mirror of
https://github.com/FFmpeg/FFmpeg.git
synced 2024-11-26 19:01:44 +02:00
d594dbecce
Many of these functions were named foo_free_context, and since the functions no longer should free the context itself, only allocated elements within it, the previous naming was slightly misleading. Signed-off-by: Martin Storsjö <martin@martin.st>
378 lines
13 KiB
C
378 lines
13 KiB
C
/*
|
|
* RTP JPEG-compressed Video Depacketizer, RFC 2435
|
|
* Copyright (c) 2012 Samuel Pitoiset
|
|
*
|
|
* This file is part of Libav.
|
|
*
|
|
* Libav is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU Lesser General Public
|
|
* License as published by the Free Software Foundation; either
|
|
* version 2.1 of the License, or (at your option) any later version.
|
|
*
|
|
* Libav is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
* Lesser General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU Lesser General Public
|
|
* License along with Libav; if not, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
|
|
*/
|
|
|
|
#include "avformat.h"
|
|
#include "avio_internal.h"
|
|
#include "rtpdec.h"
|
|
#include "rtpdec_formats.h"
|
|
#include "libavutil/intreadwrite.h"
|
|
#include "libavcodec/mjpeg.h"
|
|
#include "libavcodec/bytestream.h"
|
|
|
|
/**
|
|
* RTP/JPEG specific private data.
|
|
*/
|
|
struct PayloadContext {
|
|
AVIOContext *frame; ///< current frame buffer
|
|
uint32_t timestamp; ///< current frame timestamp
|
|
int hdr_size; ///< size of the current frame header
|
|
uint8_t qtables[128][128];
|
|
uint8_t qtables_len[128];
|
|
};
|
|
|
|
static const uint8_t default_quantizers[128] = {
|
|
/* luma table */
|
|
16, 11, 12, 14, 12, 10, 16, 14,
|
|
13, 14, 18, 17, 16, 19, 24, 40,
|
|
26, 24, 22, 22, 24, 49, 35, 37,
|
|
29, 40, 58, 51, 61, 60, 57, 51,
|
|
56, 55, 64, 72, 92, 78, 64, 68,
|
|
87, 69, 55, 56, 80, 109, 81, 87,
|
|
95, 98, 103, 104, 103, 62, 77, 113,
|
|
121, 112, 100, 120, 92, 101, 103, 99,
|
|
|
|
/* chroma table */
|
|
17, 18, 18, 24, 21, 24, 47, 26,
|
|
26, 47, 99, 66, 56, 66, 99, 99,
|
|
99, 99, 99, 99, 99, 99, 99, 99,
|
|
99, 99, 99, 99, 99, 99, 99, 99,
|
|
99, 99, 99, 99, 99, 99, 99, 99,
|
|
99, 99, 99, 99, 99, 99, 99, 99,
|
|
99, 99, 99, 99, 99, 99, 99, 99,
|
|
99, 99, 99, 99, 99, 99, 99, 99
|
|
};
|
|
|
|
static void jpeg_close_context(PayloadContext *jpeg)
|
|
{
|
|
ffio_free_dyn_buf(&jpeg->frame);
|
|
}
|
|
|
|
static int jpeg_create_huffman_table(PutByteContext *p, int table_class,
|
|
int table_id, const uint8_t *bits_table,
|
|
const uint8_t *value_table)
|
|
{
|
|
int i, n = 0;
|
|
|
|
bytestream2_put_byte(p, table_class << 4 | table_id);
|
|
|
|
for (i = 1; i <= 16; i++) {
|
|
n += bits_table[i];
|
|
bytestream2_put_byte(p, bits_table[i]);
|
|
}
|
|
|
|
for (i = 0; i < n; i++) {
|
|
bytestream2_put_byte(p, value_table[i]);
|
|
}
|
|
return n + 17;
|
|
}
|
|
|
|
static void jpeg_put_marker(PutByteContext *pbc, int code)
|
|
{
|
|
bytestream2_put_byte(pbc, 0xff);
|
|
bytestream2_put_byte(pbc, code);
|
|
}
|
|
|
|
static int jpeg_create_header(uint8_t *buf, int size, uint32_t type, uint32_t w,
|
|
uint32_t h, const uint8_t *qtable, int nb_qtable)
|
|
{
|
|
PutByteContext pbc;
|
|
uint8_t *dht_size_ptr;
|
|
int dht_size, i;
|
|
|
|
bytestream2_init_writer(&pbc, buf, size);
|
|
|
|
/* Convert from blocks to pixels. */
|
|
w <<= 3;
|
|
h <<= 3;
|
|
|
|
/* SOI */
|
|
jpeg_put_marker(&pbc, SOI);
|
|
|
|
/* JFIF header */
|
|
jpeg_put_marker(&pbc, APP0);
|
|
bytestream2_put_be16(&pbc, 16);
|
|
bytestream2_put_buffer(&pbc, "JFIF", 5);
|
|
bytestream2_put_be16(&pbc, 0x0201);
|
|
bytestream2_put_byte(&pbc, 0);
|
|
bytestream2_put_be16(&pbc, 1);
|
|
bytestream2_put_be16(&pbc, 1);
|
|
bytestream2_put_byte(&pbc, 0);
|
|
bytestream2_put_byte(&pbc, 0);
|
|
|
|
/* DQT */
|
|
jpeg_put_marker(&pbc, DQT);
|
|
bytestream2_put_be16(&pbc, 2 + nb_qtable * (1 + 64));
|
|
|
|
for (i = 0; i < nb_qtable; i++) {
|
|
bytestream2_put_byte(&pbc, i);
|
|
|
|
/* Each table is an array of 64 values given in zig-zag
|
|
* order, identical to the format used in a JFIF DQT
|
|
* marker segment. */
|
|
bytestream2_put_buffer(&pbc, qtable + 64 * i, 64);
|
|
}
|
|
|
|
/* DHT */
|
|
jpeg_put_marker(&pbc, DHT);
|
|
dht_size_ptr = pbc.buffer;
|
|
bytestream2_put_be16(&pbc, 0);
|
|
|
|
dht_size = 2;
|
|
dht_size += jpeg_create_huffman_table(&pbc, 0, 0,avpriv_mjpeg_bits_dc_luminance,
|
|
avpriv_mjpeg_val_dc);
|
|
dht_size += jpeg_create_huffman_table(&pbc, 0, 1, avpriv_mjpeg_bits_dc_chrominance,
|
|
avpriv_mjpeg_val_dc);
|
|
dht_size += jpeg_create_huffman_table(&pbc, 1, 0, avpriv_mjpeg_bits_ac_luminance,
|
|
avpriv_mjpeg_val_ac_luminance);
|
|
dht_size += jpeg_create_huffman_table(&pbc, 1, 1, avpriv_mjpeg_bits_ac_chrominance,
|
|
avpriv_mjpeg_val_ac_chrominance);
|
|
AV_WB16(dht_size_ptr, dht_size);
|
|
|
|
/* SOF0 */
|
|
jpeg_put_marker(&pbc, SOF0);
|
|
bytestream2_put_be16(&pbc, 17); /* size */
|
|
bytestream2_put_byte(&pbc, 8); /* bits per component */
|
|
bytestream2_put_be16(&pbc, h);
|
|
bytestream2_put_be16(&pbc, w);
|
|
bytestream2_put_byte(&pbc, 3); /* number of components */
|
|
bytestream2_put_byte(&pbc, 1); /* component number */
|
|
bytestream2_put_byte(&pbc, (2 << 4) | (type ? 2 : 1)); /* hsample/vsample */
|
|
bytestream2_put_byte(&pbc, 0); /* matrix number */
|
|
bytestream2_put_byte(&pbc, 2); /* component number */
|
|
bytestream2_put_byte(&pbc, 1 << 4 | 1); /* hsample/vsample */
|
|
bytestream2_put_byte(&pbc, nb_qtable == 2 ? 1 : 0); /* matrix number */
|
|
bytestream2_put_byte(&pbc, 3); /* component number */
|
|
bytestream2_put_byte(&pbc, 1 << 4 | 1); /* hsample/vsample */
|
|
bytestream2_put_byte(&pbc, nb_qtable == 2 ? 1 : 0); /* matrix number */
|
|
|
|
/* SOS */
|
|
jpeg_put_marker(&pbc, SOS);
|
|
bytestream2_put_be16(&pbc, 12);
|
|
bytestream2_put_byte(&pbc, 3);
|
|
bytestream2_put_byte(&pbc, 1);
|
|
bytestream2_put_byte(&pbc, 0);
|
|
bytestream2_put_byte(&pbc, 2);
|
|
bytestream2_put_byte(&pbc, 17);
|
|
bytestream2_put_byte(&pbc, 3);
|
|
bytestream2_put_byte(&pbc, 17);
|
|
bytestream2_put_byte(&pbc, 0);
|
|
bytestream2_put_byte(&pbc, 63);
|
|
bytestream2_put_byte(&pbc, 0);
|
|
|
|
/* Return the length in bytes of the JPEG header. */
|
|
return bytestream2_tell_p(&pbc);
|
|
}
|
|
|
|
static void create_default_qtables(uint8_t *qtables, uint8_t q)
|
|
{
|
|
int factor = q;
|
|
int i;
|
|
|
|
factor = av_clip(q, 1, 99);
|
|
|
|
if (q < 50)
|
|
q = 5000 / factor;
|
|
else
|
|
q = 200 - factor * 2;
|
|
|
|
for (i = 0; i < 128; i++) {
|
|
int val = (default_quantizers[i] * q + 50) / 100;
|
|
|
|
/* Limit the quantizers to 1 <= q <= 255. */
|
|
val = av_clip(val, 1, 255);
|
|
qtables[i] = val;
|
|
}
|
|
}
|
|
|
|
static int jpeg_parse_packet(AVFormatContext *ctx, PayloadContext *jpeg,
|
|
AVStream *st, AVPacket *pkt, uint32_t *timestamp,
|
|
const uint8_t *buf, int len, uint16_t seq,
|
|
int flags)
|
|
{
|
|
uint8_t type, q, width, height;
|
|
const uint8_t *qtables = NULL;
|
|
uint16_t qtable_len;
|
|
uint32_t off;
|
|
int ret;
|
|
|
|
if (len < 8) {
|
|
av_log(ctx, AV_LOG_ERROR, "Too short RTP/JPEG packet.\n");
|
|
return AVERROR_INVALIDDATA;
|
|
}
|
|
|
|
/* Parse the main JPEG header. */
|
|
off = AV_RB24(buf + 1); /* fragment byte offset */
|
|
type = AV_RB8(buf + 4); /* id of jpeg decoder params */
|
|
q = AV_RB8(buf + 5); /* quantization factor (or table id) */
|
|
width = AV_RB8(buf + 6); /* frame width in 8 pixel blocks */
|
|
height = AV_RB8(buf + 7); /* frame height in 8 pixel blocks */
|
|
buf += 8;
|
|
len -= 8;
|
|
|
|
/* Parse the restart marker header. */
|
|
if (type > 63) {
|
|
av_log(ctx, AV_LOG_ERROR,
|
|
"Unimplemented RTP/JPEG restart marker header.\n");
|
|
return AVERROR_PATCHWELCOME;
|
|
}
|
|
if (type > 1) {
|
|
av_log(ctx, AV_LOG_ERROR, "Unimplemented RTP/JPEG type %d\n", type);
|
|
return AVERROR_PATCHWELCOME;
|
|
}
|
|
|
|
/* Parse the quantization table header. */
|
|
if (off == 0) {
|
|
/* Start of JPEG data packet. */
|
|
uint8_t new_qtables[128];
|
|
uint8_t hdr[1024];
|
|
|
|
if (q > 127) {
|
|
uint8_t precision;
|
|
if (len < 4) {
|
|
av_log(ctx, AV_LOG_ERROR, "Too short RTP/JPEG packet.\n");
|
|
return AVERROR_INVALIDDATA;
|
|
}
|
|
|
|
/* The first byte is reserved for future use. */
|
|
precision = AV_RB8(buf + 1); /* size of coefficients */
|
|
qtable_len = AV_RB16(buf + 2); /* length in bytes */
|
|
buf += 4;
|
|
len -= 4;
|
|
|
|
if (precision)
|
|
av_log(ctx, AV_LOG_WARNING, "Only 8-bit precision is supported.\n");
|
|
|
|
if (qtable_len > 0) {
|
|
if (len < qtable_len) {
|
|
av_log(ctx, AV_LOG_ERROR, "Too short RTP/JPEG packet.\n");
|
|
return AVERROR_INVALIDDATA;
|
|
}
|
|
qtables = buf;
|
|
buf += qtable_len;
|
|
len -= qtable_len;
|
|
if (q < 255) {
|
|
if (jpeg->qtables_len[q - 128] &&
|
|
(jpeg->qtables_len[q - 128] != qtable_len ||
|
|
memcmp(qtables, &jpeg->qtables[q - 128][0], qtable_len))) {
|
|
av_log(ctx, AV_LOG_WARNING,
|
|
"Quantization tables for q=%d changed\n", q);
|
|
} else if (!jpeg->qtables_len[q - 128] && qtable_len <= 128) {
|
|
memcpy(&jpeg->qtables[q - 128][0], qtables,
|
|
qtable_len);
|
|
jpeg->qtables_len[q - 128] = qtable_len;
|
|
}
|
|
}
|
|
} else {
|
|
if (q == 255) {
|
|
av_log(ctx, AV_LOG_ERROR,
|
|
"Invalid RTP/JPEG packet. Quantization tables not found.\n");
|
|
return AVERROR_INVALIDDATA;
|
|
}
|
|
if (!jpeg->qtables_len[q - 128]) {
|
|
av_log(ctx, AV_LOG_ERROR,
|
|
"No quantization tables known for q=%d yet.\n", q);
|
|
return AVERROR_INVALIDDATA;
|
|
}
|
|
qtables = &jpeg->qtables[q - 128][0];
|
|
qtable_len = jpeg->qtables_len[q - 128];
|
|
}
|
|
} else { /* q <= 127 */
|
|
if (q == 0 || q > 99) {
|
|
av_log(ctx, AV_LOG_ERROR, "Reserved q value %d\n", q);
|
|
return AVERROR_INVALIDDATA;
|
|
}
|
|
create_default_qtables(new_qtables, q);
|
|
qtables = new_qtables;
|
|
qtable_len = sizeof(new_qtables);
|
|
}
|
|
|
|
/* Skip the current frame in case of the end packet
|
|
* has been lost somewhere. */
|
|
ffio_free_dyn_buf(&jpeg->frame);
|
|
|
|
if ((ret = avio_open_dyn_buf(&jpeg->frame)) < 0)
|
|
return ret;
|
|
jpeg->timestamp = *timestamp;
|
|
|
|
/* Generate a frame and scan headers that can be prepended to the
|
|
* RTP/JPEG data payload to produce a JPEG compressed image in
|
|
* interchange format. */
|
|
jpeg->hdr_size = jpeg_create_header(hdr, sizeof(hdr), type, width,
|
|
height, qtables,
|
|
qtable_len / 64);
|
|
|
|
/* Copy JPEG header to frame buffer. */
|
|
avio_write(jpeg->frame, hdr, jpeg->hdr_size);
|
|
}
|
|
|
|
if (!jpeg->frame) {
|
|
av_log(ctx, AV_LOG_ERROR,
|
|
"Received packet without a start chunk; dropping frame.\n");
|
|
return AVERROR(EAGAIN);
|
|
}
|
|
|
|
if (jpeg->timestamp != *timestamp) {
|
|
/* Skip the current frame if timestamp is incorrect.
|
|
* A start packet has been lost somewhere. */
|
|
ffio_free_dyn_buf(&jpeg->frame);
|
|
av_log(ctx, AV_LOG_ERROR, "RTP timestamps don't match.\n");
|
|
return AVERROR_INVALIDDATA;
|
|
}
|
|
|
|
if (off != avio_tell(jpeg->frame) - jpeg->hdr_size) {
|
|
av_log(ctx, AV_LOG_ERROR,
|
|
"Missing packets; dropping frame.\n");
|
|
return AVERROR(EAGAIN);
|
|
}
|
|
|
|
/* Copy data to frame buffer. */
|
|
avio_write(jpeg->frame, buf, len);
|
|
|
|
if (flags & RTP_FLAG_MARKER) {
|
|
/* End of JPEG data packet. */
|
|
uint8_t buf[2] = { 0xff, EOI };
|
|
|
|
/* Put EOI marker. */
|
|
avio_write(jpeg->frame, buf, sizeof(buf));
|
|
|
|
/* Prepare the JPEG packet. */
|
|
if ((ret = ff_rtp_finalize_packet(pkt, &jpeg->frame, st->index)) < 0) {
|
|
av_log(ctx, AV_LOG_ERROR,
|
|
"Error occurred when getting frame buffer.\n");
|
|
return ret;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
return AVERROR(EAGAIN);
|
|
}
|
|
|
|
RTPDynamicProtocolHandler ff_jpeg_dynamic_handler = {
|
|
.enc_name = "JPEG",
|
|
.codec_type = AVMEDIA_TYPE_VIDEO,
|
|
.codec_id = AV_CODEC_ID_MJPEG,
|
|
.priv_data_size = sizeof(PayloadContext),
|
|
.close = jpeg_close_context,
|
|
.parse_packet = jpeg_parse_packet,
|
|
.static_payload_id = 26,
|
|
};
|