forked from KolibriOS/kolibrios
139 lines
4.2 KiB
C
139 lines
4.2 KiB
C
/*
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* RTP JPEG-compressed video Packetizer, RFC 2435
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* Copyright (c) 2012 Samuel Pitoiset
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "libavcodec/bytestream.h"
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#include "libavcodec/mjpeg.h"
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#include "libavutil/intreadwrite.h"
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#include "rtpenc.h"
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void ff_rtp_send_jpeg(AVFormatContext *s1, const uint8_t *buf, int size)
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{
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RTPMuxContext *s = s1->priv_data;
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const uint8_t *qtables = NULL;
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int nb_qtables = 0;
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uint8_t type = 1; /* default pixel format is AV_PIX_FMT_YUVJ420P */
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uint8_t w, h;
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uint8_t *p;
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int off = 0; /* fragment offset of the current JPEG frame */
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int len;
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int i;
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s->buf_ptr = s->buf;
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s->timestamp = s->cur_timestamp;
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/* convert video pixel dimensions from pixels to blocks */
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w = s1->streams[0]->codec->width >> 3;
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h = s1->streams[0]->codec->height >> 3;
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/* check if pixel format is not the normal 420 case */
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if (s1->streams[0]->codec->pix_fmt == AV_PIX_FMT_YUVJ422P) {
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type = 0;
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} else if (s1->streams[0]->codec->pix_fmt == AV_PIX_FMT_YUVJ420P) {
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type = 1;
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} else {
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av_log(s1, AV_LOG_ERROR, "Unsupported pixel format\n");
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return;
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}
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/* preparse the header for getting some infos */
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for (i = 0; i < size; i++) {
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if (buf[i] != 0xff)
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continue;
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if (buf[i + 1] == DQT) {
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if (buf[i + 4])
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av_log(s1, AV_LOG_WARNING,
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"Only 8-bit precision is supported.\n");
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/* a quantization table is 64 bytes long */
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nb_qtables = AV_RB16(&buf[i + 2]) / 65;
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if (i + 4 + nb_qtables * 65 > size) {
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av_log(s1, AV_LOG_ERROR, "Too short JPEG header. Aborted!\n");
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return;
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}
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qtables = &buf[i + 4];
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} else if (buf[i + 1] == SOF0) {
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if (buf[i + 14] != 17 || buf[i + 17] != 17) {
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av_log(s1, AV_LOG_ERROR,
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"Only 1x1 chroma blocks are supported. Aborted!\n");
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return;
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}
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} else if (buf[i + 1] == SOS) {
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/* SOS is last marker in the header */
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i += AV_RB16(&buf[i + 2]) + 2;
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break;
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}
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}
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/* skip JPEG header */
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buf += i;
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size -= i;
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for (i = size - 2; i >= 0; i--) {
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if (buf[i] == 0xff && buf[i + 1] == EOI) {
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/* Remove the EOI marker */
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size = i;
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break;
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}
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}
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p = s->buf_ptr;
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while (size > 0) {
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int hdr_size = 8;
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if (off == 0 && nb_qtables)
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hdr_size += 4 + 64 * nb_qtables;
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/* payload max in one packet */
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len = FFMIN(size, s->max_payload_size - hdr_size);
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/* set main header */
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bytestream_put_byte(&p, 0);
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bytestream_put_be24(&p, off);
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bytestream_put_byte(&p, type);
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bytestream_put_byte(&p, 255);
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bytestream_put_byte(&p, w);
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bytestream_put_byte(&p, h);
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if (off == 0 && nb_qtables) {
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/* set quantization tables header */
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bytestream_put_byte(&p, 0);
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bytestream_put_byte(&p, 0);
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bytestream_put_be16(&p, 64 * nb_qtables);
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for (i = 0; i < nb_qtables; i++)
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bytestream_put_buffer(&p, &qtables[65 * i + 1], 64);
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}
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/* copy payload data */
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memcpy(p, buf, len);
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/* marker bit is last packet in frame */
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ff_rtp_send_data(s1, s->buf, len + hdr_size, size == len);
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buf += len;
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size -= len;
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off += len;
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p = s->buf;
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}
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}
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