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https://git.videolan.org/git/ffmpeg.git
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bb4a310bb8
This makes it more consistent with depacketizers that don't have any .free function at all, where the payload context is freed by the surrounding framework. Always free the context in the surrounding framework, having the individual depacketizers only free any data they've specifically allocated themselves. This is similar to how this works for demuxer/muxers/codecs - a component shouldn't free the priv_data that the framework has allocated for it. Signed-off-by: Martin Storsjö <martin@martin.st>
387 lines
13 KiB
C
387 lines
13 KiB
C
/*
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* RTP JPEG-compressed Video Depacketizer, RFC 2435
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* Copyright (c) 2012 Samuel Pitoiset
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*
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* This file is part of Libav.
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*
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* Libav 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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* Libav 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 Libav; 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 "avformat.h"
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#include "rtpdec.h"
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#include "rtpdec_formats.h"
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#include "libavutil/intreadwrite.h"
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#include "libavcodec/mjpeg.h"
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#include "libavcodec/bytestream.h"
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/**
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* RTP/JPEG specific private data.
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*/
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struct PayloadContext {
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AVIOContext *frame; ///< current frame buffer
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uint32_t timestamp; ///< current frame timestamp
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int hdr_size; ///< size of the current frame header
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uint8_t qtables[128][128];
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uint8_t qtables_len[128];
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};
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static const uint8_t default_quantizers[128] = {
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/* luma table */
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16, 11, 12, 14, 12, 10, 16, 14,
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13, 14, 18, 17, 16, 19, 24, 40,
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26, 24, 22, 22, 24, 49, 35, 37,
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29, 40, 58, 51, 61, 60, 57, 51,
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56, 55, 64, 72, 92, 78, 64, 68,
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87, 69, 55, 56, 80, 109, 81, 87,
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95, 98, 103, 104, 103, 62, 77, 113,
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121, 112, 100, 120, 92, 101, 103, 99,
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/* chroma table */
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17, 18, 18, 24, 21, 24, 47, 26,
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26, 47, 99, 66, 56, 66, 99, 99,
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99, 99, 99, 99, 99, 99, 99, 99,
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99, 99, 99, 99, 99, 99, 99, 99,
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99, 99, 99, 99, 99, 99, 99, 99,
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99, 99, 99, 99, 99, 99, 99, 99,
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99, 99, 99, 99, 99, 99, 99, 99,
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99, 99, 99, 99, 99, 99, 99, 99
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};
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static void free_frame(PayloadContext *jpeg)
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{
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if (jpeg->frame) {
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uint8_t *p;
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avio_close_dyn_buf(jpeg->frame, &p);
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av_free(p);
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jpeg->frame = NULL;
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}
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}
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static void jpeg_free_context(PayloadContext *jpeg)
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{
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free_frame(jpeg);
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}
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static int jpeg_create_huffman_table(PutByteContext *p, int table_class,
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int table_id, const uint8_t *bits_table,
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const uint8_t *value_table)
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{
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int i, n = 0;
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bytestream2_put_byte(p, table_class << 4 | table_id);
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for (i = 1; i <= 16; i++) {
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n += bits_table[i];
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bytestream2_put_byte(p, bits_table[i]);
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}
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for (i = 0; i < n; i++) {
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bytestream2_put_byte(p, value_table[i]);
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}
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return n + 17;
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}
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static void jpeg_put_marker(PutByteContext *pbc, int code)
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{
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bytestream2_put_byte(pbc, 0xff);
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bytestream2_put_byte(pbc, code);
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}
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static int jpeg_create_header(uint8_t *buf, int size, uint32_t type, uint32_t w,
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uint32_t h, const uint8_t *qtable, int nb_qtable)
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{
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PutByteContext pbc;
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uint8_t *dht_size_ptr;
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int dht_size, i;
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bytestream2_init_writer(&pbc, buf, size);
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/* Convert from blocks to pixels. */
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w <<= 3;
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h <<= 3;
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/* SOI */
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jpeg_put_marker(&pbc, SOI);
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/* JFIF header */
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jpeg_put_marker(&pbc, APP0);
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bytestream2_put_be16(&pbc, 16);
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bytestream2_put_buffer(&pbc, "JFIF", 5);
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bytestream2_put_be16(&pbc, 0x0201);
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bytestream2_put_byte(&pbc, 0);
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bytestream2_put_be16(&pbc, 1);
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bytestream2_put_be16(&pbc, 1);
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bytestream2_put_byte(&pbc, 0);
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bytestream2_put_byte(&pbc, 0);
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/* DQT */
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jpeg_put_marker(&pbc, DQT);
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bytestream2_put_be16(&pbc, 2 + nb_qtable * (1 + 64));
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for (i = 0; i < nb_qtable; i++) {
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bytestream2_put_byte(&pbc, i);
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/* Each table is an array of 64 values given in zig-zag
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* order, identical to the format used in a JFIF DQT
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* marker segment. */
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bytestream2_put_buffer(&pbc, qtable + 64 * i, 64);
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}
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/* DHT */
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jpeg_put_marker(&pbc, DHT);
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dht_size_ptr = pbc.buffer;
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bytestream2_put_be16(&pbc, 0);
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dht_size = 2;
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dht_size += jpeg_create_huffman_table(&pbc, 0, 0,avpriv_mjpeg_bits_dc_luminance,
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avpriv_mjpeg_val_dc);
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dht_size += jpeg_create_huffman_table(&pbc, 0, 1, avpriv_mjpeg_bits_dc_chrominance,
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avpriv_mjpeg_val_dc);
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dht_size += jpeg_create_huffman_table(&pbc, 1, 0, avpriv_mjpeg_bits_ac_luminance,
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avpriv_mjpeg_val_ac_luminance);
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dht_size += jpeg_create_huffman_table(&pbc, 1, 1, avpriv_mjpeg_bits_ac_chrominance,
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avpriv_mjpeg_val_ac_chrominance);
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AV_WB16(dht_size_ptr, dht_size);
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/* SOF0 */
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jpeg_put_marker(&pbc, SOF0);
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bytestream2_put_be16(&pbc, 17); /* size */
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bytestream2_put_byte(&pbc, 8); /* bits per component */
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bytestream2_put_be16(&pbc, h);
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bytestream2_put_be16(&pbc, w);
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bytestream2_put_byte(&pbc, 3); /* number of components */
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bytestream2_put_byte(&pbc, 1); /* component number */
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bytestream2_put_byte(&pbc, (2 << 4) | (type ? 2 : 1)); /* hsample/vsample */
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bytestream2_put_byte(&pbc, 0); /* matrix number */
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bytestream2_put_byte(&pbc, 2); /* component number */
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bytestream2_put_byte(&pbc, 1 << 4 | 1); /* hsample/vsample */
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bytestream2_put_byte(&pbc, nb_qtable == 2 ? 1 : 0); /* matrix number */
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bytestream2_put_byte(&pbc, 3); /* component number */
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bytestream2_put_byte(&pbc, 1 << 4 | 1); /* hsample/vsample */
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bytestream2_put_byte(&pbc, nb_qtable == 2 ? 1 : 0); /* matrix number */
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/* SOS */
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jpeg_put_marker(&pbc, SOS);
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bytestream2_put_be16(&pbc, 12);
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bytestream2_put_byte(&pbc, 3);
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bytestream2_put_byte(&pbc, 1);
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bytestream2_put_byte(&pbc, 0);
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bytestream2_put_byte(&pbc, 2);
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bytestream2_put_byte(&pbc, 17);
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bytestream2_put_byte(&pbc, 3);
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bytestream2_put_byte(&pbc, 17);
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bytestream2_put_byte(&pbc, 0);
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bytestream2_put_byte(&pbc, 63);
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bytestream2_put_byte(&pbc, 0);
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/* Return the length in bytes of the JPEG header. */
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return bytestream2_tell_p(&pbc);
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}
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static void create_default_qtables(uint8_t *qtables, uint8_t q)
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{
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int factor = q;
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int i;
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factor = av_clip(q, 1, 99);
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if (q < 50)
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q = 5000 / factor;
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else
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q = 200 - factor * 2;
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for (i = 0; i < 128; i++) {
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int val = (default_quantizers[i] * q + 50) / 100;
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/* Limit the quantizers to 1 <= q <= 255. */
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val = av_clip(val, 1, 255);
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qtables[i] = val;
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}
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}
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static int jpeg_parse_packet(AVFormatContext *ctx, PayloadContext *jpeg,
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AVStream *st, AVPacket *pkt, uint32_t *timestamp,
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const uint8_t *buf, int len, uint16_t seq,
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int flags)
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{
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uint8_t type, q, width, height;
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const uint8_t *qtables = NULL;
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uint16_t qtable_len;
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uint32_t off;
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int ret;
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if (len < 8) {
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av_log(ctx, AV_LOG_ERROR, "Too short RTP/JPEG packet.\n");
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return AVERROR_INVALIDDATA;
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}
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/* Parse the main JPEG header. */
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off = AV_RB24(buf + 1); /* fragment byte offset */
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type = AV_RB8(buf + 4); /* id of jpeg decoder params */
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q = AV_RB8(buf + 5); /* quantization factor (or table id) */
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width = AV_RB8(buf + 6); /* frame width in 8 pixel blocks */
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height = AV_RB8(buf + 7); /* frame height in 8 pixel blocks */
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buf += 8;
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len -= 8;
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/* Parse the restart marker header. */
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if (type > 63) {
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av_log(ctx, AV_LOG_ERROR,
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"Unimplemented RTP/JPEG restart marker header.\n");
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return AVERROR_PATCHWELCOME;
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}
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if (type > 1) {
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av_log(ctx, AV_LOG_ERROR, "Unimplemented RTP/JPEG type %d\n", type);
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return AVERROR_PATCHWELCOME;
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}
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/* Parse the quantization table header. */
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if (off == 0) {
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/* Start of JPEG data packet. */
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uint8_t new_qtables[128];
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uint8_t hdr[1024];
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if (q > 127) {
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uint8_t precision;
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if (len < 4) {
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av_log(ctx, AV_LOG_ERROR, "Too short RTP/JPEG packet.\n");
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return AVERROR_INVALIDDATA;
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}
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/* The first byte is reserved for future use. */
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precision = AV_RB8(buf + 1); /* size of coefficients */
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qtable_len = AV_RB16(buf + 2); /* length in bytes */
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buf += 4;
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len -= 4;
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if (precision)
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av_log(ctx, AV_LOG_WARNING, "Only 8-bit precision is supported.\n");
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if (qtable_len > 0) {
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if (len < qtable_len) {
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av_log(ctx, AV_LOG_ERROR, "Too short RTP/JPEG packet.\n");
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return AVERROR_INVALIDDATA;
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}
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qtables = buf;
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buf += qtable_len;
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len -= qtable_len;
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if (q < 255) {
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if (jpeg->qtables_len[q - 128] &&
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(jpeg->qtables_len[q - 128] != qtable_len ||
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memcmp(qtables, &jpeg->qtables[q - 128][0], qtable_len))) {
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av_log(ctx, AV_LOG_WARNING,
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"Quantization tables for q=%d changed\n", q);
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} else if (!jpeg->qtables_len[q - 128] && qtable_len <= 128) {
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memcpy(&jpeg->qtables[q - 128][0], qtables,
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qtable_len);
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jpeg->qtables_len[q - 128] = qtable_len;
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}
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}
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} else {
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if (q == 255) {
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av_log(ctx, AV_LOG_ERROR,
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"Invalid RTP/JPEG packet. Quantization tables not found.\n");
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return AVERROR_INVALIDDATA;
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}
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if (!jpeg->qtables_len[q - 128]) {
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av_log(ctx, AV_LOG_ERROR,
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"No quantization tables known for q=%d yet.\n", q);
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return AVERROR_INVALIDDATA;
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}
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qtables = &jpeg->qtables[q - 128][0];
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qtable_len = jpeg->qtables_len[q - 128];
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}
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} else { /* q <= 127 */
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if (q == 0 || q > 99) {
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av_log(ctx, AV_LOG_ERROR, "Reserved q value %d\n", q);
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return AVERROR_INVALIDDATA;
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}
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create_default_qtables(new_qtables, q);
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qtables = new_qtables;
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qtable_len = sizeof(new_qtables);
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}
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/* Skip the current frame in case of the end packet
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* has been lost somewhere. */
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free_frame(jpeg);
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if ((ret = avio_open_dyn_buf(&jpeg->frame)) < 0)
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return ret;
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jpeg->timestamp = *timestamp;
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/* Generate a frame and scan headers that can be prepended to the
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* RTP/JPEG data payload to produce a JPEG compressed image in
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* interchange format. */
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jpeg->hdr_size = jpeg_create_header(hdr, sizeof(hdr), type, width,
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height, qtables,
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qtable_len / 64);
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/* Copy JPEG header to frame buffer. */
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avio_write(jpeg->frame, hdr, jpeg->hdr_size);
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}
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if (!jpeg->frame) {
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av_log(ctx, AV_LOG_ERROR,
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"Received packet without a start chunk; dropping frame.\n");
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return AVERROR(EAGAIN);
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}
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if (jpeg->timestamp != *timestamp) {
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/* Skip the current frame if timestamp is incorrect.
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* A start packet has been lost somewhere. */
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free_frame(jpeg);
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av_log(ctx, AV_LOG_ERROR, "RTP timestamps don't match.\n");
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return AVERROR_INVALIDDATA;
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}
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if (off != avio_tell(jpeg->frame) - jpeg->hdr_size) {
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av_log(ctx, AV_LOG_ERROR,
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"Missing packets; dropping frame.\n");
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return AVERROR(EAGAIN);
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}
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/* Copy data to frame buffer. */
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avio_write(jpeg->frame, buf, len);
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if (flags & RTP_FLAG_MARKER) {
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/* End of JPEG data packet. */
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uint8_t buf[2] = { 0xff, EOI };
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/* Put EOI marker. */
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avio_write(jpeg->frame, buf, sizeof(buf));
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/* Prepare the JPEG packet. */
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if ((ret = ff_rtp_finalize_packet(pkt, &jpeg->frame, st->index)) < 0) {
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av_log(ctx, AV_LOG_ERROR,
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"Error occurred when getting frame buffer.\n");
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return ret;
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}
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return 0;
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}
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return AVERROR(EAGAIN);
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}
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RTPDynamicProtocolHandler ff_jpeg_dynamic_handler = {
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.enc_name = "JPEG",
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.codec_type = AVMEDIA_TYPE_VIDEO,
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.codec_id = AV_CODEC_ID_MJPEG,
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.priv_data_size = sizeof(PayloadContext),
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.free = jpeg_free_context,
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.parse_packet = jpeg_parse_packet,
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.static_payload_id = 26,
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};
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