| /* |
| * 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 "libavutil/error.h" |
| #include "libavutil/intreadwrite.h" |
| |
| #include "bsf.h" |
| #include "bsf_internal.h" |
| #include "jpegtables.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, avpriv_mjpeg_bits_dc_luminance + 1, 16); |
| buf = append(buf, dht_segment_frag, sizeof(dht_segment_frag)); |
| buf = append(buf, avpriv_mjpeg_val_dc, 12); |
| *(buf++) = 0x10; |
| buf = append(buf, avpriv_mjpeg_bits_ac_luminance + 1, 16); |
| buf = append(buf, avpriv_mjpeg_val_ac_luminance, 162); |
| *(buf++) = 0x11; |
| buf = append(buf, avpriv_mjpeg_bits_ac_chrominance + 1, 16); |
| buf = append(buf, avpriv_mjpeg_val_ac_chrominance, 162); |
| return buf; |
| } |
| |
| static int mjpeg2jpeg_filter(AVBSFContext *ctx, AVPacket *out) |
| { |
| AVPacket *in; |
| int ret = 0; |
| int input_skip, output_size; |
| uint8_t *output; |
| |
| ret = ff_bsf_get_packet(ctx, &in); |
| if (ret < 0) |
| return ret; |
| |
| if (in->size < 12) { |
| av_log(ctx, AV_LOG_ERROR, "input is truncated\n"); |
| ret = AVERROR_INVALIDDATA; |
| goto fail; |
| } |
| if (AV_RB16(in->data) != 0xffd8) { |
| av_log(ctx, AV_LOG_ERROR, "input is not MJPEG\n"); |
| ret = AVERROR_INVALIDDATA; |
| goto fail; |
| } |
| if (in->data[2] == 0xff && in->data[3] == APP0) { |
| input_skip = (in->data[4] << 8) + in->data[5] + 4; |
| } else { |
| input_skip = 2; |
| } |
| if (in->size < input_skip) { |
| av_log(ctx, AV_LOG_ERROR, "input is truncated\n"); |
| ret = AVERROR_INVALIDDATA; |
| goto fail; |
| } |
| output_size = in->size - input_skip + |
| sizeof(jpeg_header) + dht_segment_size; |
| ret = av_new_packet(out, output_size); |
| if (ret < 0) |
| goto fail; |
| |
| output = out->data; |
| |
| output = append(output, jpeg_header, sizeof(jpeg_header)); |
| output = append_dht_segment(output); |
| output = append(output, in->data + input_skip, in->size - input_skip); |
| |
| ret = av_packet_copy_props(out, in); |
| if (ret < 0) |
| goto fail; |
| |
| fail: |
| if (ret < 0) |
| av_packet_unref(out); |
| av_packet_free(&in); |
| return ret; |
| } |
| |
| static const enum AVCodecID codec_ids[] = { |
| AV_CODEC_ID_MJPEG, AV_CODEC_ID_NONE, |
| }; |
| |
| const AVBitStreamFilter ff_mjpeg2jpeg_bsf = { |
| .name = "mjpeg2jpeg", |
| .filter = mjpeg2jpeg_filter, |
| .codec_ids = codec_ids, |
| }; |