void ff_rtp_send_jpeg(AVFormatContext *s1, const uint8_t *buf, int size) { RTPMuxContext *s = s1->priv_data; const uint8_t *qtables = NULL; int nb_qtables = 0; uint8_t type = 1; /* default pixel format is AV_PIX_FMT_YUVJ420P */ uint8_t w, h; uint8_t *p; int off = 0; /* fragment offset of the current JPEG frame */ int len; int i; s->buf_ptr = s->buf; s->timestamp = s->cur_timestamp; /* convert video pixel dimensions from pixels to blocks */ w = s1->streams[0]->codec->width >> 3; h = s1->streams[0]->codec->height >> 3; /* check if pixel format is not the normal 420 case */ if (s1->streams[0]->codec->pix_fmt == AV_PIX_FMT_YUVJ422P) { type = 0; } else if (s1->streams[0]->codec->pix_fmt == AV_PIX_FMT_YUVJ420P) { type = 1; } else { av_log(s1, AV_LOG_ERROR, "Unsupported pixel format\n"); return; } /* preparse the header for getting some infos */ for (i = 0; i < size; i++) { if (buf[i] != 0xff) continue; if (buf[i + 1] == DQT) { if (buf[i + 4]) av_log(s1, AV_LOG_WARNING, "Only 8-bit precision is supported.\n"); /* a quantization table is 64 bytes long */ nb_qtables = AV_RB16(&buf[i + 2]) / 65; if (i + 4 + nb_qtables * 65 > size) { av_log(s1, AV_LOG_ERROR, "Too short JPEG header. Aborted!\n"); return; } qtables = &buf[i + 4]; } else if (buf[i + 1] == SOF0) { if (buf[i + 14] != 17 || buf[i + 17] != 17) { av_log(s1, AV_LOG_ERROR, "Only 1x1 chroma blocks are supported. Aborted!\n"); return; } } else if (buf[i + 1] == SOS) { /* SOS is last marker in the header */ i += AV_RB16(&buf[i + 2]) + 2; break; } } /* skip JPEG header */ buf += i; size -= i; for (i = size - 2; i >= 0; i--) { if (buf[i] == 0xff && buf[i + 1] == EOI) { /* Remove the EOI marker */ size = i; break; } } p = s->buf_ptr; while (size > 0) { int hdr_size = 8; if (off == 0 && nb_qtables) hdr_size += 4 + 64 * nb_qtables; /* payload max in one packet */ len = FFMIN(size, s->max_payload_size - hdr_size); /* set main header */ bytestream_put_byte(&p, 0); bytestream_put_be24(&p, off); bytestream_put_byte(&p, type); bytestream_put_byte(&p, 255); bytestream_put_byte(&p, w); bytestream_put_byte(&p, h); if (off == 0 && nb_qtables) { /* set quantization tables header */ bytestream_put_byte(&p, 0); bytestream_put_byte(&p, 0); bytestream_put_be16(&p, 64 * nb_qtables); for (i = 0; i < nb_qtables; i++) bytestream_put_buffer(&p, &qtables[65 * i + 1], 64); } /* copy payload data */ memcpy(p, buf, len); /* marker bit is last packet in frame */ ff_rtp_send_data(s1, s->buf, len + hdr_size, size == len); buf += len; size -= len; off += len; p = s->buf; } }