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SoftwareEngineering/直播工具包/nginx-rtmp-module-master/dash/ngx_rtmp_mp4.c

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配置
5 years ago
#include <ngx_config.h>
#include <ngx_core.h>
#include "ngx_rtmp_mp4.h"
#include <ngx_rtmp_codec_module.h>
static ngx_int_t
ngx_rtmp_mp4_field_32(ngx_buf_t *b, uint32_t n)
{
u_char bytes[4];
bytes[0] = ((uint32_t) n >> 24) & 0xFF;
bytes[1] = ((uint32_t) n >> 16) & 0xFF;
bytes[2] = ((uint32_t) n >> 8) & 0xFF;
bytes[3] = (uint32_t) n & 0xFF;
if (b->last + sizeof(bytes) > b->end) {
return NGX_ERROR;
}
b->last = ngx_cpymem(b->last, bytes, sizeof(bytes));
return NGX_OK;
}
static ngx_int_t
ngx_rtmp_mp4_field_24(ngx_buf_t *b, uint32_t n)
{
u_char bytes[3];
bytes[0] = ((uint32_t) n >> 16) & 0xFF;
bytes[1] = ((uint32_t) n >> 8) & 0xFF;
bytes[2] = (uint32_t) n & 0xFF;
if (b->last + sizeof(bytes) > b->end) {
return NGX_ERROR;
}
b->last = ngx_cpymem(b->last, bytes, sizeof(bytes));
return NGX_OK;
}
static ngx_int_t
ngx_rtmp_mp4_field_16(ngx_buf_t *b, uint16_t n)
{
u_char bytes[2];
bytes[0] = ((uint32_t) n >> 8) & 0xFF;
bytes[1] = (uint32_t) n & 0xFF;
if (b->last + sizeof(bytes) > b->end) {
return NGX_ERROR;
}
b->last = ngx_cpymem(b->last, bytes, sizeof(bytes));
return NGX_OK;
}
static ngx_int_t
ngx_rtmp_mp4_field_8(ngx_buf_t *b, uint8_t n)
{
u_char bytes[1];
bytes[0] = n & 0xFF;
if (b->last + sizeof(bytes) > b->end) {
return NGX_ERROR;
}
b->last = ngx_cpymem(b->last, bytes, sizeof(bytes));
return NGX_OK;
}
static ngx_int_t
ngx_rtmp_mp4_put_descr(ngx_buf_t *b, int tag, size_t size)
{
ngx_rtmp_mp4_field_8(b, (uint8_t) tag);
ngx_rtmp_mp4_field_8(b, size & 0x7F);
return NGX_OK;
}
static ngx_int_t
ngx_rtmp_mp4_data(ngx_buf_t *b, void *data, size_t n)
{
if (b->last + n > b->end) {
return NGX_ERROR;
}
b->last = ngx_cpymem(b->last, (u_char *) data, n);
return NGX_OK;
}
static ngx_int_t
ngx_rtmp_mp4_box(ngx_buf_t *b, const char box[4])
{
if (b->last + 4 > b->end) {
return NGX_ERROR;
}
b->last = ngx_cpymem(b->last, (u_char *) box, 4);
return NGX_OK;
}
static u_char *
ngx_rtmp_mp4_start_box(ngx_buf_t *b, const char box[4])
{
u_char *p;
p = b->last;
if (ngx_rtmp_mp4_field_32(b, 0) != NGX_OK) {
return NULL;
}
if (ngx_rtmp_mp4_box(b, box) != NGX_OK) {
return NULL;
}
return p;
}
static ngx_int_t
ngx_rtmp_mp4_update_box_size(ngx_buf_t *b, u_char *p)
{
u_char *curpos;
if (p == NULL) {
return NGX_ERROR;
}
curpos = b->last;
b->last = p;
ngx_rtmp_mp4_field_32(b, (uint32_t) (curpos - p));
b->last = curpos;
return NGX_OK;
}
static ngx_int_t
ngx_rtmp_mp4_write_matrix(ngx_buf_t *buf, uint32_t a, uint32_t b, uint32_t c,
uint32_t d, uint32_t tx, uint32_t ty)
{
/*
* transformation matrix
* |a b u|
* |c d v|
* |tx ty w|
*/
ngx_rtmp_mp4_field_32(buf, a << 16); /* 16.16 format */
ngx_rtmp_mp4_field_32(buf, b << 16); /* 16.16 format */
ngx_rtmp_mp4_field_32(buf, 0); /* u in 2.30 format */
ngx_rtmp_mp4_field_32(buf, c << 16); /* 16.16 format */
ngx_rtmp_mp4_field_32(buf, d << 16); /* 16.16 format */
ngx_rtmp_mp4_field_32(buf, 0); /* v in 2.30 format */
ngx_rtmp_mp4_field_32(buf, tx << 16); /* 16.16 format */
ngx_rtmp_mp4_field_32(buf, ty << 16); /* 16.16 format */
ngx_rtmp_mp4_field_32(buf, 1 << 30); /* w in 2.30 format */
return NGX_OK;
}
ngx_int_t
ngx_rtmp_mp4_write_ftyp(ngx_buf_t *b)
{
u_char *pos;
pos = ngx_rtmp_mp4_start_box(b, "ftyp");
/* major brand */
ngx_rtmp_mp4_box(b, "iso6");
/* minor version */
ngx_rtmp_mp4_field_32(b, 1);
/* compatible brands */
ngx_rtmp_mp4_box(b, "isom");
ngx_rtmp_mp4_box(b, "iso6");
ngx_rtmp_mp4_box(b, "dash");
ngx_rtmp_mp4_update_box_size(b, pos);
return NGX_OK;
}
ngx_int_t
ngx_rtmp_mp4_write_styp(ngx_buf_t *b)
{
u_char *pos;
pos = ngx_rtmp_mp4_start_box(b, "styp");
/* major brand */
ngx_rtmp_mp4_box(b, "iso6");
/* minor version */
ngx_rtmp_mp4_field_32(b, 1);
/* compatible brands */
ngx_rtmp_mp4_box(b, "isom");
ngx_rtmp_mp4_box(b, "iso6");
ngx_rtmp_mp4_box(b, "dash");
ngx_rtmp_mp4_update_box_size(b, pos);
return NGX_OK;
}
static ngx_int_t
ngx_rtmp_mp4_write_mvhd(ngx_buf_t *b)
{
u_char *pos;
pos = ngx_rtmp_mp4_start_box(b, "mvhd");
/* version */
ngx_rtmp_mp4_field_32(b, 0);
/* creation time */
ngx_rtmp_mp4_field_32(b, 0);
/* modification time */
ngx_rtmp_mp4_field_32(b, 0);
/* timescale */
ngx_rtmp_mp4_field_32(b, 1000);
/* duration */
ngx_rtmp_mp4_field_32(b, 0);
/* reserved */
ngx_rtmp_mp4_field_32(b, 0x00010000);
ngx_rtmp_mp4_field_16(b, 0x0100);
ngx_rtmp_mp4_field_16(b, 0);
ngx_rtmp_mp4_field_32(b, 0);
ngx_rtmp_mp4_field_32(b, 0);
ngx_rtmp_mp4_write_matrix(b, 1, 0, 0, 1, 0, 0);
/* reserved */
ngx_rtmp_mp4_field_32(b, 0);
ngx_rtmp_mp4_field_32(b, 0);
ngx_rtmp_mp4_field_32(b, 0);
ngx_rtmp_mp4_field_32(b, 0);
ngx_rtmp_mp4_field_32(b, 0);
ngx_rtmp_mp4_field_32(b, 0);
/* next track id */
ngx_rtmp_mp4_field_32(b, 1);
ngx_rtmp_mp4_update_box_size(b, pos);
return NGX_OK;
}
static ngx_int_t
ngx_rtmp_mp4_write_tkhd(ngx_rtmp_session_t *s, ngx_buf_t *b,
ngx_rtmp_mp4_track_type_t ttype)
{
u_char *pos;
ngx_rtmp_codec_ctx_t *codec_ctx;
codec_ctx = ngx_rtmp_get_module_ctx(s, ngx_rtmp_codec_module);
pos = ngx_rtmp_mp4_start_box(b, "tkhd");
/* version */
ngx_rtmp_mp4_field_8(b, 0);
/* flags: TrackEnabled */
ngx_rtmp_mp4_field_24(b, 0x0000000f);
/* creation time */
ngx_rtmp_mp4_field_32(b, 0);
/* modification time */
ngx_rtmp_mp4_field_32(b, 0);
/* track id */
ngx_rtmp_mp4_field_32(b, 1);
/* reserved */
ngx_rtmp_mp4_field_32(b, 0);
/* duration */
ngx_rtmp_mp4_field_32(b, 0);
/* reserved */
ngx_rtmp_mp4_field_32(b, 0);
ngx_rtmp_mp4_field_32(b, 0);
ngx_rtmp_mp4_field_32(b, 0);
/* reserved */
ngx_rtmp_mp4_field_16(b, ttype == NGX_RTMP_MP4_VIDEO_TRACK ? 0 : 0x0100);
/* reserved */
ngx_rtmp_mp4_field_16(b, 0);
ngx_rtmp_mp4_write_matrix(b, 1, 0, 0, 1, 0, 0);
if (ttype == NGX_RTMP_MP4_VIDEO_TRACK) {
ngx_rtmp_mp4_field_32(b, (uint32_t) codec_ctx->width << 16);
ngx_rtmp_mp4_field_32(b, (uint32_t) codec_ctx->height << 16);
} else {
ngx_rtmp_mp4_field_32(b, 0);
ngx_rtmp_mp4_field_32(b, 0);
}
ngx_rtmp_mp4_update_box_size(b, pos);
return NGX_OK;
}
static ngx_int_t
ngx_rtmp_mp4_write_mdhd(ngx_buf_t *b)
{
u_char *pos;
pos = ngx_rtmp_mp4_start_box(b, "mdhd");
/* version */
ngx_rtmp_mp4_field_32(b, 0);
/* creation time */
ngx_rtmp_mp4_field_32(b, 0);
/* modification time */
ngx_rtmp_mp4_field_32(b, 0);
/* time scale*/
ngx_rtmp_mp4_field_32(b, 1000);
/* duration */
ngx_rtmp_mp4_field_32(b, 0);
/* lanuguage */
ngx_rtmp_mp4_field_16(b, 0x15C7);
/* reserved */
ngx_rtmp_mp4_field_16(b, 0);
ngx_rtmp_mp4_update_box_size(b, pos);
return NGX_OK;
}
static ngx_int_t
ngx_rtmp_mp4_write_hdlr(ngx_buf_t *b, ngx_rtmp_mp4_track_type_t ttype)
{
u_char *pos;
pos = ngx_rtmp_mp4_start_box(b, "hdlr");
/* version and flags */
ngx_rtmp_mp4_field_32(b, 0);
/* pre defined */
ngx_rtmp_mp4_field_32(b, 0);
if (ttype == NGX_RTMP_MP4_VIDEO_TRACK) {
ngx_rtmp_mp4_box(b, "vide");
} else {
ngx_rtmp_mp4_box(b, "soun");
}
/* reserved */
ngx_rtmp_mp4_field_32(b, 0);
ngx_rtmp_mp4_field_32(b, 0);
ngx_rtmp_mp4_field_32(b, 0);
if (ttype == NGX_RTMP_MP4_VIDEO_TRACK) {
/* video handler string, NULL-terminated */
ngx_rtmp_mp4_data(b, "VideoHandler", sizeof("VideoHandler"));
} else {
/* sound handler string, NULL-terminated */
ngx_rtmp_mp4_data(b, "SoundHandler", sizeof("SoundHandler"));
}
ngx_rtmp_mp4_update_box_size(b, pos);
return NGX_OK;
}
static ngx_int_t
ngx_rtmp_mp4_write_vmhd(ngx_buf_t *b)
{
/* size is always 20, apparently */
ngx_rtmp_mp4_field_32(b, 20);
ngx_rtmp_mp4_box(b, "vmhd");
/* version and flags */
ngx_rtmp_mp4_field_32(b, 0x01);
/* reserved (graphics mode=copy) */
ngx_rtmp_mp4_field_32(b, 0);
ngx_rtmp_mp4_field_32(b, 0);
return NGX_OK;
}
static ngx_int_t
ngx_rtmp_mp4_write_smhd(ngx_buf_t *b)
{
/* size is always 16, apparently */
ngx_rtmp_mp4_field_32(b, 16);
ngx_rtmp_mp4_box(b, "smhd");
/* version and flags */
ngx_rtmp_mp4_field_32(b, 0);
/* reserved (balance normally=0) */
ngx_rtmp_mp4_field_16(b, 0);
ngx_rtmp_mp4_field_16(b, 0);
return NGX_OK;
}
static ngx_int_t
ngx_rtmp_mp4_write_dref(ngx_buf_t *b)
{
u_char *pos;
pos = ngx_rtmp_mp4_start_box(b, "dref");
/* version and flags */
ngx_rtmp_mp4_field_32(b, 0);
/* entry count */
ngx_rtmp_mp4_field_32(b, 1);
/* url size */
ngx_rtmp_mp4_field_32(b, 0xc);
ngx_rtmp_mp4_box(b, "url ");
/* version and flags */
ngx_rtmp_mp4_field_32(b, 0x00000001);
ngx_rtmp_mp4_update_box_size(b, pos);
return NGX_OK;
}
static ngx_int_t
ngx_rtmp_mp4_write_dinf(ngx_buf_t *b)
{
u_char *pos;
pos = ngx_rtmp_mp4_start_box(b, "dinf");
ngx_rtmp_mp4_write_dref(b);
ngx_rtmp_mp4_update_box_size(b, pos);
return NGX_OK;
}
static ngx_int_t
ngx_rtmp_mp4_write_avcc(ngx_rtmp_session_t *s, ngx_buf_t *b)
{
u_char *pos, *p;
ngx_chain_t *in;
ngx_rtmp_codec_ctx_t *codec_ctx;
codec_ctx = ngx_rtmp_get_module_ctx(s, ngx_rtmp_codec_module);
if (codec_ctx == NULL) {
return NGX_ERROR;
}
in = codec_ctx->avc_header;
if (in == NULL) {
return NGX_ERROR;
}
pos = ngx_rtmp_mp4_start_box(b, "avcC");
/* assume config fits one chunk (highly probable) */
/*
* Skip:
* - flv fmt
* - H264 CONF/PICT (0x00)
* - 0
* - 0
* - 0
*/
p = in->buf->pos + 5;
if (p < in->buf->last) {
ngx_rtmp_mp4_data(b, p, (size_t) (in->buf->last - p));
} else {
ngx_log_error(NGX_LOG_ERR, s->connection->log, ngx_errno,
"dash: invalid avcc received");
}
ngx_rtmp_mp4_update_box_size(b, pos);
return NGX_OK;
}
static ngx_int_t
ngx_rtmp_mp4_write_video(ngx_rtmp_session_t *s, ngx_buf_t *b)
{
u_char *pos;
ngx_rtmp_codec_ctx_t *codec_ctx;
codec_ctx = ngx_rtmp_get_module_ctx(s, ngx_rtmp_codec_module);
pos = ngx_rtmp_mp4_start_box(b, "avc1");
/* reserved */
ngx_rtmp_mp4_field_32(b, 0);
ngx_rtmp_mp4_field_16(b, 0);
/* data reference index */
ngx_rtmp_mp4_field_16(b, 1);
/* codec stream version & revision */
ngx_rtmp_mp4_field_16(b, 0);
ngx_rtmp_mp4_field_16(b, 0);
/* reserved */
ngx_rtmp_mp4_field_32(b, 0);
ngx_rtmp_mp4_field_32(b, 0);
ngx_rtmp_mp4_field_32(b, 0);
/* width & height */
ngx_rtmp_mp4_field_16(b, (uint16_t) codec_ctx->width);
ngx_rtmp_mp4_field_16(b, (uint16_t) codec_ctx->height);
/* horizontal & vertical resolutions 72 dpi */
ngx_rtmp_mp4_field_32(b, 0x00480000);
ngx_rtmp_mp4_field_32(b, 0x00480000);
/* data size */
ngx_rtmp_mp4_field_32(b, 0);
/* frame count */
ngx_rtmp_mp4_field_16(b, 1);
/* compressor name */
ngx_rtmp_mp4_field_32(b, 0);
ngx_rtmp_mp4_field_32(b, 0);
ngx_rtmp_mp4_field_32(b, 0);
/* reserved */
ngx_rtmp_mp4_field_32(b, 0);
ngx_rtmp_mp4_field_32(b, 0);
ngx_rtmp_mp4_field_32(b, 0);
ngx_rtmp_mp4_field_32(b, 0);
ngx_rtmp_mp4_field_32(b, 0);
ngx_rtmp_mp4_field_16(b, 0x18);
ngx_rtmp_mp4_field_16(b, 0xffff);
ngx_rtmp_mp4_write_avcc(s, b);
ngx_rtmp_mp4_update_box_size(b, pos);
return NGX_OK;
}
static ngx_int_t
ngx_rtmp_mp4_write_esds(ngx_rtmp_session_t *s, ngx_buf_t *b)
{
size_t dsi_len;
u_char *pos, *dsi;
ngx_buf_t *db;
ngx_rtmp_codec_ctx_t *codec_ctx;
codec_ctx = ngx_rtmp_get_module_ctx(s, ngx_rtmp_codec_module);
if (codec_ctx == NULL || codec_ctx->aac_header == NULL) {
return NGX_ERROR;
}
db = codec_ctx->aac_header->buf;
if (db == NULL) {
return NGX_ERROR;
}
dsi = db->pos + 2;
if (dsi > db->last) {
return NGX_ERROR;
}
dsi_len = db->last - dsi;
pos = ngx_rtmp_mp4_start_box(b, "esds");
/* version */
ngx_rtmp_mp4_field_32(b, 0);
/* ES Descriptor */
ngx_rtmp_mp4_put_descr(b, 0x03, 23 + dsi_len);
/* ES_ID */
ngx_rtmp_mp4_field_16(b, 1);
/* flags */
ngx_rtmp_mp4_field_8(b, 0);
/* DecoderConfig Descriptor */
ngx_rtmp_mp4_put_descr(b, 0x04, 15 + dsi_len);
/* objectTypeIndication: Audio ISO/IEC 14496-3 (AAC) */
ngx_rtmp_mp4_field_8(b, 0x40);
/* streamType: AudioStream */
ngx_rtmp_mp4_field_8(b, 0x15);
/* bufferSizeDB */
ngx_rtmp_mp4_field_24(b, 0);
/* maxBitrate */
ngx_rtmp_mp4_field_32(b, 0x0001F151);
/* avgBitrate */
ngx_rtmp_mp4_field_32(b, 0x0001F14D);
/* DecoderSpecificInfo Descriptor */
ngx_rtmp_mp4_put_descr(b, 0x05, dsi_len);
ngx_rtmp_mp4_data(b, dsi, dsi_len);
/* SL Descriptor */
ngx_rtmp_mp4_put_descr(b, 0x06, 1);
ngx_rtmp_mp4_field_8(b, 0x02);
ngx_rtmp_mp4_update_box_size(b, pos);
return NGX_OK;
}
static ngx_int_t
ngx_rtmp_mp4_write_audio(ngx_rtmp_session_t *s, ngx_buf_t *b)
{
u_char *pos;
ngx_rtmp_codec_ctx_t *codec_ctx;
codec_ctx = ngx_rtmp_get_module_ctx(s, ngx_rtmp_codec_module);
pos = ngx_rtmp_mp4_start_box(b, "mp4a");
/* reserved */
ngx_rtmp_mp4_field_32(b, 0);
ngx_rtmp_mp4_field_16(b, 0);
/* data reference index */
ngx_rtmp_mp4_field_16(b, 1);
/* reserved */
ngx_rtmp_mp4_field_32(b, 0);
ngx_rtmp_mp4_field_32(b, 0);
/* channel count */
ngx_rtmp_mp4_field_16(b, (uint16_t) codec_ctx->audio_channels);
/* sample size */
ngx_rtmp_mp4_field_16(b, (uint16_t) (codec_ctx->sample_size * 8));
/* reserved */
ngx_rtmp_mp4_field_32(b, 0);
/* time scale */
ngx_rtmp_mp4_field_16(b, 1000);
/* sample rate */
ngx_rtmp_mp4_field_16(b, (uint16_t) codec_ctx->sample_rate);
ngx_rtmp_mp4_write_esds(s, b);
#if 0
/* tag size*/
ngx_rtmp_mp4_field_32(b, 8);
/* null tag */
ngx_rtmp_mp4_field_32(b, 0);
#endif
ngx_rtmp_mp4_update_box_size(b, pos);
return NGX_OK;
}
static ngx_int_t
ngx_rtmp_mp4_write_stsd(ngx_rtmp_session_t *s, ngx_buf_t *b,
ngx_rtmp_mp4_track_type_t ttype)
{
u_char *pos;
pos = ngx_rtmp_mp4_start_box(b, "stsd");
/* version & flags */
ngx_rtmp_mp4_field_32(b, 0);
/* entry count */
ngx_rtmp_mp4_field_32(b, 1);
if (ttype == NGX_RTMP_MP4_VIDEO_TRACK) {
ngx_rtmp_mp4_write_video(s, b);
} else {
ngx_rtmp_mp4_write_audio(s, b);
}
ngx_rtmp_mp4_update_box_size(b, pos);
return NGX_OK;
}
static ngx_int_t
ngx_rtmp_mp4_write_stts(ngx_buf_t *b)
{
u_char *pos;
pos = ngx_rtmp_mp4_start_box(b, "stts");
ngx_rtmp_mp4_field_32(b, 0); /* version */
ngx_rtmp_mp4_field_32(b, 0); /* entry count */
ngx_rtmp_mp4_update_box_size(b, pos);
return NGX_OK;
}
static ngx_int_t
ngx_rtmp_mp4_write_stsc(ngx_buf_t *b)
{
u_char *pos;
pos = ngx_rtmp_mp4_start_box(b, "stsc");
ngx_rtmp_mp4_field_32(b, 0); /* version */
ngx_rtmp_mp4_field_32(b, 0); /* entry count */
ngx_rtmp_mp4_update_box_size(b, pos);
return NGX_OK;
}
static ngx_int_t
ngx_rtmp_mp4_write_stsz(ngx_buf_t *b)
{
u_char *pos;
pos = ngx_rtmp_mp4_start_box(b, "stsz");
ngx_rtmp_mp4_field_32(b, 0); /* version */
ngx_rtmp_mp4_field_32(b, 0); /* entry count */
ngx_rtmp_mp4_field_32(b, 0); /* moar zeros */
ngx_rtmp_mp4_update_box_size(b, pos);
return NGX_OK;
}
static ngx_int_t
ngx_rtmp_mp4_write_stco(ngx_buf_t *b)
{
u_char *pos;
pos = ngx_rtmp_mp4_start_box(b, "stco");
ngx_rtmp_mp4_field_32(b, 0); /* version */
ngx_rtmp_mp4_field_32(b, 0); /* entry count */
ngx_rtmp_mp4_update_box_size(b, pos);
return NGX_OK;
}
static ngx_int_t
ngx_rtmp_mp4_write_stbl(ngx_rtmp_session_t *s, ngx_buf_t *b,
ngx_rtmp_mp4_track_type_t ttype)
{
u_char *pos;
pos = ngx_rtmp_mp4_start_box(b, "stbl");
ngx_rtmp_mp4_write_stsd(s, b, ttype);
ngx_rtmp_mp4_write_stts(b);
ngx_rtmp_mp4_write_stsc(b);
ngx_rtmp_mp4_write_stsz(b);
ngx_rtmp_mp4_write_stco(b);
ngx_rtmp_mp4_update_box_size(b, pos);
return NGX_OK;
}
static ngx_int_t
ngx_rtmp_mp4_write_minf(ngx_rtmp_session_t *s, ngx_buf_t *b,
ngx_rtmp_mp4_track_type_t ttype)
{
u_char *pos;
pos = ngx_rtmp_mp4_start_box(b, "minf");
if (ttype == NGX_RTMP_MP4_VIDEO_TRACK) {
ngx_rtmp_mp4_write_vmhd(b);
} else {
ngx_rtmp_mp4_write_smhd(b);
}
ngx_rtmp_mp4_write_dinf(b);
ngx_rtmp_mp4_write_stbl(s, b, ttype);
ngx_rtmp_mp4_update_box_size(b, pos);
return NGX_OK;
}
static ngx_int_t
ngx_rtmp_mp4_write_mdia(ngx_rtmp_session_t *s, ngx_buf_t *b,
ngx_rtmp_mp4_track_type_t ttype)
{
u_char *pos;
pos = ngx_rtmp_mp4_start_box(b, "mdia");
ngx_rtmp_mp4_write_mdhd(b);
ngx_rtmp_mp4_write_hdlr(b, ttype);
ngx_rtmp_mp4_write_minf(s, b, ttype);
ngx_rtmp_mp4_update_box_size(b, pos);
return NGX_OK;
}
static ngx_int_t
ngx_rtmp_mp4_write_trak(ngx_rtmp_session_t *s, ngx_buf_t *b,
ngx_rtmp_mp4_track_type_t ttype)
{
u_char *pos;
pos = ngx_rtmp_mp4_start_box(b, "trak");
ngx_rtmp_mp4_write_tkhd(s, b, ttype);
ngx_rtmp_mp4_write_mdia(s, b, ttype);
ngx_rtmp_mp4_update_box_size(b, pos);
return NGX_OK;
}
static ngx_int_t
ngx_rtmp_mp4_write_mvex(ngx_buf_t *b)
{
u_char *pos;
pos = ngx_rtmp_mp4_start_box(b, "mvex");
ngx_rtmp_mp4_field_32(b, 0x20);
ngx_rtmp_mp4_box(b, "trex");
/* version & flags */
ngx_rtmp_mp4_field_32(b, 0);
/* track id */
ngx_rtmp_mp4_field_32(b, 1);
/* default sample description index */
ngx_rtmp_mp4_field_32(b, 1);
/* default sample duration */
ngx_rtmp_mp4_field_32(b, 0);
/* default sample size, 1024 for AAC */
ngx_rtmp_mp4_field_32(b, 0);
/* default sample flags, key on */
ngx_rtmp_mp4_field_32(b, 0);
ngx_rtmp_mp4_update_box_size(b, pos);
return NGX_OK;
}
ngx_int_t
ngx_rtmp_mp4_write_moov(ngx_rtmp_session_t *s, ngx_buf_t *b,
ngx_rtmp_mp4_track_type_t ttype)
{
u_char *pos;
pos = ngx_rtmp_mp4_start_box(b, "moov");
ngx_rtmp_mp4_write_mvhd(b);
ngx_rtmp_mp4_write_mvex(b);
ngx_rtmp_mp4_write_trak(s, b, ttype);
ngx_rtmp_mp4_update_box_size(b, pos);
return NGX_OK;
}
static ngx_int_t
ngx_rtmp_mp4_write_tfhd(ngx_buf_t *b)
{
u_char *pos;
pos = ngx_rtmp_mp4_start_box(b, "tfhd");
/* version & flags */
ngx_rtmp_mp4_field_32(b, 0x00020000);
/* track id */
ngx_rtmp_mp4_field_32(b, 1);
ngx_rtmp_mp4_update_box_size(b, pos);
return NGX_OK;
}
static ngx_int_t
ngx_rtmp_mp4_write_tfdt(ngx_buf_t *b, uint32_t earliest_pres_time)
{
u_char *pos;
pos = ngx_rtmp_mp4_start_box(b, "tfdt");
/* version == 1 aka 64 bit integer */
ngx_rtmp_mp4_field_32(b, 0x00000000);
ngx_rtmp_mp4_field_32(b, earliest_pres_time);
ngx_rtmp_mp4_update_box_size(b, pos);
return NGX_OK;
}
static ngx_int_t
ngx_rtmp_mp4_write_trun(ngx_buf_t *b, uint32_t sample_count,
ngx_rtmp_mp4_sample_t *samples, ngx_uint_t sample_mask, u_char *moof_pos)
{
u_char *pos;
uint32_t i, offset, nitems, flags;
pos = ngx_rtmp_mp4_start_box(b, "trun");
nitems = 0;
/* data offset present */
flags = 0x01;
if (sample_mask & NGX_RTMP_MP4_SAMPLE_DURATION) {
nitems++;
flags |= 0x000100;
}
if (sample_mask & NGX_RTMP_MP4_SAMPLE_SIZE) {
nitems++;
flags |= 0x000200;
}
if (sample_mask & NGX_RTMP_MP4_SAMPLE_KEY) {
nitems++;
flags |= 0x000400;
}
if (sample_mask & NGX_RTMP_MP4_SAMPLE_DELAY) {
nitems++;
flags |= 0x000800;
}
offset = (pos - moof_pos) + 20 + (sample_count * nitems * 4) + 8;
ngx_rtmp_mp4_field_32(b, flags);
ngx_rtmp_mp4_field_32(b, sample_count);
ngx_rtmp_mp4_field_32(b, offset);
for (i = 0; i < sample_count; i++, samples++) {
if (sample_mask & NGX_RTMP_MP4_SAMPLE_DURATION) {
ngx_rtmp_mp4_field_32(b, samples->duration);
}
if (sample_mask & NGX_RTMP_MP4_SAMPLE_SIZE) {
ngx_rtmp_mp4_field_32(b, samples->size);
}
if (sample_mask & NGX_RTMP_MP4_SAMPLE_KEY) {
ngx_rtmp_mp4_field_32(b, samples->key ? 0x00000000 : 0x00010000);
}
if (sample_mask & NGX_RTMP_MP4_SAMPLE_DELAY) {
ngx_rtmp_mp4_field_32(b, samples->delay);
}
}
ngx_rtmp_mp4_update_box_size(b, pos);
return NGX_OK;
}
static ngx_int_t
ngx_rtmp_mp4_write_traf(ngx_buf_t *b, uint32_t earliest_pres_time,
uint32_t sample_count, ngx_rtmp_mp4_sample_t *samples,
ngx_uint_t sample_mask, u_char *moof_pos)
{
u_char *pos;
pos = ngx_rtmp_mp4_start_box(b, "traf");
ngx_rtmp_mp4_write_tfhd(b);
ngx_rtmp_mp4_write_tfdt(b, earliest_pres_time);
ngx_rtmp_mp4_write_trun(b, sample_count, samples, sample_mask, moof_pos);
ngx_rtmp_mp4_update_box_size(b, pos);
return NGX_OK;
}
static ngx_int_t
ngx_rtmp_mp4_write_mfhd(ngx_buf_t *b, uint32_t index)
{
u_char *pos;
pos = ngx_rtmp_mp4_start_box(b, "mfhd");
/* don't know what this is */
ngx_rtmp_mp4_field_32(b, 0);
/* fragment index. */
ngx_rtmp_mp4_field_32(b, index);
ngx_rtmp_mp4_update_box_size(b, pos);
return NGX_OK;
}
ngx_int_t
ngx_rtmp_mp4_write_sidx(ngx_buf_t *b, ngx_uint_t reference_size,
uint32_t earliest_pres_time, uint32_t latest_pres_time)
{
u_char *pos;
uint32_t duration;
duration = latest_pres_time - earliest_pres_time;
pos = ngx_rtmp_mp4_start_box(b, "sidx");
/* version */
ngx_rtmp_mp4_field_32(b, 0);
/* reference id */
ngx_rtmp_mp4_field_32(b, 1);
/* timescale */
ngx_rtmp_mp4_field_32(b, 1000);
/* earliest presentation time */
ngx_rtmp_mp4_field_32(b, earliest_pres_time);
/* first offset */
ngx_rtmp_mp4_field_32(b, duration); /*TODO*/
/* reserved */
ngx_rtmp_mp4_field_16(b, 0);
/* reference count = 1 */
ngx_rtmp_mp4_field_16(b, 1);
/* 1st bit is reference type, the rest is reference size */
ngx_rtmp_mp4_field_32(b, reference_size);
/* subsegment duration */
ngx_rtmp_mp4_field_32(b, duration);
/* first bit is startsWithSAP (=1), next 3 bits are SAP type (=001) */
ngx_rtmp_mp4_field_8(b, 0x90);
/* SAP delta time */
ngx_rtmp_mp4_field_24(b, 0);
ngx_rtmp_mp4_update_box_size(b, pos);
return NGX_OK;
}
ngx_int_t
ngx_rtmp_mp4_write_moof(ngx_buf_t *b, uint32_t earliest_pres_time,
uint32_t sample_count, ngx_rtmp_mp4_sample_t *samples,
ngx_uint_t sample_mask, uint32_t index)
{
u_char *pos;
pos = ngx_rtmp_mp4_start_box(b, "moof");
ngx_rtmp_mp4_write_mfhd(b, index);
ngx_rtmp_mp4_write_traf(b, earliest_pres_time, sample_count, samples,
sample_mask, pos);
ngx_rtmp_mp4_update_box_size(b, pos);
return NGX_OK;
}
ngx_uint_t
ngx_rtmp_mp4_write_mdat(ngx_buf_t *b, ngx_uint_t size)
{
ngx_rtmp_mp4_field_32(b, size);
ngx_rtmp_mp4_box(b, "mdat");
return NGX_OK;
}