/* * MJPEG/AVI1 to JPEG/JFIF bitstream format filter * Copyright (c) 2010 Adrian Daerr and Nicolas George * * 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 */ /* * Adapted from mjpeg2jpeg.c, with original copyright: * Paris 2010 Adrian Daerr, public domain */ #include <string.h> #include "avcodec.h" #include "mjpeg.h" static const uint8_t jpeg_header[] = { 0xff, 0xd8, // SOI 0xff, 0xe0, // APP0 0x00, 0x10, // APP0 header size (including // this field, but excluding preceding) 0x4a, 0x46, 0x49, 0x46, 0x00, // ID string 'JFIF\0' 0x01, 0x01, // version 0x00, // bits per type 0x00, 0x00, // X density 0x00, 0x00, // Y density 0x00, // X thumbnail size 0x00, // Y thumbnail size }; static const int dht_segment_size = 420; static const uint8_t dht_segment_head[] = { 0xFF, 0xC4, 0x01, 0xA2, 0x00 }; static const uint8_t dht_segment_frag[] = { 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0a, 0x0b, 0x01, 0x00, 0x03, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, }; static uint8_t *append(uint8_t *buf, const uint8_t *src, int size) { memcpy(buf, src, size); return buf + size; } static uint8_t *append_dht_segment(uint8_t *buf) { buf = append(buf, dht_segment_head, sizeof(dht_segment_head)); buf = append(buf, ff_mjpeg_bits_dc_luminance + 1, 16); buf = append(buf, dht_segment_frag, sizeof(dht_segment_frag)); buf = append(buf, ff_mjpeg_val_dc, 12); *(buf++) = 0x10; buf = append(buf, ff_mjpeg_bits_ac_luminance + 1, 16); buf = append(buf, ff_mjpeg_val_ac_luminance, 162); *(buf++) = 0x11; buf = append(buf, ff_mjpeg_bits_ac_chrominance + 1, 16); buf = append(buf, ff_mjpeg_val_ac_chrominance, 162); return buf; } static int mjpeg2jpeg_filter(AVBitStreamFilterContext *bsfc, AVCodecContext *avctx, const char *args, uint8_t **poutbuf, int *poutbuf_size, const uint8_t *buf, int buf_size, int keyframe) { int input_skip, output_size; uint8_t *output, *out; if (buf_size < 12) { av_log(avctx, AV_LOG_ERROR, "input is truncated\n"); return AVERROR_INVALIDDATA; } if (memcmp("AVI1", buf + 6, 4)) { av_log(avctx, AV_LOG_ERROR, "input is not MJPEG/AVI1\n"); return AVERROR_INVALIDDATA; } input_skip = (buf[4] << 8) + buf[5] + 4; if (buf_size < input_skip) { av_log(avctx, AV_LOG_ERROR, "input is truncated\n"); return AVERROR_INVALIDDATA; } output_size = buf_size - input_skip + sizeof(jpeg_header) + dht_segment_size; output = out = av_malloc(output_size); if (!output) return AVERROR(ENOMEM); out = append(out, jpeg_header, sizeof(jpeg_header)); out = append_dht_segment(out); out = append(out, buf + input_skip, buf_size - input_skip); *poutbuf = output; *poutbuf_size = output_size; return 1; } AVBitStreamFilter ff_mjpeg2jpeg_bsf = { .name = "mjpeg2jpeg", .priv_data_size = 0, .filter = mjpeg2jpeg_filter, };