(pb, MATROSKA_ID_INFO, 0);
+ put_ebml_uint(pb, MATROSKA_ID_TIMECODESCALE, 1000000);
+ if (strlen(s->title))
+ put_ebml_string(pb, MATROSKA_ID_TITLE, s->title);
+ if (!(s->streams[0]->codec->flags & CODEC_FLAG_BITEXACT)) {
+ put_ebml_string(pb, MATROSKA_ID_MUXINGAPP , LIBAVFORMAT_IDENT);
+ put_ebml_string(pb, MATROSKA_ID_WRITINGAPP, LIBAVFORMAT_IDENT);
+
+ // reserve space to write the segment UID later
+ mkv->segment_uid = url_ftell(pb);
+ put_ebml_void(pb, 19);
+ }
+
+ // reserve space for the duration
+ mkv->duration = 0;
+ mkv->duration_offset = url_ftell(pb);
+ put_ebml_void(pb, 11); // assumes double-precision float to be written
+ end_ebml_master(pb, segment_info);
+
+ ret = mkv_write_tracks(s);
+ if (ret < 0) return ret;
+
+ ret = mkv_add_seekhead_entry(mkv->cluster_seekhead, MATROSKA_ID_CLUSTER, url_ftell(pb));
+ if (ret < 0) return ret;
+
+ mkv->cluster_pos = url_ftell(pb);
+ mkv->cluster = start_ebml_master(pb, MATROSKA_ID_CLUSTER, 0);
put_ebml_uint(pb, MATROSKA_ID_CLUSTERTIMECODE, 0);
mkv->cluster_pts = 0;
+ mkv->cues = mkv_start_cues(mkv->segment_offset);
+ if (mkv->cues == NULL)
+ return AVERROR(ENOMEM);
+
return 0;
}
+static int mkv_block_size(AVPacket *pkt)
+{
+ int size = 4; // track num + timecode + flags
+ return size + pkt->size;
+}
+
+static int mkv_blockgroup_size(AVPacket *pkt)
+{
+ int size = mkv_block_size(pkt);
+ size += ebml_num_size(size);
+ size += 2; // EBML ID for block and block duration
+ size += 8; // max size of block duration
+ size += ebml_num_size(size);
+ size += 1; // blockgroup EBML ID
+ return size;
+}
+
+static void mkv_write_block(AVFormatContext *s, unsigned int blockid, AVPacket *pkt, int flags)
+{
+ MatroskaMuxContext *mkv = s->priv_data;
+ ByteIOContext *pb = s->pb;
+
+ av_log(s, AV_LOG_DEBUG, "Writing block at offset %" PRIu64 ", size %d, "
+ "pts %" PRId64 ", dts %" PRId64 ", duration %d, flags %d\n",
+ url_ftell(pb), pkt->size, pkt->pts, pkt->dts, pkt->duration, flags);
+ put_ebml_id(pb, blockid);
+ put_ebml_num(pb, mkv_block_size(pkt), 0);
+ put_byte(pb, 0x80 | (pkt->stream_index + 1)); // this assumes stream_index is less than 126
+ put_be16(pb, pkt->pts - mkv->cluster_pts);
+ put_byte(pb, flags);
+ put_buffer(pb, pkt->data, pkt->size);
+}
+
static int mkv_write_packet(AVFormatContext *s, AVPacket *pkt)
{
MatroskaMuxContext *mkv = s->priv_data;
- ByteIOContext *pb = &s->pb;
- offset_t block;
+ ByteIOContext *pb = s->pb;
+ AVCodecContext *codec = s->streams[pkt->stream_index]->codec;
+ int keyframe = !!(pkt->flags & PKT_FLAG_KEY);
+ int duration = pkt->duration;
+ int ret;
// start a new cluster every 5 MB or 5 sec
- if (url_ftell(pb) > mkv->cluster + 5*1024*1024 || pkt->pts > mkv->cluster_pts + 5000) {
+ if (url_ftell(pb) > mkv->cluster_pos + 5*1024*1024 || pkt->pts > mkv->cluster_pts + 5000) {
+ av_log(s, AV_LOG_DEBUG, "Starting new cluster at offset %" PRIu64
+ " bytes, pts %" PRIu64 "\n", url_ftell(pb), pkt->pts);
end_ebml_master(pb, mkv->cluster);
- mkv->cluster = start_ebml_master(pb, MATROSKA_ID_CLUSTER);
+
+ ret = mkv_add_seekhead_entry(mkv->cluster_seekhead, MATROSKA_ID_CLUSTER, url_ftell(pb));
+ if (ret < 0) return ret;
+
+ mkv->cluster_pos = url_ftell(pb);
+ mkv->cluster = start_ebml_master(pb, MATROSKA_ID_CLUSTER, 0);
put_ebml_uint(pb, MATROSKA_ID_CLUSTERTIMECODE, pkt->pts);
mkv->cluster_pts = pkt->pts;
+ av_md5_update(mkv->md5_ctx, pkt->data, FFMIN(200, pkt->size));
}
- block = start_ebml_master(pb, MATROSKA_ID_SIMPLEBLOCK);
- put_byte(pb, 0x80 | (pkt->stream_index + 1)); // this assumes stream_index is less than 126
- put_be16(pb, pkt->pts - mkv->cluster_pts);
- put_byte(pb, !!(pkt->flags & PKT_FLAG_KEY));
- put_buffer(pb, pkt->data, pkt->size);
- end_ebml_master(pb, block);
+ if (codec->codec_id == CODEC_ID_H264 &&
+ codec->extradata_size > 0 && AV_RB32(codec->extradata) == 0x00000001) {
+ /* from x264 or from bytestream h264 */
+ /* nal reformating needed */
+ int ret = ff_avc_parse_nal_units(pkt->data, &pkt->data, &pkt->size);
+ if (ret < 0)
+ return ret;
+ assert(pkt->size);
+ }
+
+ if (codec->codec_type != CODEC_TYPE_SUBTITLE) {
+ mkv_write_block(s, MATROSKA_ID_SIMPLEBLOCK, pkt, keyframe << 7);
+ } else {
+ ebml_master blockgroup = start_ebml_master(pb, MATROSKA_ID_BLOCKGROUP, mkv_blockgroup_size(pkt));
+ duration = pkt->convergence_duration;
+ mkv_write_block(s, MATROSKA_ID_BLOCK, pkt, 0);
+ put_ebml_uint(pb, MATROSKA_ID_DURATION, duration);
+ end_ebml_master(pb, blockgroup);
+ }
+
+ if (codec->codec_type == CODEC_TYPE_VIDEO && keyframe) {
+ ret = mkv_add_cuepoint(mkv->cues, pkt, mkv->cluster_pos);
+ if (ret < 0) return ret;
+ }
+
+ mkv->duration = FFMAX(mkv->duration, pkt->pts + duration);
return 0;
}
static int mkv_write_trailer(AVFormatContext *s)
{
MatroskaMuxContext *mkv = s->priv_data;
- ByteIOContext *pb = &s->pb;
+ ByteIOContext *pb = s->pb;
+ offset_t currentpos, second_seekhead, cuespos;
+ int ret;
+
end_ebml_master(pb, mkv->cluster);
+
+ if (!url_is_streamed(pb)) {
+ cuespos = mkv_write_cues(pb, mkv->cues, s->nb_streams);
+ second_seekhead = mkv_write_seekhead(pb, mkv->cluster_seekhead);
+
+ ret = mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_CUES , cuespos);
+ if (ret < 0) return ret;
+ ret = mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_SEEKHEAD, second_seekhead);
+ if (ret < 0) return ret;
+ mkv_write_seekhead(pb, mkv->main_seekhead);
+
+ // update the duration
+ av_log(s, AV_LOG_DEBUG, "end duration = %" PRIu64 "\n", mkv->duration);
+ currentpos = url_ftell(pb);
+ url_fseek(pb, mkv->duration_offset, SEEK_SET);
+ put_ebml_float(pb, MATROSKA_ID_DURATION, mkv->duration);
+
+ // write the md5sum of some frames as the segment UID
+ if (!(s->streams[0]->codec->flags & CODEC_FLAG_BITEXACT)) {
+ uint8_t segment_uid[16];
+ av_md5_final(mkv->md5_ctx, segment_uid);
+ url_fseek(pb, mkv->segment_uid, SEEK_SET);
+ put_ebml_binary(pb, MATROSKA_ID_SEGMENTUID, segment_uid, 16);
+ }
+ url_fseek(pb, currentpos, SEEK_SET);
+ }
+
end_ebml_master(pb, mkv->segment);
+ av_free(mkv->md5_ctx);
return 0;
}
AVOutputFormat matroska_muxer = {
"matroska",
- "Matroska File Format",
+ NULL_IF_CONFIG_SMALL("Matroska file format"),
"video/x-matroska",
"mkv",
sizeof(MatroskaMuxContext),
mkv_write_header,
mkv_write_packet,
mkv_write_trailer,
- .codec_tag = (const AVCodecTag*[]){codec_bmp_tags, codec_wav_tags, 0},
+ .codec_tag = (const AVCodecTag* const []){codec_bmp_tags, codec_wav_tags, 0},
+ .subtitle_codec = CODEC_ID_TEXT,
+};
+
+AVOutputFormat matroska_audio_muxer = {
+ "matroska",
+ NULL_IF_CONFIG_SMALL("Matroska file format"),
+ "audio/x-matroska",
+ "mka",
+ sizeof(MatroskaMuxContext),
+ CODEC_ID_MP2,
+ CODEC_ID_NONE,
+ mkv_write_header,
+ mkv_write_packet,
+ mkv_write_trailer,
+ .codec_tag = (const AVCodecTag* const []){codec_wav_tags, 0},
};
projects / ffmpeg / blobdiff