101 lines
3.3 KiB
C++
101 lines
3.3 KiB
C++
// RFC6184 RTP Payload Format for H.264 Video
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#include "mpeg4-avc.h"
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#include "sdp-payload.h"
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#include "base64.h"
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#include <stdio.h>
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#include <stdint.h>
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#include <stdlib.h>
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#include <string.h>
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#include <assert.h>
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#include <errno.h>
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int sdp_h264(uint8_t *data, int bytes, const char* proto, unsigned short port, int payload, int frequence, const void* extra, int extra_size)
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{
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static const char* pattern =
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"m=video %hu %s %d\r\n"
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"a=rtpmap:%d H264/90000\r\n"
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"a=fmtp:%d packetization-mode=1;profile-level-id=%02X%02X%02X;sprop-parameter-sets=";
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int r, n;
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uint8_t i;
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struct mpeg4_avc_t avc;
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assert(90000 == frequence);
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r = mpeg4_avc_decoder_configuration_record_load((const uint8_t*)extra, extra_size, &avc);
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if (r < 0) return r;
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assert(avc.nb_pps + avc.nb_sps > 0);
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n = snprintf((char*)data, bytes, pattern, port, proto && *proto ? proto : "RTP/AVP", payload, payload, payload,
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(unsigned int)avc.profile, (unsigned int)avc.compatibility, (unsigned int)avc.level);
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for (i = 0; i < avc.nb_sps; i++)
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{
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if (n + 1 + avc.sps[i].bytes * 2 > bytes)
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return -ENOMEM; // // don't have enough memory
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if (i > 0 && n < bytes) data[n++] = ',';
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n += (int)base64_encode((char*)data + n, avc.sps[i].data, avc.sps[i].bytes);
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}
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for (i = 0; i < avc.nb_pps; i++)
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{
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if (n + 1 + avc.pps[i].bytes * 2 > bytes)
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return -ENOMEM; // // don't have enough memory
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if (n < bytes) data[n++] = ',';
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n += (int)base64_encode((char*)data + n, avc.pps[i].data, avc.pps[i].bytes);
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}
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if (n + 2 > bytes)
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return -ENOMEM; // don't have enough memory
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data[n++] = '\r';
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data[n++] = '\n';
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return n;
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}
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int sdp_h264_load(uint8_t* data, int bytes, const char* config)
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{
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int n, len, off;
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const char* p, *next;
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const uint8_t startcode[] = { 0x00, 0x00, 0x00, 0x01 };
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off = 0;
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p = config;
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while (p)
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{
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next = strchr(p, ',');
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len = next ? (int)(next - p) : (int)strlen(p);
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if (off + (len + 3) / 4 * 3 + (int)sizeof(startcode) > bytes)
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return -ENOMEM; // don't have enough space
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memcpy(data + off, startcode, sizeof(startcode));
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n = (int)base64_decode(data + off + sizeof(startcode), p, len);
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assert(n <= (len + 3) / 4 * 3);
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off += n + sizeof(startcode);
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p = next ? next + 1 : NULL;
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}
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return off;
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}
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#if defined(_DEBUG) || defined(DEBUG)
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void sdp_h264_test(void)
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{
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const char* sdp = "m=video 0 RTP/AVP 96\r\na=rtpmap:96 H264/90000\r\na=fmtp:96 packetization-mode=1;profile-level-id=64001F;sprop-parameter-sets=Z2QAH6zZQFAFumoCGgKAAAADAIAAAB5HjBjL,aO+8sA==\r\n";
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const char* config = "Z2QAH6zZQFAFumoCGgKAAAADAIAAAB5HjBjL,aO+8sA==";
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static const uint8_t extra[] = { 0x01, 0x64, 0x00, 0x1f, 0xff, 0xe1, 0x00, 0x1b, 0x67, 0x64, 0x00, 0x1f, 0xac, 0xd9, 0x40, 0x50, 0x05, 0xba, 0x6a, 0x02, 0x1a, 0x02, 0x80, 0x00, 0x00, 0x03, 0x00, 0x80, 0x00, 0x00, 0x1e, 0x47, 0x8c, 0x18, 0xcb, 0x01, 0x00, 0x04, 0x68, 0xef, 0xbc, 0xb0 };
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static const uint8_t ps[] = { 0x00, 0x00, 0x00, 0x1, 0x67, 0x64, 0x00, 0x1f, 0xac, 0xd9, 0x40, 0x50, 0x05, 0xba, 0x6a, 0x02, 0x1a, 0x02, 0x80, 0x00, 0x00, 0x03, 0x00, 0x80, 0x00, 0x00, 0x1e, 0x47, 0x8c, 0x18, 0xcb, 0x00, 0x00, 0x00, 0x1, 0x68, 0xef, 0xbc, 0xb0 };
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uint8_t buffer[256];
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assert((int)strlen(sdp) == sdp_h264(buffer, sizeof(buffer), "RTP/AVP", 0, 96, 90000, extra, sizeof(extra)));
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assert(0 == memcmp(sdp, buffer, strlen(sdp)));
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assert(sizeof(ps) == sdp_h264_load(buffer, sizeof(buffer), config));
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assert(0 == memcmp(buffer, ps, sizeof(ps)));
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}
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#endif
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