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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 6148 | serge | 1 | /* |
| 2 | * MJPEG/AVI1 to JPEG/JFIF bitstream format filter |
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| 3 | * Copyright (c) 2010 Adrian Daerr and Nicolas George |
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| 4 | * |
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| 5 | * This file is part of FFmpeg. |
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| 6 | * |
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| 7 | * FFmpeg is free software; you can redistribute it and/or |
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| 8 | * modify it under the terms of the GNU Lesser General Public |
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| 9 | * License as published by the Free Software Foundation; either |
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| 10 | * version 2.1 of the License, or (at your option) any later version. |
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| 11 | * |
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| 12 | * FFmpeg is distributed in the hope that it will be useful, |
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| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 15 | * Lesser General Public License for more details. |
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| 16 | * |
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| 17 | * You should have received a copy of the GNU Lesser General Public |
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| 18 | * License along with FFmpeg; if not, write to the Free Software |
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| 19 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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| 20 | */ |
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| 21 | |||
| 22 | /* |
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| 23 | * Adapted from mjpeg2jpeg.c, with original copyright: |
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| 24 | * Paris 2010 Adrian Daerr, public domain |
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| 25 | */ |
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| 26 | |||
| 27 | #include |
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| 28 | #include "avcodec.h" |
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| 29 | #include "mjpeg.h" |
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| 30 | |||
| 31 | static const uint8_t jpeg_header[] = { |
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| 32 | 0xff, 0xd8, // SOI |
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| 33 | 0xff, 0xe0, // APP0 |
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| 34 | 0x00, 0x10, // APP0 header size (including |
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| 35 | // this field, but excluding preceding) |
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| 36 | 0x4a, 0x46, 0x49, 0x46, 0x00, // ID string 'JFIF\0' |
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| 37 | 0x01, 0x01, // version |
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| 38 | 0x00, // bits per type |
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| 39 | 0x00, 0x00, // X density |
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| 40 | 0x00, 0x00, // Y density |
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| 41 | 0x00, // X thumbnail size |
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| 42 | 0x00, // Y thumbnail size |
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| 43 | }; |
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| 44 | |||
| 45 | static const int dht_segment_size = 420; |
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| 46 | static const uint8_t dht_segment_head[] = { 0xFF, 0xC4, 0x01, 0xA2, 0x00 }; |
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| 47 | static const uint8_t dht_segment_frag[] = { |
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| 48 | 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, |
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| 49 | 0x0a, 0x0b, 0x01, 0x00, 0x03, 0x01, 0x01, 0x01, 0x01, 0x01, |
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| 50 | 0x01, 0x01, 0x01, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, |
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| 51 | }; |
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| 52 | |||
| 53 | static uint8_t *append(uint8_t *buf, const uint8_t *src, int size) |
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| 54 | { |
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| 55 | memcpy(buf, src, size); |
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| 56 | return buf + size; |
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| 57 | } |
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| 58 | |||
| 59 | static uint8_t *append_dht_segment(uint8_t *buf) |
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| 60 | { |
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| 61 | buf = append(buf, dht_segment_head, sizeof(dht_segment_head)); |
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| 62 | buf = append(buf, avpriv_mjpeg_bits_dc_luminance + 1, 16); |
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| 63 | buf = append(buf, dht_segment_frag, sizeof(dht_segment_frag)); |
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| 64 | buf = append(buf, avpriv_mjpeg_val_dc, 12); |
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| 65 | *(buf++) = 0x10; |
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| 66 | buf = append(buf, avpriv_mjpeg_bits_ac_luminance + 1, 16); |
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| 67 | buf = append(buf, avpriv_mjpeg_val_ac_luminance, 162); |
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| 68 | *(buf++) = 0x11; |
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| 69 | buf = append(buf, avpriv_mjpeg_bits_ac_chrominance + 1, 16); |
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| 70 | buf = append(buf, avpriv_mjpeg_val_ac_chrominance, 162); |
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| 71 | return buf; |
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| 72 | } |
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| 73 | |||
| 74 | static int mjpeg2jpeg_filter(AVBitStreamFilterContext *bsfc, |
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| 75 | AVCodecContext *avctx, const char *args, |
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| 76 | uint8_t **poutbuf, int *poutbuf_size, |
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| 77 | const uint8_t *buf, int buf_size, |
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| 78 | int keyframe) |
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| 79 | { |
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| 80 | int input_skip, output_size; |
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| 81 | uint8_t *output, *out; |
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| 82 | |||
| 83 | if (buf_size < 12) { |
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| 84 | av_log(avctx, AV_LOG_ERROR, "input is truncated\n"); |
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| 85 | return AVERROR_INVALIDDATA; |
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| 86 | } |
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| 87 | if (memcmp("AVI1", buf + 6, 4)) { |
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| 88 | av_log(avctx, AV_LOG_ERROR, "input is not MJPEG/AVI1\n"); |
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| 89 | return AVERROR_INVALIDDATA; |
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| 90 | } |
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| 91 | input_skip = (buf[4] << 8) + buf[5] + 4; |
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| 92 | if (buf_size < input_skip) { |
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| 93 | av_log(avctx, AV_LOG_ERROR, "input is truncated\n"); |
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| 94 | return AVERROR_INVALIDDATA; |
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| 95 | } |
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| 96 | output_size = buf_size - input_skip + |
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| 97 | sizeof(jpeg_header) + dht_segment_size; |
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| 98 | output = out = av_malloc(output_size); |
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| 99 | if (!output) |
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| 100 | return AVERROR(ENOMEM); |
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| 101 | out = append(out, jpeg_header, sizeof(jpeg_header)); |
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| 102 | out = append_dht_segment(out); |
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| 103 | out = append(out, buf + input_skip, buf_size - input_skip); |
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| 104 | *poutbuf = output; |
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| 105 | *poutbuf_size = output_size; |
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| 106 | return 1; |
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| 107 | } |
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| 108 | |||
| 109 | AVBitStreamFilter ff_mjpeg2jpeg_bsf = { |
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| 110 | .name = "mjpeg2jpeg", |
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| 111 | .filter = mjpeg2jpeg_filter, |
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| 112 | }; |