static int hevc_handle_packet(AVFormatContext *ctx, PayloadContext *rtp_hevc_ctx, AVStream *st, AVPacket *pkt, uint32_t *timestamp, const uint8_t *buf, int len, uint16_t seq, int flags) { const uint8_t *rtp_pl = buf; int tid, lid, nal_type; int first_fragment, last_fragment, fu_type; uint8_t new_nal_header[2]; int res = 0; /* sanity check for size of input packet: 1 byte payload at least */ if (len < RTP_HEVC_PAYLOAD_HEADER_SIZE + 1) { av_log(ctx, AV_LOG_ERROR, "Too short RTP/HEVC packet, got %d bytes\n", len); return AVERROR_INVALIDDATA; } /* * decode the HEVC payload header according to section 4 of draft version 6: * * 0 1 * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ * |F| Type | LayerId | TID | * +-------------+-----------------+ * * Forbidden zero (F): 1 bit * NAL unit type (Type): 6 bits * NUH layer ID (LayerId): 6 bits * NUH temporal ID plus 1 (TID): 3 bits */ nal_type = (buf[0] >> 1) & 0x3f; lid = ((buf[0] << 5) & 0x20) | ((buf[1] >> 3) & 0x1f); tid = buf[1] & 0x07; /* sanity check for correct layer ID */ if (lid) { /* future scalable or 3D video coding extensions */ avpriv_report_missing_feature(ctx, "Multi-layer HEVC coding\n"); return AVERROR_PATCHWELCOME; } /* sanity check for correct temporal ID */ if (!tid) { av_log(ctx, AV_LOG_ERROR, "Illegal temporal ID in RTP/HEVC packet\n"); return AVERROR_INVALIDDATA; } /* sanity check for correct NAL unit type */ if (nal_type > 50) { av_log(ctx, AV_LOG_ERROR, "Unsupported (HEVC) NAL type (%d)\n", nal_type); return AVERROR_INVALIDDATA; } switch (nal_type) { /* video parameter set (VPS) */ case 32: /* sequence parameter set (SPS) */ case 33: /* picture parameter set (PPS) */ case 34: /* supplemental enhancement information (SEI) */ case 39: /* single NAL unit packet */ default: /* sanity check for size of input packet: 1 byte payload at least */ if (len < 1) { av_log(ctx, AV_LOG_ERROR, "Too short RTP/HEVC packet, got %d bytes of NAL unit type %d\n", len, nal_type); return AVERROR_INVALIDDATA; } /* create A/V packet */ if ((res = av_new_packet(pkt, sizeof(start_sequence) + len)) < 0) return res; /* A/V packet: copy start sequence */ memcpy(pkt->data, start_sequence, sizeof(start_sequence)); /* A/V packet: copy NAL unit data */ memcpy(pkt->data + sizeof(start_sequence), buf, len); break; /* aggregated packet (AP) - with two or more NAL units */ case 48: /* pass the HEVC payload header */ buf += RTP_HEVC_PAYLOAD_HEADER_SIZE; len -= RTP_HEVC_PAYLOAD_HEADER_SIZE; /* pass the HEVC DONL field */ if (rtp_hevc_ctx->using_donl_field) { buf += RTP_HEVC_DONL_FIELD_SIZE; len -= RTP_HEVC_DONL_FIELD_SIZE; } res = ff_h264_handle_aggregated_packet(ctx, pkt, buf, len, rtp_hevc_ctx->using_donl_field ? RTP_HEVC_DOND_FIELD_SIZE : 0, NULL, 0); if (res < 0) return res; break; /* fragmentation unit (FU) */ case 49: /* pass the HEVC payload header */ buf += RTP_HEVC_PAYLOAD_HEADER_SIZE; len -= RTP_HEVC_PAYLOAD_HEADER_SIZE; /* * decode the FU header * * 0 1 2 3 4 5 6 7 * +-+-+-+-+-+-+-+-+ * |S|E| FuType | * +---------------+ * * Start fragment (S): 1 bit * End fragment (E): 1 bit * FuType: 6 bits */ first_fragment = buf[0] & 0x80; last_fragment = buf[0] & 0x40; fu_type = buf[0] & 0x3f; /* pass the HEVC FU header */ buf += RTP_HEVC_FU_HEADER_SIZE; len -= RTP_HEVC_FU_HEADER_SIZE; /* pass the HEVC DONL field */ if (rtp_hevc_ctx->using_donl_field) { buf += RTP_HEVC_DONL_FIELD_SIZE; len -= RTP_HEVC_DONL_FIELD_SIZE; } av_dlog(ctx, " FU type %d with %d bytes\n", fu_type, len); if (len <= 0) { /* sanity check for size of input packet: 1 byte payload at least */ av_log(ctx, AV_LOG_ERROR, "Too short RTP/HEVC packet, got %d bytes of NAL unit type %d\n", len, nal_type); return AVERROR_INVALIDDATA; } if (first_fragment && last_fragment) { av_log(ctx, AV_LOG_ERROR, "Illegal combination of S and E bit in RTP/HEVC packet\n"); return AVERROR_INVALIDDATA; } new_nal_header[0] = (rtp_pl[0] & 0x81) | (fu_type << 1); new_nal_header[1] = rtp_pl[1]; res = ff_h264_handle_frag_packet(pkt, buf, len, first_fragment, new_nal_header, sizeof(new_nal_header)); break; /* PACI packet */ case 50: /* Temporal scalability control information (TSCI) */ avpriv_report_missing_feature(ctx, "PACI packets for RTP/HEVC\n"); res = AVERROR_PATCHWELCOME; break; } pkt->stream_index = st->index; return res; }