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00020
00021 #include "avformat.h"
00022 #include "rtp_aac.h"
00023 #include "rtp_internal.h"
00024
00025 #define MAX_FRAMES_PER_PACKET (s->max_frames_per_packet ? s->max_frames_per_packet : 5)
00026 #define MAX_AU_HEADERS_SIZE (2 + 2 * MAX_FRAMES_PER_PACKET)
00027
00028 void ff_rtp_send_aac(AVFormatContext *s1, const uint8_t *buff, int size)
00029 {
00030 RTPDemuxContext *s = s1->priv_data;
00031 int len, max_packet_size;
00032 uint8_t *p;
00033
00034
00035 if ((s1->streams[0]->codec->extradata_size) == 0) {
00036 size -= 7;
00037 buff += 7;
00038 }
00039 max_packet_size = s->max_payload_size - MAX_AU_HEADERS_SIZE;
00040
00041
00042 len = (s->buf_ptr - s->buf);
00043 if ((s->read_buf_index == MAX_FRAMES_PER_PACKET) || (len && (len + size) > max_packet_size)) {
00044 int au_size = s->read_buf_index * 2;
00045
00046 p = s->buf + MAX_AU_HEADERS_SIZE - au_size - 2;
00047 if (p != s->buf) {
00048 memmove(p + 2, s->buf + 2, au_size);
00049 }
00050
00051 p[0] = ((au_size * 8) & 0xFF) >> 8;
00052 p[1] = (au_size * 8) & 0xFF;
00053
00054 ff_rtp_send_data(s1, p, s->buf_ptr - p, 1);
00055
00056 s->read_buf_index = 0;
00057 }
00058 if (s->read_buf_index == 0) {
00059 s->buf_ptr = s->buf + MAX_AU_HEADERS_SIZE;
00060 s->timestamp = s->cur_timestamp;
00061 }
00062
00063 if (size < max_packet_size) {
00064 p = s->buf + s->read_buf_index++ * 2 + 2;
00065 *p++ = size >> 5;
00066 *p = (size & 0x1F) << 3;
00067 memcpy(s->buf_ptr, buff, size);
00068 s->buf_ptr += size;
00069 } else {
00070 if (s->buf_ptr != s->buf + MAX_AU_HEADERS_SIZE) {
00071 av_log(s1, AV_LOG_ERROR, "Strange...\n");
00072 av_abort();
00073 }
00074 max_packet_size = s->max_payload_size - 4;
00075 p = s->buf;
00076 p[0] = 0;
00077 p[1] = 16;
00078 while (size > 0) {
00079 len = FFMIN(size, max_packet_size);
00080 p[2] = len >> 5;
00081 p[3] = (size & 0x1F) << 3;
00082 memcpy(p + 4, buff, len);
00083 ff_rtp_send_data(s1, p, len + 4, len == size);
00084 size -= len;
00085 buff += len;
00086 }
00087 }
00088 }