matroska.c
资源名称:chapter15.rar [点击查看]
上传用户:hjq518
上传日期:2021-12-09
资源大小:5084k
文件大小:13k
源码类别:
Audio
开发平台:
Visual C++
- /*****************************************************************************
- * matroska.c:
- *****************************************************************************
- * Copyright (C) 2005 Mike Matsnev
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program 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 General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02111, USA.
- *****************************************************************************/
- #include <stdlib.h>
- #include <string.h>
- #include "common/osdep.h"
- #include "matroska.h"
- #define CLSIZE 1048576
- #define CHECK(x) do { if ((x) < 0) return -1; } while (0)
- struct mk_Context {
- struct mk_Context *next, **prev, *parent;
- struct mk_Writer *owner;
- unsigned id;
- void *data;
- unsigned d_cur, d_max;
- };
- typedef struct mk_Context mk_Context;
- struct mk_Writer {
- FILE *fp;
- unsigned duration_ptr;
- mk_Context *root, *cluster, *frame;
- mk_Context *freelist;
- mk_Context *actlist;
- int64_t def_duration;
- int64_t timescale;
- int64_t cluster_tc_scaled;
- int64_t frame_tc, prev_frame_tc_scaled, max_frame_tc;
- char wrote_header, in_frame, keyframe;
- };
- static mk_Context *mk_createContext(mk_Writer *w, mk_Context *parent, unsigned id) {
- mk_Context *c;
- if (w->freelist) {
- c = w->freelist;
- w->freelist = w->freelist->next;
- } else {
- c = malloc(sizeof(*c));
- memset(c, 0, sizeof(*c));
- }
- if (c == NULL)
- return NULL;
- c->parent = parent;
- c->owner = w;
- c->id = id;
- if (c->owner->actlist)
- c->owner->actlist->prev = &c->next;
- c->next = c->owner->actlist;
- c->prev = &c->owner->actlist;
- c->owner->actlist = c;
- return c;
- }
- static int mk_appendContextData(mk_Context *c, const void *data, unsigned size) {
- unsigned ns = c->d_cur + size;
- if (ns > c->d_max) {
- void *dp;
- unsigned dn = c->d_max ? c->d_max << 1 : 16;
- while (ns > dn)
- dn <<= 1;
- dp = realloc(c->data, dn);
- if (dp == NULL)
- return -1;
- c->data = dp;
- c->d_max = dn;
- }
- memcpy((char*)c->data + c->d_cur, data, size);
- c->d_cur = ns;
- return 0;
- }
- static int mk_writeID(mk_Context *c, unsigned id) {
- unsigned char c_id[4] = { id >> 24, id >> 16, id >> 8, id };
- if (c_id[0])
- return mk_appendContextData(c, c_id, 4);
- if (c_id[1])
- return mk_appendContextData(c, c_id+1, 3);
- if (c_id[2])
- return mk_appendContextData(c, c_id+2, 2);
- return mk_appendContextData(c, c_id+3, 1);
- }
- static int mk_writeSize(mk_Context *c, unsigned size) {
- unsigned char c_size[5] = { 0x08, size >> 24, size >> 16, size >> 8, size };
- if (size < 0x7f) {
- c_size[4] |= 0x80;
- return mk_appendContextData(c, c_size+4, 1);
- }
- if (size < 0x3fff) {
- c_size[3] |= 0x40;
- return mk_appendContextData(c, c_size+3, 2);
- }
- if (size < 0x1fffff) {
- c_size[2] |= 0x20;
- return mk_appendContextData(c, c_size+2, 3);
- }
- if (size < 0x0fffffff) {
- c_size[1] |= 0x10;
- return mk_appendContextData(c, c_size+1, 4);
- }
- return mk_appendContextData(c, c_size, 5);
- }
- static int mk_flushContextID(mk_Context *c) {
- unsigned char ff = 0xff;
- if (c->id == 0)
- return 0;
- CHECK(mk_writeID(c->parent, c->id));
- CHECK(mk_appendContextData(c->parent, &ff, 1));
- c->id = 0;
- return 0;
- }
- static int mk_flushContextData(mk_Context *c) {
- if (c->d_cur == 0)
- return 0;
- if (c->parent)
- CHECK(mk_appendContextData(c->parent, c->data, c->d_cur));
- else
- if (fwrite(c->data, c->d_cur, 1, c->owner->fp) != 1)
- return -1;
- c->d_cur = 0;
- return 0;
- }
- static int mk_closeContext(mk_Context *c, unsigned *off) {
- if (c->id) {
- CHECK(mk_writeID(c->parent, c->id));
- CHECK(mk_writeSize(c->parent, c->d_cur));
- }
- if (c->parent && off != NULL)
- *off += c->parent->d_cur;
- CHECK(mk_flushContextData(c));
- if (c->next)
- c->next->prev = c->prev;
- *(c->prev) = c->next;
- c->next = c->owner->freelist;
- c->owner->freelist = c;
- return 0;
- }
- static void mk_destroyContexts(mk_Writer *w) {
- mk_Context *cur, *next;
- for (cur = w->freelist; cur; cur = next) {
- next = cur->next;
- free(cur->data);
- free(cur);
- }
- for (cur = w->actlist; cur; cur = next) {
- next = cur->next;
- free(cur->data);
- free(cur);
- }
- w->freelist = w->actlist = w->root = NULL;
- }
- static int mk_writeStr(mk_Context *c, unsigned id, const char *str) {
- size_t len = strlen(str);
- CHECK(mk_writeID(c, id));
- CHECK(mk_writeSize(c, len));
- CHECK(mk_appendContextData(c, str, len));
- return 0;
- }
- static int mk_writeBin(mk_Context *c, unsigned id, const void *data, unsigned size) {
- CHECK(mk_writeID(c, id));
- CHECK(mk_writeSize(c, size));
- CHECK(mk_appendContextData(c, data, size));
- return 0;
- }
- static int mk_writeUInt(mk_Context *c, unsigned id, int64_t ui) {
- unsigned char c_ui[8] = { ui >> 56, ui >> 48, ui >> 40, ui >> 32, ui >> 24, ui >> 16, ui >> 8, ui };
- unsigned i = 0;
- CHECK(mk_writeID(c, id));
- while (i < 7 && c_ui[i] == 0)
- ++i;
- CHECK(mk_writeSize(c, 8 - i));
- CHECK(mk_appendContextData(c, c_ui+i, 8 - i));
- return 0;
- }
- static int mk_writeSInt(mk_Context *c, unsigned id, int64_t si) {
- unsigned char c_si[8] = { si >> 56, si >> 48, si >> 40, si >> 32, si >> 24, si >> 16, si >> 8, si };
- unsigned i = 0;
- CHECK(mk_writeID(c, id));
- if (si < 0)
- while (i < 7 && c_si[i] == 0xff && c_si[i+1] & 0x80)
- ++i;
- else
- while (i < 7 && c_si[i] == 0 && !(c_si[i+1] & 0x80))
- ++i;
- CHECK(mk_writeSize(c, 8 - i));
- CHECK(mk_appendContextData(c, c_si+i, 8 - i));
- return 0;
- }
- static int mk_writeFloatRaw(mk_Context *c, float f) {
- union {
- float f;
- unsigned u;
- } u;
- unsigned char c_f[4];
- u.f = f;
- c_f[0] = u.u >> 24;
- c_f[1] = u.u >> 16;
- c_f[2] = u.u >> 8;
- c_f[3] = u.u;
- return mk_appendContextData(c, c_f, 4);
- }
- static int mk_writeFloat(mk_Context *c, unsigned id, float f) {
- CHECK(mk_writeID(c, id));
- CHECK(mk_writeSize(c, 4));
- CHECK(mk_writeFloatRaw(c, f));
- return 0;
- }
- static unsigned mk_ebmlSizeSize(unsigned s) {
- if (s < 0x7f)
- return 1;
- if (s < 0x3fff)
- return 2;
- if (s < 0x1fffff)
- return 3;
- if (s < 0x0fffffff)
- return 4;
- return 5;
- }
- static unsigned mk_ebmlSIntSize(int64_t si) {
- unsigned char c_si[8] = { si >> 56, si >> 48, si >> 40, si >> 32, si >> 24, si >> 16, si >> 8, si };
- unsigned i = 0;
- if (si < 0)
- while (i < 7 && c_si[i] == 0xff && c_si[i+1] & 0x80)
- ++i;
- else
- while (i < 7 && c_si[i] == 0 && !(c_si[i+1] & 0x80))
- ++i;
- return 8 - i;
- }
- mk_Writer *mk_createWriter(const char *filename) {
- mk_Writer *w = malloc(sizeof(*w));
- if (w == NULL)
- return NULL;
- memset(w, 0, sizeof(*w));
- w->root = mk_createContext(w, NULL, 0);
- if (w->root == NULL) {
- free(w);
- return NULL;
- }
- w->fp = fopen(filename, "wb");
- if (w->fp == NULL) {
- mk_destroyContexts(w);
- free(w);
- return NULL;
- }
- w->timescale = 1000000;
- return w;
- }
- int mk_writeHeader(mk_Writer *w, const char *writingApp,
- const char *codecID,
- const void *codecPrivate, unsigned codecPrivateSize,
- int64_t default_frame_duration,
- int64_t timescale,
- unsigned width, unsigned height,
- unsigned d_width, unsigned d_height)
- {
- mk_Context *c, *ti, *v;
- if (w->wrote_header)
- return -1;
- w->timescale = timescale;
- w->def_duration = default_frame_duration;
- if ((c = mk_createContext(w, w->root, 0x1a45dfa3)) == NULL) // EBML
- return -1;
- CHECK(mk_writeUInt(c, 0x4286, 1)); // EBMLVersion
- CHECK(mk_writeUInt(c, 0x42f7, 1)); // EBMLReadVersion
- CHECK(mk_writeUInt(c, 0x42f2, 4)); // EBMLMaxIDLength
- CHECK(mk_writeUInt(c, 0x42f3, 8)); // EBMLMaxSizeLength
- CHECK(mk_writeStr(c, 0x4282, "matroska")); // DocType
- CHECK(mk_writeUInt(c, 0x4287, 1)); // DocTypeVersion
- CHECK(mk_writeUInt(c, 0x4285, 1)); // DocTypeReadversion
- CHECK(mk_closeContext(c, 0));
- if ((c = mk_createContext(w, w->root, 0x18538067)) == NULL) // Segment
- return -1;
- CHECK(mk_flushContextID(c));
- CHECK(mk_closeContext(c, 0));
- if ((c = mk_createContext(w, w->root, 0x1549a966)) == NULL) // SegmentInfo
- return -1;
- CHECK(mk_writeStr(c, 0x4d80, "Haali Matroska Writer b0"));
- CHECK(mk_writeStr(c, 0x5741, writingApp));
- CHECK(mk_writeUInt(c, 0x2ad7b1, w->timescale));
- CHECK(mk_writeFloat(c, 0x4489, 0));
- w->duration_ptr = c->d_cur - 4;
- CHECK(mk_closeContext(c, &w->duration_ptr));
- if ((c = mk_createContext(w, w->root, 0x1654ae6b)) == NULL) // tracks
- return -1;
- if ((ti = mk_createContext(w, c, 0xae)) == NULL) // TrackEntry
- return -1;
- CHECK(mk_writeUInt(ti, 0xd7, 1)); // TrackNumber
- CHECK(mk_writeUInt(ti, 0x73c5, 1)); // TrackUID
- CHECK(mk_writeUInt(ti, 0x83, 1)); // TrackType
- CHECK(mk_writeUInt(ti, 0x9c, 0)); // FlagLacing
- CHECK(mk_writeStr(ti, 0x86, codecID)); // CodecID
- if (codecPrivateSize)
- CHECK(mk_writeBin(ti, 0x63a2, codecPrivate, codecPrivateSize)); // CodecPrivate
- if (default_frame_duration)
- CHECK(mk_writeUInt(ti, 0x23e383, default_frame_duration)); // DefaultDuration
- if ((v = mk_createContext(w, ti, 0xe0)) == NULL) // Video
- return -1;
- CHECK(mk_writeUInt(v, 0xb0, width));
- CHECK(mk_writeUInt(v, 0xba, height));
- CHECK(mk_writeUInt(v, 0x54b0, d_width));
- CHECK(mk_writeUInt(v, 0x54ba, d_height));
- CHECK(mk_closeContext(v, 0));
- CHECK(mk_closeContext(ti, 0));
- CHECK(mk_closeContext(c, 0));
- CHECK(mk_flushContextData(w->root));
- w->wrote_header = 1;
- return 0;
- }
- static int mk_closeCluster(mk_Writer *w) {
- if (w->cluster == NULL)
- return 0;
- CHECK(mk_closeContext(w->cluster, 0));
- w->cluster = NULL;
- CHECK(mk_flushContextData(w->root));
- return 0;
- }
- static int mk_flushFrame(mk_Writer *w) {
- int64_t delta, ref = 0;
- unsigned fsize, bgsize;
- unsigned char c_delta_flags[3];
- if (!w->in_frame)
- return 0;
- delta = w->frame_tc/w->timescale - w->cluster_tc_scaled;
- if (delta > 32767ll || delta < -32768ll)
- CHECK(mk_closeCluster(w));
- if (w->cluster == NULL) {
- w->cluster_tc_scaled = w->frame_tc / w->timescale;
- w->cluster = mk_createContext(w, w->root, 0x1f43b675); // Cluster
- if (w->cluster == NULL)
- return -1;
- CHECK(mk_writeUInt(w->cluster, 0xe7, w->cluster_tc_scaled)); // Timecode
- delta = 0;
- }
- fsize = w->frame ? w->frame->d_cur : 0;
- bgsize = fsize + 4 + mk_ebmlSizeSize(fsize + 4) + 1;
- if (!w->keyframe) {
- ref = w->prev_frame_tc_scaled - w->cluster_tc_scaled - delta;
- bgsize += 1 + 1 + mk_ebmlSIntSize(ref);
- }
- CHECK(mk_writeID(w->cluster, 0xa0)); // BlockGroup
- CHECK(mk_writeSize(w->cluster, bgsize));
- CHECK(mk_writeID(w->cluster, 0xa1)); // Block
- CHECK(mk_writeSize(w->cluster, fsize + 4));
- CHECK(mk_writeSize(w->cluster, 1)); // track number
- c_delta_flags[0] = delta >> 8;
- c_delta_flags[1] = delta;
- c_delta_flags[2] = 0;
- CHECK(mk_appendContextData(w->cluster, c_delta_flags, 3));
- if (w->frame) {
- CHECK(mk_appendContextData(w->cluster, w->frame->data, w->frame->d_cur));
- w->frame->d_cur = 0;
- }
- if (!w->keyframe)
- CHECK(mk_writeSInt(w->cluster, 0xfb, ref)); // ReferenceBlock
- w->in_frame = 0;
- w->prev_frame_tc_scaled = w->cluster_tc_scaled + delta;
- if (w->cluster->d_cur > CLSIZE)
- CHECK(mk_closeCluster(w));
- return 0;
- }
- int mk_startFrame(mk_Writer *w) {
- if (mk_flushFrame(w) < 0)
- return -1;
- w->in_frame = 1;
- w->keyframe = 0;
- return 0;
- }
- int mk_setFrameFlags(mk_Writer *w,int64_t timestamp, int keyframe) {
- if (!w->in_frame)
- return -1;
- w->frame_tc = timestamp;
- w->keyframe = keyframe != 0;
- if (w->max_frame_tc < timestamp)
- w->max_frame_tc = timestamp;
- return 0;
- }
- int mk_addFrameData(mk_Writer *w, const void *data, unsigned size) {
- if (!w->in_frame)
- return -1;
- if (w->frame == NULL)
- if ((w->frame = mk_createContext(w, NULL, 0)) == NULL)
- return -1;
- return mk_appendContextData(w->frame, data, size);
- }
- int mk_close(mk_Writer *w) {
- int ret = 0;
- if (mk_flushFrame(w) < 0 || mk_closeCluster(w) < 0)
- ret = -1;
- if (w->wrote_header) {
- fseek(w->fp, w->duration_ptr, SEEK_SET);
- if (mk_writeFloatRaw(w->root, (float)((double)(w->max_frame_tc+w->def_duration) / w->timescale)) < 0 ||
- mk_flushContextData(w->root) < 0)
- ret = -1;
- }
- mk_destroyContexts(w);
- fclose(w->fp);
- free(w);
- return ret;
- }