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fdkaac/src/m4af.c

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/*
* Copyright (C) 2013 nu774
* For conditions of distribution and use, see copyright notice in COPYING
*/
#if HAVE_CONFIG_H
# include "config.h"
#endif
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <assert.h>
#include <time.h>
#if HAVE_STDINT_H
# include <stdint.h>
#endif
#if HAVE_INTTYPES_H
# include <inttypes.h>
#elif defined _MSC_VER
# define PRId64 "I64d"
#endif
#include "m4af.h"
#include "m4af_endian.h"
#define m4af_realloc(memory,size) realloc(memory, size)
#define m4af_free(memory) free(memory)
#define m4af_max(a,b) ((a)<(b)?(b):(a))
#define M4AF_ATOM_WILD 0xffffffff
typedef struct m4af_sample_entry_t {
uint32_t size;
uint32_t delta;
} m4af_sample_entry_t;
typedef struct m4af_chunk_entry_t {
int64_t offset;
uint32_t size;
uint32_t samples_per_chunk;
uint32_t duration;
} m4af_chunk_entry_t;
typedef struct m4af_itmf_entry_t {
uint32_t fcc;
char *name;
uint32_t type_code;
char *data;
uint32_t data_size;
} m4af_itmf_entry_t;
typedef struct m4af_track_t {
uint32_t codec;
uint32_t timescale;
uint16_t num_channels;
int64_t creation_time;
int64_t modification_time;
int64_t duration;
uint32_t frame_duration;
uint32_t encoder_delay;
uint32_t padding;
uint8_t *decSpecificInfo;
uint32_t decSpecificInfoSize;
uint32_t bufferSizeDB;
uint32_t maxBitrate;
uint32_t avgBitrate;
int is_vbr;
m4af_sample_entry_t *sample_table;
uint32_t num_samples;
uint32_t sample_table_capacity;
m4af_chunk_entry_t *chunk_table;
uint32_t num_chunks;
uint32_t chunk_table_capacity;
uint8_t *chunk_buffer;
uint32_t chunk_size;
uint32_t chunk_capacity;
/* temporary, to help parsing */
uint64_t stsc_pos;
uint64_t stsc_size;
uint64_t stts_pos;
uint64_t stts_size;
} m4af_track_t;
struct m4af_ctx_t {
uint32_t timescale;
int64_t creation_time;
int64_t modification_time;
int64_t mdat_pos;
int64_t mdat_size;
int priming_mode;
int last_error;
m4af_itmf_entry_t *itmf_table;
uint32_t num_tags;
uint32_t itmf_table_capacity;
m4af_io_callbacks_t io;
void *io_cookie;
uint16_t num_tracks;
m4af_track_t track[2];
m4af_itmf_entry_t current_tag;
};
typedef struct m4af_box_parser_t {
uint32_t name;
int (*handler)(m4af_ctx_t *ctx, uint32_t name, uint64_t size);
} m4af_box_parser_t;
static
int m4af_write_null_cb(void *cookie, const void *data, uint32_t size)
{
int64_t *pos = cookie;
*pos += size;
return 0;
}
static
int m4af_seek_null_cb(void *cookie, int64_t off, int whence)
{
int64_t *pos = cookie;
*pos = off; /* XXX: we use only SEEK_SET */
return 0;
}
static
int64_t m4af_tell_null_cb(void *cookie)
{
return *((int64_t*)cookie);
}
static m4af_io_callbacks_t m4af_null_io_callbacks = {
0, m4af_write_null_cb, m4af_seek_null_cb, m4af_tell_null_cb
};
static
int64_t m4af_timestamp(void)
{
return (int64_t)(time(0)) + (((1970 - 1904) * 365) + 17) * 24 * 60 * 60;
}
/*
* http://graphics.stanford.edu/~seander/bithacks.html#RoundUpPowerOf2
*/
static
uint32_t m4af_roundup(uint32_t n)
{
n--;
n |= n >> 1;
n |= n >> 2;
n |= n >> 4;
n |= n >> 8;
n |= n >> 16;
n++;
return n;
}
static
int64_t m4af_tell(m4af_ctx_t *ctx)
{
int64_t pos = -1;
if ((pos = ctx->io.tell(ctx->io_cookie)) < 0)
ctx->last_error = M4AF_IO_ERROR;
return pos;
}
static
int m4af_set_pos(m4af_ctx_t *ctx, int64_t pos)
{
int rc = -1;
if ((rc = ctx->io.seek(ctx->io_cookie, pos, SEEK_SET)) < 0)
ctx->last_error = M4AF_IO_ERROR;
return rc;
}
static
int m4af_write(m4af_ctx_t *ctx, const void *data, uint32_t size)
{
int rc = -1;
if ((rc = ctx->io.write(ctx->io_cookie, data, size)) < 0)
ctx->last_error = M4AF_IO_ERROR;
return rc;
}
static
int m4af_write16(m4af_ctx_t *ctx, uint32_t data)
{
data = m4af_htob16(data);
return m4af_write(ctx, &data, 2);
}
static
int m4af_write32(m4af_ctx_t *ctx, uint32_t data)
{
data = m4af_htob32(data);
return m4af_write(ctx, &data, 4);
}
static
int m4af_write64(m4af_ctx_t *ctx, uint64_t data)
{
data = m4af_htob64(data);
return m4af_write(ctx, &data, 8);
}
static
int m4af_write24(m4af_ctx_t *ctx, uint32_t data)
{
data = m4af_htob32(data << 8);
return m4af_write(ctx, &data, 3);
}
static
void m4af_write32_at(m4af_ctx_t *ctx, int64_t pos, uint32_t value)
{
int64_t current_pos = m4af_tell(ctx);
m4af_set_pos(ctx, pos);
m4af_write32(ctx, value);
m4af_set_pos(ctx, current_pos);
}
m4af_ctx_t *m4af_create(uint32_t codec, uint32_t timescale,
m4af_io_callbacks_t *io, void *io_cookie, int no_timestamp)
{
m4af_ctx_t *ctx;
int64_t timestamp;
if (codec != M4AF_FOURCC('m','p','4','a') &&
codec != M4AF_FOURCC('a','l','a','c'))
return 0;
if ((ctx = m4af_realloc(0, sizeof(m4af_ctx_t))) == 0)
return 0;
memset(ctx, 0, sizeof(m4af_ctx_t));
memcpy(&ctx->io, io, sizeof(m4af_io_callbacks_t));
ctx->io_cookie = io_cookie;
ctx->timescale = timescale;
timestamp = no_timestamp ? 0 : m4af_timestamp();
ctx->creation_time = timestamp;
ctx->modification_time = timestamp;
ctx->num_tracks = 1;
ctx->track[0].codec = codec;
ctx->track[0].timescale = timescale;
ctx->track[0].creation_time = timestamp;
ctx->track[0].modification_time = timestamp;
ctx->track[0].num_channels = 2;
return ctx;
}
static
void m4af_free_itmf_table(m4af_ctx_t *ctx)
{
uint32_t i;
m4af_itmf_entry_t *entry = ctx->itmf_table;
for (i = 0; i < ctx->num_tags; ++i, ++entry) {
if (entry->fcc == M4AF_FOURCC('-','-','-','-'))
m4af_free(entry->name);
m4af_free(entry->data);
}
m4af_free(ctx->itmf_table);
}
static
void m4af_clear_track(m4af_ctx_t *ctx, int track_idx)
{
m4af_track_t *track = ctx->track + track_idx;
if (track->decSpecificInfo)
m4af_free(track->decSpecificInfo);
if (track->sample_table)
m4af_free(track->sample_table);
if (track->chunk_table)
m4af_free(track->chunk_table);
if (track->chunk_buffer)
m4af_free(track->chunk_buffer);
memset(track, 0, sizeof(m4af_track_t));
}
void m4af_teardown(m4af_ctx_t **ctxp)
{
unsigned i;
m4af_ctx_t *ctx = *ctxp;
for (i = 0; i < ctx->num_tracks; ++i)
m4af_clear_track(ctx, i);
if (ctx->itmf_table)
m4af_free_itmf_table(ctx);
m4af_free(ctx);
*ctxp = 0;
}
void m4af_set_num_channels(m4af_ctx_t *ctx, uint32_t track_idx,
uint16_t channels)
{
ctx->track[track_idx].num_channels = channels;
}
void m4af_set_fixed_frame_duration(m4af_ctx_t *ctx, uint32_t track_idx,
uint32_t length)
{
ctx->track[track_idx].frame_duration = length;
}
int m4af_set_decoder_specific_info(m4af_ctx_t *ctx, uint32_t track_idx,
uint8_t *data, uint32_t size)
{
m4af_track_t *track = &ctx->track[track_idx];
if (size > track->decSpecificInfoSize) {
uint8_t *memory = m4af_realloc(track->decSpecificInfo, size);
if (memory == 0) {
ctx->last_error = M4AF_NO_MEMORY;
goto DONE;
}
track->decSpecificInfo = memory;
}
if (size > 0)
memcpy(track->decSpecificInfo, data, size);
track->decSpecificInfoSize = size;
DONE:
return ctx->last_error;
}
void m4af_set_vbr_mode(m4af_ctx_t *ctx, uint32_t track_idx, int is_vbr)
{
m4af_track_t *track = &ctx->track[track_idx];
track->is_vbr = is_vbr;
}
void m4af_set_priming(m4af_ctx_t *ctx, uint32_t track_idx,
uint32_t encoder_delay, uint32_t padding)
{
m4af_track_t *track = &ctx->track[track_idx];
track->encoder_delay = encoder_delay;
track->padding = padding;
}
void m4af_set_priming_mode(m4af_ctx_t *ctx, int mode)
{
ctx->priming_mode = mode;
}
static
int m4af_add_sample_entry(m4af_ctx_t *ctx, uint32_t track_idx,
uint32_t size, uint32_t delta)
{
m4af_track_t *track = &ctx->track[track_idx];
m4af_sample_entry_t *entry;
if (ctx->last_error)
return -1;
if (track->num_samples == track->sample_table_capacity) {
uint32_t new_size = track->sample_table_capacity;
new_size = new_size ? new_size * 2 : 1;
entry = m4af_realloc(track->sample_table, new_size * sizeof(*entry));
if (entry == 0) {
ctx->last_error = M4AF_NO_MEMORY;
return -1;
}
track->sample_table = entry;
track->sample_table_capacity = new_size;
}
entry = track->sample_table + track->num_samples;
entry->size = size;
entry->delta = delta;
++track->num_samples;
return 0;
}
static
int m4af_flush_chunk(m4af_ctx_t *ctx, uint32_t track_idx)
{
m4af_track_t *track = &ctx->track[track_idx];
m4af_chunk_entry_t *entry;
if (!track->num_chunks || !track->chunk_size)
return 0;
entry = &track->chunk_table[track->num_chunks - 1];
entry->offset = m4af_tell(ctx);
m4af_write(ctx, track->chunk_buffer, track->chunk_size);
ctx->mdat_size += track->chunk_size;
track->chunk_size = 0;
return ctx->last_error ? -1 : 0;
}
static
int m4af_add_chunk_entry(m4af_ctx_t *ctx, uint32_t track_idx)
{
m4af_track_t *track = &ctx->track[track_idx];
m4af_chunk_entry_t *entry;
if (track->num_chunks == track->chunk_table_capacity) {
uint32_t new_size = track->chunk_table_capacity;
new_size = new_size ? new_size * 2 : 1;
entry = m4af_realloc(track->chunk_table, new_size * sizeof(*entry));
if (entry == 0) {
ctx->last_error = M4AF_NO_MEMORY;
return -1;
}
track->chunk_table = entry;
track->chunk_table_capacity = new_size;
}
memset(&track->chunk_table[track->num_chunks++], 0,
sizeof(m4af_chunk_entry_t));
return 0;
}
static
int m4af_update_chunk_table(m4af_ctx_t *ctx, uint32_t track_idx,
uint32_t size, uint32_t delta)
{
m4af_track_t *track = &ctx->track[track_idx];
m4af_chunk_entry_t *entry;
int add_new_chunk = 0;
if (ctx->last_error)
return -1;
if (track->num_chunks == 0)
add_new_chunk = 1;
else {
entry = &track->chunk_table[track->num_chunks - 1];
if (entry->duration + delta > track->timescale / 2)
add_new_chunk = 1;
}
if (add_new_chunk) {
m4af_flush_chunk(ctx, track_idx);
if (m4af_add_chunk_entry(ctx, track_idx) < 0)
return -1;
}
entry = &track->chunk_table[track->num_chunks - 1];
entry->size += size;
++entry->samples_per_chunk;
entry->duration += delta;
return 0;
}
static
void m4af_update_max_bitrate(m4af_ctx_t *ctx, uint32_t track_idx)
{
m4af_track_t *track = &ctx->track[track_idx];
uint32_t duration = 0, size = 0, bitrate;
m4af_sample_entry_t *ent = track->sample_table + track->num_samples - 1;
for (; ent >= track->sample_table && duration < track->timescale; --ent) {
duration += ent->delta;
size += ent->size;
}
bitrate = (uint32_t)(size * 8.0 * track->timescale / duration + .5);
if (bitrate > track->maxBitrate)
track->maxBitrate = bitrate;
}
static
int m4af_append_sample_to_chunk(m4af_ctx_t *ctx, uint32_t track_idx,
const void *data, uint32_t size)
{
m4af_track_t *track = &ctx->track[track_idx];
uint32_t newsize = track->chunk_size + size;
if (ctx->last_error)
return -1;
if (track->chunk_capacity < newsize) {
uint32_t capacity = m4af_roundup(newsize);
uint8_t *memory = realloc(track->chunk_buffer, capacity);
if (!memory) {
ctx->last_error = M4AF_NO_MEMORY;
return -1;
}
track->chunk_buffer = memory;
track->chunk_capacity = capacity;
}
memcpy(track->chunk_buffer + track->chunk_size, data, size);
track->chunk_size = newsize;
return 0;
}
int m4af_write_sample(m4af_ctx_t *ctx, uint32_t track_idx, const void *data,
uint32_t size, uint32_t duration)
{
m4af_track_t *track = &ctx->track[track_idx];
if (track->frame_duration)
duration = track->frame_duration;
if (size > track->bufferSizeDB)
track->bufferSizeDB = size;
track->duration += duration;
m4af_add_sample_entry(ctx, track_idx, size, duration);
m4af_update_chunk_table(ctx, track_idx, size, duration);
m4af_update_max_bitrate(ctx, track_idx);
m4af_append_sample_to_chunk(ctx, track_idx, data, size);
return ctx->last_error;
}
static
m4af_itmf_entry_t *m4af_find_itmf_slot(m4af_ctx_t *ctx, uint32_t fcc,
const char *name)
{
m4af_itmf_entry_t *entry = ctx->itmf_table;
if (name)
fcc = M4AF_FOURCC('-','-','-','-');
if (fcc != M4AF_TAG_ARTWORK)
for (; entry != ctx->itmf_table + ctx->num_tags; ++entry)
if (fcc == entry->fcc && (!name || !strcmp(name, entry->name)))
return entry;
if (ctx->num_tags == ctx->itmf_table_capacity) {
uint32_t new_size = ctx->itmf_table_capacity;
new_size = new_size ? new_size * 2 : 1;
entry = m4af_realloc(ctx->itmf_table, new_size * sizeof(*entry));
if (entry == 0) {
ctx->last_error = M4AF_NO_MEMORY;
return 0;
}
ctx->itmf_table = entry;
ctx->itmf_table_capacity = new_size;
}
entry = &ctx->itmf_table[ctx->num_tags++];
memset(entry, 0, sizeof(m4af_itmf_entry_t));
entry->fcc = fcc;
if (name) {
char *name_copy = m4af_realloc(0, strlen(name) + 1);
if (!name_copy) {
ctx->last_error = M4AF_NO_MEMORY;
--ctx->num_tags;
return 0;
}
strcpy(name_copy, name);
entry->name = name_copy;
}
return entry;
}
int m4af_add_itmf_long_tag(m4af_ctx_t *ctx, const char *name,
const char *data)
{
m4af_itmf_entry_t *entry;
char *data_copy = 0;
size_t name_len = strlen(name);
size_t data_len = strlen(data);
if (!name_len || !data_len)
return 0;
if ((entry = m4af_find_itmf_slot(ctx, 0, name)) == 0)
goto FAIL;
entry->type_code = M4AF_UTF8;
if ((data_copy = m4af_realloc(entry->data, data_len)) == 0) {
ctx->last_error = M4AF_NO_MEMORY;
goto FAIL;
}
memcpy(data_copy, data, data_len);
entry->data = data_copy;
entry->data_size = data_len;
return 0;
FAIL:
return ctx->last_error;
}
int m4af_add_itmf_short_tag(m4af_ctx_t *ctx, uint32_t fcc,
uint32_t type_code, const void *data,
uint32_t data_size)
{
m4af_itmf_entry_t *entry;
char *data_copy = 0;
if (!data_size)
return 0;
if ((entry = m4af_find_itmf_slot(ctx, fcc, 0)) == 0)
goto FAIL;
entry->type_code = type_code;
if ((data_copy = m4af_realloc(entry->data, data_size)) == 0) {
ctx->last_error = M4AF_NO_MEMORY;
goto FAIL;
}
memcpy(data_copy, data, data_size);
entry->data = data_copy;
entry->data_size = data_size;
return 0;
FAIL:
return ctx->last_error;
}
int m4af_add_itmf_string_tag(m4af_ctx_t *ctx, uint32_t fcc, const char *data)
{
return m4af_add_itmf_short_tag(ctx, fcc, M4AF_UTF8, data, strlen(data));
}
int m4af_add_itmf_int8_tag(m4af_ctx_t *ctx, uint32_t fcc, int value)
{
uint8_t data = value;
return m4af_add_itmf_short_tag(ctx, fcc, M4AF_INTEGER, &data, 1);
}
int m4af_add_itmf_int16_tag(m4af_ctx_t *ctx, uint32_t fcc, int value)
{
uint16_t data = m4af_htob16(value);
return m4af_add_itmf_short_tag(ctx, fcc, M4AF_INTEGER, &data, 2);
}
int m4af_add_itmf_int32_tag(m4af_ctx_t *ctx, uint32_t fcc, uint32_t value)
{
uint32_t data = m4af_htob32(value);
return m4af_add_itmf_short_tag(ctx, fcc, M4AF_INTEGER, &data, 4);
}
int m4af_add_itmf_int64_tag(m4af_ctx_t *ctx, uint32_t fcc, uint64_t value)
{
uint64_t data = m4af_htob64(value);
return m4af_add_itmf_short_tag(ctx, fcc, M4AF_INTEGER, &data, 8);
}
int m4af_add_itmf_track_tag(m4af_ctx_t *ctx, int track, int total)
{
uint16_t data[4] = { 0 };
data[1] = m4af_htob16(track);
data[2] = m4af_htob16(total);
return m4af_add_itmf_short_tag(ctx, M4AF_FOURCC('t','r','k','n'),
M4AF_IMPLICIT, &data, 8);
}
int m4af_add_itmf_disk_tag(m4af_ctx_t *ctx, int disk, int total)
{
uint16_t data[3] = { 0 };
data[1] = m4af_htob16(disk);
data[2] = m4af_htob16(total);
return m4af_add_itmf_short_tag(ctx, M4AF_FOURCC('d','i','s','k'),
M4AF_IMPLICIT, &data, 6);
}
int m4af_add_itmf_genre_tag(m4af_ctx_t *ctx, int genre)
{
uint16_t data = m4af_htob16(genre);
return m4af_add_itmf_short_tag(ctx, M4AF_FOURCC('g','n','r','e'),
M4AF_IMPLICIT, &data, 2);
}
static
int m4af_set_iTunSMPB(m4af_ctx_t *ctx)
{
const char *fmt = " 00000000 %08X %08X %08X%08X 00000000 00000000 "
"00000000 00000000 00000000 00000000 00000000 00000000";
m4af_track_t *track = &ctx->track[0];
char buf[256];
uint64_t length = track->duration - track->encoder_delay - track->padding;
sprintf(buf, fmt, track->encoder_delay, track->padding,
(uint32_t)(length >> 32), (uint32_t)length);
return m4af_add_itmf_long_tag(ctx, "iTunSMPB", buf);
}
static
uint32_t m4af_update_box_size(m4af_ctx_t *ctx, int64_t pos)
{
int64_t current_pos = m4af_tell(ctx);
m4af_set_pos(ctx, pos);
m4af_write32(ctx, current_pos - pos);
m4af_set_pos(ctx, current_pos);
return current_pos - pos;
}
static
void m4af_write_descriptor(m4af_ctx_t *ctx, uint32_t tag, uint32_t size)
{
uint8_t buf[5];
buf[0] = tag;
buf[1] = ((size >> 21) | 0x80);
buf[2] = ((size >> 14) | 0x80);
buf[3] = ((size >> 7) | 0x80);
buf[4] = (size & 0x7f);
m4af_write(ctx, buf, 5);
}
static
void m4af_write_ftyp_box(m4af_ctx_t *ctx)
{
m4af_write(ctx, "\0\0\0\040""ftypM4A \0\0\0\0M4A mp42isom\0\0\0\0", 32);
}
static
void m4af_write_free_box(m4af_ctx_t *ctx, uint32_t size)
{
int64_t pos = m4af_tell(ctx);
m4af_write32(ctx, size + 8);
m4af_write(ctx, "free", 4);
if (size > 0)
m4af_set_pos(ctx, pos + size + 8);
}
int m4af_begin_write(m4af_ctx_t *ctx)
{
m4af_write_ftyp_box(ctx);
m4af_write_free_box(ctx, 0);
m4af_write(ctx, "\0\0\0\0mdat", 8);
ctx->mdat_pos = m4af_tell(ctx);
return ctx->last_error;
}
static
void m4af_write_stco_box(m4af_ctx_t *ctx, uint32_t track_idx)
{
m4af_track_t *track = &ctx->track[track_idx];
uint32_t i;
m4af_chunk_entry_t *index = track->chunk_table;
int is_co64 = index[track->num_chunks - 1].offset > 0xffffffff;
int64_t pos = m4af_tell(ctx);
m4af_write32(ctx, 0); /* size */
m4af_write(ctx, is_co64 ? "co64" : "stco", 4);
m4af_write32(ctx, 0); /* version and flags */
m4af_write32(ctx, track->num_chunks);
for (i = 0; i < track->num_chunks; ++i, ++index) {
if (is_co64)
m4af_write64(ctx, index->offset);
else
m4af_write32(ctx, index->offset);
}
m4af_update_box_size(ctx, pos);
}
static
void m4af_write_stsz_box(m4af_ctx_t *ctx, uint32_t track_idx)
{
m4af_track_t *track = &ctx->track[track_idx];
m4af_sample_entry_t *index = track->sample_table;
uint32_t i;
int64_t pos = m4af_tell(ctx);
m4af_write(ctx,
"\0\0\0\0" /* size */
"stsz" /* type */
"\0" /* version */
"\0\0\0" /* flags */
"\0\0\0\0" /* sample_size: 0(variable) */
, 16);
m4af_write32(ctx, track->num_samples);
for (i = 0; i < track->num_samples; ++i, ++index)
m4af_write32(ctx, index->size);
m4af_update_box_size(ctx, pos);
}
static
void m4af_write_stsc_box(m4af_ctx_t *ctx, uint32_t track_idx)
{
m4af_track_t *track = &ctx->track[track_idx];
m4af_chunk_entry_t *index = track->chunk_table;
uint32_t i, prev_samples_per_chunk = 0, entry_count = 0;
int64_t pos = m4af_tell(ctx);
m4af_write(ctx,
"\0\0\0\0" /* size */
"stsc" /* type */
"\0" /* version */
"\0\0\0" /* flags */
"\0\0\0\0" /* entry_count */
, 16);
for (i = 0; i < track->num_chunks; ++i, ++index) {
if (index->samples_per_chunk != prev_samples_per_chunk) {
++entry_count;
m4af_write32(ctx, i + 1);
m4af_write32(ctx, index->samples_per_chunk);
m4af_write32(ctx, 1); /* sample_description_index */
prev_samples_per_chunk = index->samples_per_chunk;
}
}
m4af_write32_at(ctx, pos + 12, entry_count);
m4af_update_box_size(ctx, pos);
}
static
void m4af_write_stts_box(m4af_ctx_t *ctx, uint32_t track_idx)
{
m4af_track_t *track = &ctx->track[track_idx];
m4af_sample_entry_t *index = track->sample_table;
uint32_t i, prev_delta = 0, entry_count = 0, sample_count = 0;
int64_t pos = m4af_tell(ctx);
m4af_write(ctx,
"\0\0\0\0" /* size */
"stts" /* type */
"\0" /* version */
"\0\0\0" /* flags */
"\0\0\0\0" /* entry_count */
, 16);
for (i = 0; i < track->num_samples; ++i, ++index) {
if (index->delta == prev_delta)
++sample_count;
else {
++entry_count;
if (sample_count) {
m4af_write32(ctx, sample_count);
m4af_write32(ctx, prev_delta);
}
prev_delta = index->delta;
sample_count = 1;
}
}
if (sample_count) {
m4af_write32(ctx, sample_count);
m4af_write32(ctx, prev_delta);
}
m4af_write32_at(ctx, pos + 12, entry_count);
m4af_update_box_size(ctx, pos);
}
static
void m4af_write_esds_box(m4af_ctx_t *ctx, uint32_t track_idx)
{
m4af_track_t *track = &ctx->track[track_idx];
int64_t pos = m4af_tell(ctx);
m4af_write(ctx, "\0\0\0\0esds", 8);
m4af_write32(ctx, 0); /* version + flags */
/* ES_Descriptor */
m4af_write_descriptor(ctx, 3, 32 + track->decSpecificInfoSize);
m4af_write(ctx, "\0\0\0", 3);
/* DecoderConfigDescriptor */
m4af_write_descriptor(ctx, 4, 18 + track->decSpecificInfoSize);
m4af_write(ctx,
"\x40" /* objectTypeIndication: 0x40(Audio ISO/IEC 14496-3)*/
"\x15" /* streamType(6): 0x05(AudioStream)
* upStream(1) : 0
* reserved(1) : 1
*/
, 2);
m4af_write24(ctx, track->bufferSizeDB);
m4af_write32(ctx, track->maxBitrate);
m4af_write32(ctx, track->is_vbr ? 0: track->avgBitrate);
/* DecoderSpecificInfo */
m4af_write_descriptor(ctx, 5, track->decSpecificInfoSize);
m4af_write(ctx, track->decSpecificInfo, track->decSpecificInfoSize);
/* SLConfigDescriptor */
m4af_write_descriptor(ctx, 6, 1);
m4af_write(ctx, "\002", 1); /* predefined */
m4af_update_box_size(ctx, pos);
}
static
void m4af_write_alac_box(m4af_ctx_t *ctx, uint32_t track_idx)
{
m4af_track_t *track = &ctx->track[track_idx];
int64_t pos = m4af_tell(ctx);
m4af_write(ctx,
"\0\0\0\0" /* size */
"alac" /* type */
"\0" /* version */
"\0\0\0" /* flags */
, 12);
m4af_write(ctx, track->decSpecificInfo, track->decSpecificInfoSize);
m4af_update_box_size(ctx, pos);
}
static
void m4af_write_mp4a_box(m4af_ctx_t *ctx, uint32_t track_idx)
{
m4af_track_t *track = &ctx->track[track_idx];
int64_t pos = m4af_tell(ctx);
m4af_write32(ctx, 0); /* size */
m4af_write32(ctx, track->codec); /* mp4a or alac */
m4af_write(ctx,
"\0\0\0\0\0\0" /* reserved */
"\0\001" /* data_reference_index: 1 */
"\0\0\0\0" /* reserved[0] */
"\0\0\0\0" /* reserved[1] */
,16);
m4af_write16(ctx, track->num_channels);
m4af_write(ctx,
"\0\020" /* samplesize: 16 */
"\0\0" /* pre_defined */
"\0\0" /* reserved */
,6);
if (track->codec == M4AF_FOURCC('m','p','4','a')) {
m4af_write32(ctx, track->timescale << 16);
m4af_write_esds_box(ctx, track_idx);
} else {
m4af_write32(ctx, 44100 << 16);
m4af_write_alac_box(ctx, track_idx);
}
m4af_update_box_size(ctx, pos);
}
static
void m4af_write_stsd_box(m4af_ctx_t *ctx, uint32_t track_idx)
{
int64_t pos = m4af_tell(ctx);
m4af_write(ctx, "\0\0\0\0stsd", 8);
m4af_write(ctx,
"\0" /* version */
"\0\0\0" /* flags */
"\0\0\0\001" /* entry_count: 1 */
, 8);
m4af_write_mp4a_box(ctx, track_idx);
m4af_update_box_size(ctx, pos);
}
static
void m4af_write_sbgp_box(m4af_ctx_t *ctx, uint32_t track_idx)
{
m4af_track_t *track = &ctx->track[track_idx];
m4af_write(ctx,
"\0\0\0\034" /* size: 28 */
"sbgp" /* type */
"\0" /* version */
"\0\0\0" /* flags */
"roll" /* grouping_type */
"\0\0\0\001" /* entry_count: 1 */
, 20);
m4af_write32(ctx, track->num_samples);
m4af_write32(ctx, 1); /* group_description_index */
}
static
void m4af_write_sgpd_box(m4af_ctx_t *ctx, uint32_t track_idx)
{
m4af_write(ctx,
"\0\0\0\026" /* size: 22 */
"sgpd" /* type */
"\0" /* version */
"\0\0\0" /* flags */
"roll" /* grouping_type */
"\0\0\0\001" /* entry_count: 1 */
"\377\377" /* payload_data: -1 */
, 22);
}
static
void m4af_write_stbl_box(m4af_ctx_t *ctx, uint32_t track_idx)
{
m4af_track_t *track = &ctx->track[track_idx];
int64_t pos = m4af_tell(ctx);
m4af_write(ctx, "\0\0\0\0stbl", 8);
m4af_write_stsd_box(ctx, track_idx);
if ((ctx->priming_mode & M4AF_PRIMING_MODE_EDTS) &&
(track->encoder_delay || track->padding)) {
m4af_write_sbgp_box(ctx, track_idx);
m4af_write_sgpd_box(ctx, track_idx);
}
m4af_write_stts_box(ctx, track_idx);
m4af_write_stsc_box(ctx, track_idx);
m4af_write_stsz_box(ctx, track_idx);
m4af_write_stco_box(ctx, track_idx);
m4af_update_box_size(ctx, pos);
}
static
void m4af_write_url_box(m4af_ctx_t *ctx, uint32_t track_idx)
{
m4af_write(ctx,
"\0\0\0\014" /* size */
"url " /* type */
"\0" /* version */
"\0\0\001" /* flags: 1(in the same file) */
, 12);
}
static
void m4af_write_dref_box(m4af_ctx_t *ctx, uint32_t track_idx)
{
int64_t pos = m4af_tell(ctx);
m4af_write(ctx, "\0\0\0\0dref", 8);
m4af_write(ctx,
"\0" /* version */
"\0\0\0" /* flags */
"\0\0\0\001" /* entry_count: 1 */
,8);
m4af_write_url_box(ctx, track_idx);
m4af_update_box_size(ctx, pos);
}
static
void m4af_write_dinf_box(m4af_ctx_t *ctx, uint32_t track_idx)
{
int64_t pos = m4af_tell(ctx);
m4af_write(ctx, "\0\0\0\0dinf", 8);
m4af_write_dref_box(ctx, track_idx);
m4af_update_box_size(ctx, pos);
}
static
void m4af_write_smhd_box(m4af_ctx_t *ctx, uint32_t track_idx)
{
m4af_write(ctx,
"\0\0\0\020" /* size */
"smhd" /* type */
"\0" /* version */
"\0\0\0" /* flags */
"\0\0" /* balance */
"\0\0" /* reserved */
, 16);
}
static
void m4af_write_minf_box(m4af_ctx_t *ctx, uint32_t track_idx)
{
m4af_track_t *track = &ctx->track[track_idx];
int64_t pos = m4af_tell(ctx);
m4af_write(ctx, "\0\0\0\0minf", 8);
/* TODO: add TEXT support */
if (track->codec != M4AF_CODEC_TEXT)
m4af_write_smhd_box(ctx, track_idx);
m4af_write_dinf_box(ctx, track_idx);
m4af_write_stbl_box(ctx, track_idx);
m4af_update_box_size(ctx, pos);
}
static
void m4af_write_mdhd_box(m4af_ctx_t *ctx, uint32_t track_idx)
{
m4af_track_t *track = &ctx->track[track_idx];
int64_t pos = m4af_tell(ctx);
uint8_t version = (track->creation_time > UINT32_MAX ||
track->modification_time > UINT32_MAX ||
track->duration > UINT32_MAX);
m4af_write(ctx, "\0\0\0\0mdhd", 8);
m4af_write(ctx, &version, 1);
m4af_write(ctx, "\0\0\0", 3); /* flags */
if (version) {
m4af_write64(ctx, track->creation_time);
m4af_write64(ctx, track->modification_time);
m4af_write32(ctx, track->timescale);
m4af_write64(ctx, track->duration);
} else {
m4af_write32(ctx, track->creation_time);
m4af_write32(ctx, track->modification_time);
m4af_write32(ctx, track->timescale);
m4af_write32(ctx, track->duration);
}
m4af_write(ctx,
"\x55\xc4" /* language: und */
"\0\0" /* pre_defined */
, 4);
m4af_update_box_size(ctx, pos);
}
static
void m4af_write_hdlr_box(m4af_ctx_t *ctx, uint32_t track_idx, const char *type)
{
int64_t pos = m4af_tell(ctx);
static const char reserved_and_name[10] = { 0 };
m4af_write(ctx,
"\0\0\0\0" /* size */
"hdlr" /* type */
"\0" /* version */
"\0\0\0" /* flags */
"\0\0\0\0" /* pre_defined */
, 16);
m4af_write(ctx, type, 4); /* handler_type */
/* reserved[0] */
m4af_write(ctx, !strcmp(type, "mdir") ? "appl" : "\0\0\0\0", 4);
/* reserved[1], reserved[2], name */
m4af_write(ctx, reserved_and_name, 9);
m4af_update_box_size(ctx, pos);
}
static
void m4af_write_mdia_box(m4af_ctx_t *ctx, uint32_t track_idx)
{
m4af_track_t *track = &ctx->track[track_idx];
const char *hdlr =
(track->codec == M4AF_CODEC_TEXT) ? "text" : "soun";
int64_t pos = m4af_tell(ctx);
m4af_write(ctx, "\0\0\0\0mdia", 8);
m4af_write_mdhd_box(ctx, track_idx);
m4af_write_hdlr_box(ctx, track_idx, hdlr);
m4af_write_minf_box(ctx, track_idx);
m4af_update_box_size(ctx, pos);
}
static
void m4af_write_elst_box(m4af_ctx_t *ctx, uint32_t track_idx)
{
m4af_track_t *track = &ctx->track[track_idx];
uint8_t version;
int64_t duration = track->duration - track->encoder_delay - track->padding;
int64_t pos = m4af_tell(ctx);
duration = (double)duration / track->timescale * ctx->timescale + .5;
version = (duration > UINT32_MAX);
m4af_write(ctx, "\0\0\0\0elst", 8);
m4af_write(ctx, &version, 1);
m4af_write(ctx, "\0\0\0", 3); /* flags */
m4af_write32(ctx, 1); /* entry_count: 1 */
if (version) {
m4af_write64(ctx, duration);
m4af_write64(ctx, track->encoder_delay);
} else {
m4af_write32(ctx, duration);
m4af_write32(ctx, track->encoder_delay);
}
m4af_write16(ctx, 1); /* media_rate_integer */
m4af_write16(ctx, 0); /* media_rate_fraction */
m4af_update_box_size(ctx, pos);
}
static
void m4af_write_edts_box(m4af_ctx_t *ctx, uint32_t track_idx)
{
int64_t pos = m4af_tell(ctx);
m4af_write(ctx, "\0\0\0\0edts", 8);
m4af_write_elst_box(ctx, track_idx);
m4af_update_box_size(ctx, pos);
}
static
void m4af_write_tkhd_box(m4af_ctx_t *ctx, uint32_t track_idx)
{
m4af_track_t *track = &ctx->track[track_idx];
int64_t pos = m4af_tell(ctx);
int64_t duration = track->duration;
if (ctx->priming_mode & M4AF_PRIMING_MODE_EDTS)
duration -= (track->encoder_delay + track->padding);
duration = (double)duration / track->timescale * ctx->timescale + .5;
uint8_t version = (track->creation_time > UINT32_MAX ||
track->modification_time > UINT32_MAX ||
duration > UINT32_MAX);
m4af_write(ctx, "\0\0\0\0tkhd", 8);
m4af_write(ctx, &version, 1);
m4af_write(ctx, "\0\0\007", 3); /* flags */
if (version) {
m4af_write64(ctx, track->creation_time);
m4af_write64(ctx, track->modification_time);
m4af_write32(ctx, track_idx + 1);
m4af_write(ctx, "\0\0\0\0" /* reserved */
, 4);
m4af_write64(ctx, duration);
} else {
m4af_write32(ctx, track->creation_time);
m4af_write32(ctx, track->modification_time);
m4af_write32(ctx, track_idx + 1);
m4af_write(ctx, "\0\0\0\0" /* reserved */
, 4);
m4af_write32(ctx, duration);
}
m4af_write(ctx,
"\0\0\0\0" /* reserved[0] */
"\0\0\0\0" /* reserved[1] */
"\0\0" /* layer */
"\0\0" /* alternate_group */
"\001\0" /* volume: 1.0 */
"\0\0" /* reserved */
"\0\001\0\0" /* matrix[0] */
"\0\0\0\0" /* matrix[1] */
"\0\0\0\0" /* matrix[2] */
"\0\0\0\0" /* matrix[3] */
"\0\001\0\0" /* matrix[4] */
"\0\0\0\0" /* matrix[5] */
"\0\0\0\0" /* matrix[6] */
"\0\0\0\0" /* matrix[7] */
"\100\0\0\0" /* matrix[8] */
"\0\0\0\0" /* width */
"\0\0\0\0" /* height */
, 60);
m4af_update_box_size(ctx, pos);
}
static
void m4af_write_trak_box(m4af_ctx_t *ctx, uint32_t track_idx)
{
m4af_track_t *track = &ctx->track[track_idx];
int64_t pos = m4af_tell(ctx);
m4af_write(ctx, "\0\0\0\0trak", 8);
m4af_write_tkhd_box(ctx, track_idx);
if ((ctx->priming_mode & M4AF_PRIMING_MODE_EDTS) &&
(track->encoder_delay || track->padding))
m4af_write_edts_box(ctx, track_idx);
m4af_write_mdia_box(ctx, track_idx);
m4af_update_box_size(ctx, pos);
}
static
int64_t m4af_movie_duration(m4af_ctx_t *ctx)
{
int64_t movie_duration = 0;
unsigned i;
for (i = 0; i < ctx->num_tracks; ++i) {
double x = ctx->track[i].duration;
if (ctx->priming_mode & M4AF_PRIMING_MODE_EDTS)
x -= (ctx->track[i].encoder_delay + ctx->track[i].padding);
int64_t duration = x / ctx->track[i].timescale * ctx->timescale + .5;
if (duration > movie_duration)
movie_duration = duration;
}
return movie_duration;
}
static
void m4af_write_mvhd_box(m4af_ctx_t *ctx)
{
int64_t pos = m4af_tell(ctx);
int64_t movie_duration = m4af_movie_duration(ctx);
uint8_t version = (ctx->creation_time > UINT32_MAX ||
ctx->modification_time > UINT32_MAX ||
movie_duration > UINT32_MAX);
m4af_write(ctx, "\0\0\0\0mvhd", 8);
m4af_write(ctx, &version, 1);
m4af_write(ctx, "\0\0\0", 3); /* flags */
if (version) {
m4af_write64(ctx, ctx->creation_time);
m4af_write64(ctx, ctx->modification_time);
m4af_write32(ctx, ctx->timescale);
m4af_write64(ctx, movie_duration);
} else {
m4af_write32(ctx, ctx->creation_time);
m4af_write32(ctx, ctx->modification_time);
m4af_write32(ctx, ctx->timescale);
m4af_write32(ctx, movie_duration);
}
m4af_write(ctx,
"\0\001\0\0" /* rate: 1.0 */
"\001\0" /* volume: 1.0 */
"\0\0" /* reserved */
"\0\0\0\0" /* reserved[0] */
"\0\0\0\0" /* reserved[1] */
"\0\001\0\0" /* matrix[0] */
"\0\0\0\0" /* matrix[1] */
"\0\0\0\0" /* matrix[2] */
"\0\0\0\0" /* matrix[3] */
"\0\001\0\0" /* matrix[4] */
"\0\0\0\0" /* matrix[5] */
"\0\0\0\0" /* matrix[6] */
"\0\0\0\0" /* matrix[7] */
"\100\0\0\0" /* matrix[8] */
"\0\0\0\0" /* pre_defined[0] */
"\0\0\0\0" /* pre_defined[1] */
"\0\0\0\0" /* pre_defined[2] */
"\0\0\0\0" /* pre_defined[3] */
"\0\0\0\0" /* pre_defined[4] */
"\0\0\0\0" /* pre_defined[5] */
, 76);
m4af_write32(ctx, ctx->num_tracks + 1);
m4af_update_box_size(ctx, pos);
}
static
void m4af_write_mean_box(m4af_ctx_t *ctx)
{
m4af_write(ctx,
"\0\0\0\034" /* size */
"mean"
"\0" /* version */
"\0\0\0" /* flags */
"com.apple.iTunes" /* meaning-string */
, 28);
}
static
void m4af_write_name_box(m4af_ctx_t *ctx, const char *name)
{
int64_t pos = m4af_tell(ctx);
m4af_write(ctx,
"\0\0\0\0" /* size */
"name" /* type */
"\0" /* version */
"\0\0\0" /* flags */
, 12);
m4af_write(ctx, name, strlen(name));
m4af_update_box_size(ctx, pos);
}
static
void m4af_write_data_box(m4af_ctx_t *ctx, uint32_t type_code,
const char *data, uint32_t data_size)
{
int64_t pos = m4af_tell(ctx);
uint8_t code = type_code;
m4af_write(ctx,
"\0\0\0\0" /* size */
"data" /* type */
"\0\0" /* reserved */
"\0" /* type_set_indifier */
,11);
m4af_write(ctx, &code, 1);
m4af_write(ctx, "\0\0\0\0", 4); /* locale */
m4af_write(ctx, data, data_size);
m4af_update_box_size(ctx, pos);
}
static
void m4af_write_metadata(m4af_ctx_t *ctx, m4af_itmf_entry_t *entry)
{
int64_t pos = m4af_tell(ctx);
m4af_write(ctx, "\0\0\0\0", 4);
m4af_write32(ctx, entry->fcc);
if (entry->fcc != M4AF_FOURCC('-','-','-','-'))
m4af_write_data_box(ctx, entry->type_code,
entry->data, entry->data_size);
else {
m4af_write_mean_box(ctx);
m4af_write_name_box(ctx, entry->name);
m4af_write_data_box(ctx, 1, entry->data, entry->data_size);
}
m4af_update_box_size(ctx, pos);
}
static
void m4af_write_ilst_box(m4af_ctx_t *ctx)
{
uint32_t i;
int64_t pos = m4af_tell(ctx);
m4af_write(ctx, "\0\0\0\0ilst", 8);
for (i = 0; i < ctx->num_tags; ++i)
m4af_write_metadata(ctx, &ctx->itmf_table[i]);
m4af_update_box_size(ctx, pos);
}
static
void m4af_write_meta_box(m4af_ctx_t *ctx)
{
int64_t pos = m4af_tell(ctx);
m4af_write(ctx,
"\0\0\0\0" /* size */
"meta" /* type */
"\0" /* version */
"\0\0\0" /* flags */
, 12);
m4af_write_hdlr_box(ctx, 0, "mdir");
m4af_write_ilst_box(ctx);
m4af_update_box_size(ctx, pos);
}
static
void m4af_write_udta_box(m4af_ctx_t *ctx)
{
int64_t pos = m4af_tell(ctx);
m4af_write(ctx, "\0\0\0\0udta", 8);
m4af_write_meta_box(ctx);
m4af_update_box_size(ctx, pos);
}
static
uint32_t m4af_write_moov_box(m4af_ctx_t *ctx)
{
unsigned i;
int64_t pos = m4af_tell(ctx);
m4af_write(ctx, "\0\0\0\0moov", 8);
m4af_write_mvhd_box(ctx);
for (i = 0; i < ctx->num_tracks; ++i)
m4af_write_trak_box(ctx, i);
if (ctx->num_tags)
m4af_write_udta_box(ctx);
return m4af_update_box_size(ctx, pos);
}
static
void m4af_finalize_mdat(m4af_ctx_t *ctx)
{
if (ctx->mdat_size + 8 > UINT32_MAX) {
m4af_set_pos(ctx, ctx->mdat_pos - 16);
m4af_write32(ctx, 1);
m4af_write(ctx, "mdat", 4);
m4af_write64(ctx, ctx->mdat_size + 16);
} else {
m4af_set_pos(ctx, ctx->mdat_pos - 8);
m4af_write32(ctx, ctx->mdat_size + 8);
}
m4af_set_pos(ctx, ctx->mdat_pos + ctx->mdat_size);
}
static
uint64_t m4af_patch_moov(m4af_ctx_t *ctx, uint32_t moov_size, uint32_t offset)
{
int64_t pos = 0;
uint32_t moov_size2;
int i, j;
m4af_io_callbacks_t io_reserve = ctx->io;
void *io_cookie_reserve = ctx->io_cookie;
for (i = 0; i < ctx->num_tracks; ++i)
for (j = 0; j < ctx->track[i].num_chunks; ++j)
ctx->track[i].chunk_table[j].offset += offset;
ctx->io = m4af_null_io_callbacks;
ctx->io_cookie = &pos;
moov_size2 = m4af_write_moov_box(ctx);
if (moov_size2 != moov_size) {
/* stco -> co64 switching */
for (i = 0; i < ctx->num_tracks; ++i)
for (j = 0; j < ctx->track[i].num_chunks; ++j)
ctx->track[i].chunk_table[j].offset += moov_size2 - moov_size;
moov_size2 = m4af_write_moov_box(ctx);
}
ctx->io = io_reserve;
ctx->io_cookie = io_cookie_reserve;
return moov_size2;
}
static
void m4af_shift_mdat_pos(m4af_ctx_t *ctx, uint32_t offset)
{
int64_t begin, end;
char *buf;
buf = malloc(1024*1024*2);
end = ctx->mdat_pos + ctx->mdat_size;
for (; (begin = m4af_max(ctx->mdat_pos, end - 1024*1024*2)) < end;
end = begin) {
m4af_set_pos(ctx, begin);
ctx->io.read(ctx->io_cookie, buf, end - begin);
m4af_set_pos(ctx, begin + offset);
m4af_write(ctx, buf, end - begin);
}
ctx->mdat_pos += offset;
m4af_set_pos(ctx, ctx->mdat_pos - 16);
m4af_write_free_box(ctx, 0);
m4af_write(ctx, "\0\0\0\0mdat", 8);
m4af_finalize_mdat(ctx);
free(buf);
}
int m4af_finalize(m4af_ctx_t *ctx, int optimize)
{
unsigned i;
m4af_track_t *track;
uint32_t moov_size;
for (i = 0; i < ctx->num_tracks; ++i) {
track = ctx->track + i;
if (track->duration) {
int64_t track_size = 0;
unsigned j;
for (j = 0; j < track->num_chunks; ++j)
track_size += track->chunk_table[j].size;
track->avgBitrate =
8.0 * track_size * track->timescale / track->duration + .5;
}
m4af_flush_chunk(ctx, i);
}
track = ctx->track;
if ((ctx->priming_mode & M4AF_PRIMING_MODE_ITUNSMPB) &&
(track->encoder_delay || track->padding))
m4af_set_iTunSMPB(ctx);
m4af_finalize_mdat(ctx);
moov_size = m4af_write_moov_box(ctx);
if (optimize) {
int64_t pos;
uint32_t moov_size2 = m4af_patch_moov(ctx, moov_size, moov_size + 1024);
m4af_shift_mdat_pos(ctx, moov_size2 + 1024);
m4af_set_pos(ctx, 32);
m4af_write_moov_box(ctx);
pos = m4af_tell(ctx);
m4af_write_free_box(ctx, ctx->mdat_pos - pos - 24);
}
return ctx->last_error;
}
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