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fixed AAC header parser

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This commit is contained in:
Roman Arutyunyan 2012-10-13 09:28:35 +04:00
parent 5cd5f83d8d
commit 5aac8b5cb3
1 changed files with 44 additions and 7 deletions
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51
ngx_rtmp_codec_module.c
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@ -158,7 +158,8 @@ ngx_rtmp_codec_av(ngx_rtmp_session_t *s, ngx_rtmp_header_t *h,
ngx_chain_t **header, **pheader;
uint8_t fmt;
ngx_rtmp_header_t ch, lh;
ngx_uint_t *version;
ngx_uint_t *version, idx;
u_char *p;
static ngx_uint_t sample_rates[] =
{ 5512, 11025, 22050, 44100 };
@ -216,12 +217,48 @@ ngx_rtmp_codec_av(ngx_rtmp_session_t *s, ngx_rtmp_header_t *h,
pheader = &ctx->aac_pheader;
version = &ctx->aac_version;
/* 1 byte RTMP audio header
* 1 byte AAC conf/data
* 3 bytes until 18-22 bits of AAC header */
if (in->buf->last - in->buf->pos >= 5) {
ctx->aac_sample_rate = aac_sample_rates[
(in->buf->pos[4] >> 2) & 0xf];
if (in->buf->last - in->buf->pos > 3) {
p = in->buf->pos + 2;
/* MPEG-4 Audio Specific Config
5 bits: object type
if (object type == 31)
6 bits + 32: object type
--->4 bits: frequency index
if (frequency index == 15)
24 bits: frequency
4 bits: channel configuration
var bits: AOT Specific Config
*/
if ((p[0] >> 3) == 0x1f) {
idx = (p[1] >> 1) & 0x0f;
} else {
idx = ((p[0] << 1) & 0x0f) | (p[1] >> 7);
}
#ifdef NGX_DEBUG
{
u_char buf[256], *p, *pp;
u_char hex[] = "01234567890abcdef";
for (pp = buf, p = in->buf->pos;
p < in->buf->last && pp < buf + sizeof(buf) - 1;
++p)
{
*pp++ = hex[*p >> 4];
*pp++ = hex[*p & 0x0f];
}
*pp = 0;
ngx_log_debug1(NGX_LOG_DEBUG_RTMP, s->connection->log, 0,
"codec: AAC header: %s", buf);
}
#endif
ctx->aac_sample_rate = aac_sample_rates[idx];
ctx->sample_rate = ctx->aac_sample_rate;
}