| Line | Branch | Exec | Source |
|---|---|---|---|
| 1 | /* | ||
| 2 | * MJPEG/AVI1 to JPEG/JFIF bitstream format filter | ||
| 3 | * Copyright (c) 2010 Adrian Daerr and Nicolas George | ||
| 4 | * | ||
| 5 | * This file is part of FFmpeg. | ||
| 6 | * | ||
| 7 | * FFmpeg is free software; you can redistribute it and/or | ||
| 8 | * modify it under the terms of the GNU Lesser General Public | ||
| 9 | * License as published by the Free Software Foundation; either | ||
| 10 | * version 2.1 of the License, or (at your option) any later version. | ||
| 11 | * | ||
| 12 | * FFmpeg is distributed in the hope that it will be useful, | ||
| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | ||
| 15 | * Lesser General Public License for more details. | ||
| 16 | * | ||
| 17 | * You should have received a copy of the GNU Lesser General Public | ||
| 18 | * License along with FFmpeg; if not, write to the Free Software | ||
| 19 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | ||
| 20 | */ | ||
| 21 | |||
| 22 | /* | ||
| 23 | * Adapted from mjpeg2jpeg.c, with original copyright: | ||
| 24 | * Paris 2010 Adrian Daerr, public domain | ||
| 25 | */ | ||
| 26 | |||
| 27 | #include <string.h> | ||
| 28 | |||
| 29 | #include "libavutil/error.h" | ||
| 30 | #include "libavutil/intreadwrite.h" | ||
| 31 | |||
| 32 | #include "bsf.h" | ||
| 33 | #include "bsf_internal.h" | ||
| 34 | #include "jpegtables.h" | ||
| 35 | #include "mjpeg.h" | ||
| 36 | |||
| 37 | static const uint8_t jpeg_header[] = { | ||
| 38 | 0xff, 0xd8, // SOI | ||
| 39 | 0xff, 0xe0, // APP0 | ||
| 40 | 0x00, 0x10, // APP0 header size (including | ||
| 41 | // this field, but excluding preceding) | ||
| 42 | 0x4a, 0x46, 0x49, 0x46, 0x00, // ID string 'JFIF\0' | ||
| 43 | 0x01, 0x01, // version | ||
| 44 | 0x00, // bits per type | ||
| 45 | 0x00, 0x00, // X density | ||
| 46 | 0x00, 0x00, // Y density | ||
| 47 | 0x00, // X thumbnail size | ||
| 48 | 0x00, // Y thumbnail size | ||
| 49 | }; | ||
| 50 | |||
| 51 | static const int dht_segment_size = 420; | ||
| 52 | static const uint8_t dht_segment_head[] = { 0xFF, 0xC4, 0x01, 0xA2, 0x00 }; | ||
| 53 | static const uint8_t dht_segment_frag[] = { | ||
| 54 | 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, | ||
| 55 | 0x0a, 0x0b, 0x01, 0x00, 0x03, 0x01, 0x01, 0x01, 0x01, 0x01, | ||
| 56 | 0x01, 0x01, 0x01, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, | ||
| 57 | }; | ||
| 58 | |||
| 59 | ✗ | static uint8_t *append(uint8_t *buf, const uint8_t *src, int size) | |
| 60 | { | ||
| 61 | ✗ | memcpy(buf, src, size); | |
| 62 | ✗ | return buf + size; | |
| 63 | } | ||
| 64 | |||
| 65 | ✗ | static uint8_t *append_dht_segment(uint8_t *buf) | |
| 66 | { | ||
| 67 | ✗ | buf = append(buf, dht_segment_head, sizeof(dht_segment_head)); | |
| 68 | ✗ | buf = append(buf, ff_mjpeg_bits_dc_luminance + 1, 16); | |
| 69 | ✗ | buf = append(buf, dht_segment_frag, sizeof(dht_segment_frag)); | |
| 70 | ✗ | buf = append(buf, ff_mjpeg_val_dc, 12); | |
| 71 | ✗ | *(buf++) = 0x10; | |
| 72 | ✗ | buf = append(buf, ff_mjpeg_bits_ac_luminance + 1, 16); | |
| 73 | ✗ | buf = append(buf, ff_mjpeg_val_ac_luminance, 162); | |
| 74 | ✗ | *(buf++) = 0x11; | |
| 75 | ✗ | buf = append(buf, ff_mjpeg_bits_ac_chrominance + 1, 16); | |
| 76 | ✗ | buf = append(buf, ff_mjpeg_val_ac_chrominance, 162); | |
| 77 | ✗ | return buf; | |
| 78 | } | ||
| 79 | |||
| 80 | ✗ | static int mjpeg2jpeg_filter(AVBSFContext *ctx, AVPacket *out) | |
| 81 | { | ||
| 82 | AVPacket *in; | ||
| 83 | ✗ | int ret = 0; | |
| 84 | int input_skip, output_size; | ||
| 85 | uint8_t *output; | ||
| 86 | |||
| 87 | ✗ | ret = ff_bsf_get_packet(ctx, &in); | |
| 88 | ✗ | if (ret < 0) | |
| 89 | ✗ | return ret; | |
| 90 | |||
| 91 | ✗ | if (in->size < 12) { | |
| 92 | ✗ | av_log(ctx, AV_LOG_ERROR, "input is truncated\n"); | |
| 93 | ✗ | ret = AVERROR_INVALIDDATA; | |
| 94 | ✗ | goto fail; | |
| 95 | } | ||
| 96 | ✗ | if (AV_RB16(in->data) != 0xffd8) { | |
| 97 | ✗ | av_log(ctx, AV_LOG_ERROR, "input is not MJPEG\n"); | |
| 98 | ✗ | ret = AVERROR_INVALIDDATA; | |
| 99 | ✗ | goto fail; | |
| 100 | } | ||
| 101 | ✗ | if (in->data[2] == 0xff && in->data[3] == APP0) { | |
| 102 | ✗ | input_skip = (in->data[4] << 8) + in->data[5] + 4; | |
| 103 | } else { | ||
| 104 | ✗ | input_skip = 2; | |
| 105 | } | ||
| 106 | ✗ | if (in->size < input_skip) { | |
| 107 | ✗ | av_log(ctx, AV_LOG_ERROR, "input is truncated\n"); | |
| 108 | ✗ | ret = AVERROR_INVALIDDATA; | |
| 109 | ✗ | goto fail; | |
| 110 | } | ||
| 111 | ✗ | output_size = in->size - input_skip + | |
| 112 | ✗ | sizeof(jpeg_header) + dht_segment_size; | |
| 113 | ✗ | ret = av_new_packet(out, output_size); | |
| 114 | ✗ | if (ret < 0) | |
| 115 | ✗ | goto fail; | |
| 116 | |||
| 117 | ✗ | output = out->data; | |
| 118 | |||
| 119 | ✗ | output = append(output, jpeg_header, sizeof(jpeg_header)); | |
| 120 | ✗ | output = append_dht_segment(output); | |
| 121 | ✗ | output = append(output, in->data + input_skip, in->size - input_skip); | |
| 122 | |||
| 123 | ✗ | ret = av_packet_copy_props(out, in); | |
| 124 | ✗ | if (ret < 0) | |
| 125 | ✗ | goto fail; | |
| 126 | |||
| 127 | ✗ | fail: | |
| 128 | ✗ | if (ret < 0) | |
| 129 | ✗ | av_packet_unref(out); | |
| 130 | ✗ | av_packet_free(&in); | |
| 131 | ✗ | return ret; | |
| 132 | } | ||
| 133 | |||
| 134 | static const enum AVCodecID codec_ids[] = { | ||
| 135 | AV_CODEC_ID_MJPEG, AV_CODEC_ID_NONE, | ||
| 136 | }; | ||
| 137 | |||
| 138 | const FFBitStreamFilter ff_mjpeg2jpeg_bsf = { | ||
| 139 | .p.name = "mjpeg2jpeg", | ||
| 140 | .p.codec_ids = codec_ids, | ||
| 141 | .filter = mjpeg2jpeg_filter, | ||
| 142 | }; | ||
| 143 |