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FS-7519: add fs_avc_find_startcode

This commit is contained in:
Seven Du 2015-05-19 07:40:01 +08:00 committed by Michael Jerris
parent 3e1b5cf355
commit 79741a307d
1 changed files with 49 additions and 1 deletions
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50
src/mod/codecs/mod_avcodec/mod_avcodec.c
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@ -59,6 +59,47 @@ SWITCH_MODULE_DEFINITION(mod_avcodec, mod_avcodec_load, NULL, NULL);
const uint8_t *ff_avc_find_startcode(const uint8_t *p, const uint8_t *end);
static const uint8_t *fs_avc_find_startcode_internal(const uint8_t *p, const uint8_t *end)
{
const uint8_t *a = p + 4 - ((intptr_t)p & 3);
for (end -= 3; p < a && p < end; p++) {
if (p[0] == 0 && p[1] == 0 && p[2] == 1)
return p;
}
for (end -= 3; p < end; p += 4) {
uint32_t x = *(const uint32_t*)p;
if ((x - 0x01010101) & (~x) & 0x80808080) {
if (p[1] == 0) {
if (p[0] == 0 && p[2] == 1)
return p;
if (p[2] == 0 && p[3] == 1)
return p+1;
}
if (p[3] == 0) {
if (p[2] == 0 && p[4] == 1)
return p+2;
if (p[4] == 0 && p[5] == 1)
return p+3;
}
}
}
for (end += 3; p < end; p++) {
if (p[0] == 0 && p[1] == 0 && p[2] == 1)
return p;
}
return end + 3;
}
const uint8_t *fs_avc_find_startcode(const uint8_t *p, const uint8_t *end){
const uint8_t *out= fs_avc_find_startcode_internal(p, end);
if(p<out && out<end && !out[-1]) out--;
return out;
}
/* codec interface */
@ -593,10 +634,12 @@ process:
const uint8_t *p = pkt->data;
int i = 0;
switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_DEBUG1, "Encoded frame %lu (size=%5d) nalu_type=0x%x %d\n", context->pts, pkt->size, *((uint8_t *)pkt->data +4), *got_output);
/* split into nalus */
memset(context->nalus, 0, sizeof(context->nalus));
while ((p = ff_avc_find_startcode(p, pkt->data+pkt->size)) < (pkt->data + pkt->size)) {
while ((p = fs_avc_find_startcode(p, pkt->data+pkt->size)) < (pkt->data + pkt->size)) {
if (!context->nalus[i].start) {
while (!(*p++)) ; /* eat the sync bytes, what ever 0 0 1 or 0 0 0 1 */
context->nalus[i].start = p;
@ -616,6 +659,11 @@ process:
return consume_nalu(context, frame);
}
if (context->encoder_avframe) { //quick code to avoice internal refs
av_frame_free(&context->encoder_avframe);
context->encoder_avframe = NULL;
}
error:
frame->datalen = 0;
return SWITCH_STATUS_FALSE;