| Line | Branch | Exec | Source |
|---|---|---|---|
| 1 | /* | ||
| 2 | * Aura 2 decoder | ||
| 3 | * | ||
| 4 | * This file is part of FFmpeg. | ||
| 5 | * | ||
| 6 | * FFmpeg is free software; you can redistribute it and/or | ||
| 7 | * modify it under the terms of the GNU Lesser General Public | ||
| 8 | * License as published by the Free Software Foundation; either | ||
| 9 | * version 2.1 of the License, or (at your option) any later version. | ||
| 10 | * | ||
| 11 | * FFmpeg is distributed in the hope that it will be useful, | ||
| 12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
| 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | ||
| 14 | * Lesser General Public License for more details. | ||
| 15 | * | ||
| 16 | * You should have received a copy of the GNU Lesser General Public | ||
| 17 | * License along with FFmpeg; if not, write to the Free Software | ||
| 18 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | ||
| 19 | */ | ||
| 20 | |||
| 21 | /** | ||
| 22 | * @file | ||
| 23 | * Aura 2 decoder | ||
| 24 | */ | ||
| 25 | |||
| 26 | #include "avcodec.h" | ||
| 27 | #include "codec_internal.h" | ||
| 28 | #include "decode.h" | ||
| 29 | #include "libavutil/internal.h" | ||
| 30 | |||
| 31 | 2 | static av_cold int aura_decode_init(AVCodecContext *avctx) | |
| 32 | { | ||
| 33 | /* width needs to be divisible by 4 for this codec to work */ | ||
| 34 |
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2 | if (avctx->width & 0x3) |
| 35 | ✗ | return AVERROR(EINVAL); | |
| 36 | 2 | avctx->pix_fmt = AV_PIX_FMT_YUV422P; | |
| 37 | |||
| 38 | 2 | return 0; | |
| 39 | } | ||
| 40 | |||
| 41 | 2 | static int aura_decode_frame(AVCodecContext *avctx, AVFrame *frame, | |
| 42 | int *got_frame, AVPacket *pkt) | ||
| 43 | { | ||
| 44 | uint8_t *Y, *U, *V; | ||
| 45 | uint8_t val; | ||
| 46 | int x, y, ret; | ||
| 47 | 2 | const uint8_t *buf = pkt->data; | |
| 48 | |||
| 49 | /* prediction error tables (make it clear that they are signed values) */ | ||
| 50 | 2 | const int8_t *delta_table = (const int8_t*)buf + 16; | |
| 51 | |||
| 52 |
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2 | if (pkt->size != 48 + avctx->height * avctx->width) { |
| 53 | ✗ | av_log(avctx, AV_LOG_ERROR, "got a buffer with %d bytes when %d were expected\n", | |
| 54 | ✗ | pkt->size, 48 + avctx->height * avctx->width); | |
| 55 | ✗ | return AVERROR_INVALIDDATA; | |
| 56 | } | ||
| 57 | |||
| 58 | /* pixel data starts 48 bytes in, after 3x16-byte tables */ | ||
| 59 | 2 | buf += 48; | |
| 60 | |||
| 61 |
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2 | if ((ret = ff_get_buffer(avctx, frame, 0)) < 0) |
| 62 | ✗ | return ret; | |
| 63 | |||
| 64 | 2 | Y = frame->data[0]; | |
| 65 | 2 | U = frame->data[1]; | |
| 66 | 2 | V = frame->data[2]; | |
| 67 | |||
| 68 | /* iterate through each line in the height */ | ||
| 69 |
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362 | for (y = 0; y < avctx->height; y++) { |
| 70 | /* reset predictors */ | ||
| 71 | 360 | val = *buf++; | |
| 72 | 360 | U[0] = val & 0xF0; | |
| 73 | 360 | Y[0] = val << 4; | |
| 74 | 360 | val = *buf++; | |
| 75 | 360 | V[0] = val & 0xF0; | |
| 76 | 360 | Y[1] = Y[0] + delta_table[val & 0xF]; | |
| 77 | 360 | Y += 2; U++; V++; | |
| 78 | |||
| 79 | /* iterate through the remaining pixel groups (4 pixels/group) */ | ||
| 80 |
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57600 | for (x = 1; x < (avctx->width >> 1); x++) { |
| 81 | 57240 | val = *buf++; | |
| 82 | 57240 | U[0] = U[-1] + delta_table[val >> 4]; | |
| 83 | 57240 | Y[0] = Y[-1] + delta_table[val & 0xF]; | |
| 84 | 57240 | val = *buf++; | |
| 85 | 57240 | V[0] = V[-1] + delta_table[val >> 4]; | |
| 86 | 57240 | Y[1] = Y[ 0] + delta_table[val & 0xF]; | |
| 87 | 57240 | Y += 2; U++; V++; | |
| 88 | } | ||
| 89 | 360 | Y += frame->linesize[0] - avctx->width; | |
| 90 | 360 | U += frame->linesize[1] - (avctx->width >> 1); | |
| 91 | 360 | V += frame->linesize[2] - (avctx->width >> 1); | |
| 92 | } | ||
| 93 | |||
| 94 | 2 | *got_frame = 1; | |
| 95 | |||
| 96 | 2 | return pkt->size; | |
| 97 | } | ||
| 98 | |||
| 99 | const FFCodec ff_aura2_decoder = { | ||
| 100 | .p.name = "aura2", | ||
| 101 | CODEC_LONG_NAME("Auravision Aura 2"), | ||
| 102 | .p.type = AVMEDIA_TYPE_VIDEO, | ||
| 103 | .p.id = AV_CODEC_ID_AURA2, | ||
| 104 | .init = aura_decode_init, | ||
| 105 | FF_CODEC_DECODE_CB(aura_decode_frame), | ||
| 106 | .p.capabilities = AV_CODEC_CAP_DR1, | ||
| 107 | }; | ||
| 108 |