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Diffstat (limited to 'ffmpeg/libavformat/rtpdec_jpeg.c')
-rw-r--r--ffmpeg/libavformat/rtpdec_jpeg.c392
1 files changed, 0 insertions, 392 deletions
diff --git a/ffmpeg/libavformat/rtpdec_jpeg.c b/ffmpeg/libavformat/rtpdec_jpeg.c
deleted file mode 100644
index 80fe295..0000000
--- a/ffmpeg/libavformat/rtpdec_jpeg.c
+++ /dev/null
@@ -1,392 +0,0 @@
-/*
- * RTP JPEG-compressed Video Depacketizer, RFC 2435
- * Copyright (c) 2012 Samuel Pitoiset
- *
- * This file is part of FFmpeg.
- *
- * FFmpeg 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.
- *
- * FFmpeg 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 FFmpeg; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
- */
-
-#include "avformat.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 PayloadContext *jpeg_new_context(void)
-{
- return av_mallocz(sizeof(PayloadContext));
-}
-
-static inline void free_frame_if_needed(PayloadContext *jpeg)
-{
- if (jpeg->frame) {
- uint8_t *p;
- avio_close_dyn_buf(jpeg->frame, &p);
- av_free(p);
- jpeg->frame = NULL;
- }
-}
-
-static void jpeg_free_context(PayloadContext *jpeg)
-{
- free_frame_if_needed(jpeg);
- av_free(jpeg);
-}
-
-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. */
- free_frame_if_needed(jpeg);
-
- 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. */
- free_frame_if_needed(jpeg);
- 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,
- .alloc = jpeg_new_context,
- .free = jpeg_free_context,
- .parse_packet = jpeg_parse_packet,
- .static_payload_id = 26,
-};
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