| Line | Branch | Exec | Source |
|---|---|---|---|
| 1 | /* | ||
| 2 | * TechSmith Camtasia decoder | ||
| 3 | * Copyright (c) 2004 Konstantin Shishkov | ||
| 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 | * @file | ||
| 24 | * TechSmith Camtasia decoder | ||
| 25 | * | ||
| 26 | * Fourcc: TSCC | ||
| 27 | * | ||
| 28 | * Codec is very simple: | ||
| 29 | * it codes picture (picture difference, really) | ||
| 30 | * with algorithm almost identical to Windows RLE8, | ||
| 31 | * only without padding and with greater pixel sizes, | ||
| 32 | * then this coded picture is packed with ZLib | ||
| 33 | * | ||
| 34 | * Supports: BGR8,BGR555,BGR24 - only BGR8 and BGR555 tested | ||
| 35 | */ | ||
| 36 | |||
| 37 | #include "libavutil/mem.h" | ||
| 38 | #include "avcodec.h" | ||
| 39 | #include "codec_internal.h" | ||
| 40 | #include "decode.h" | ||
| 41 | #include "msrledec.h" | ||
| 42 | #include "zlib_wrapper.h" | ||
| 43 | |||
| 44 | #include <zlib.h> | ||
| 45 | |||
| 46 | typedef struct TsccContext { | ||
| 47 | |||
| 48 | AVCodecContext *avctx; | ||
| 49 | AVFrame *frame; | ||
| 50 | |||
| 51 | // Bits per pixel | ||
| 52 | int bpp; | ||
| 53 | // Decompressed data size | ||
| 54 | unsigned int decomp_size; | ||
| 55 | // Decompression buffer | ||
| 56 | unsigned char* decomp_buf; | ||
| 57 | GetByteContext gb; | ||
| 58 | int height; | ||
| 59 | FFZStream zstream; | ||
| 60 | |||
| 61 | uint32_t pal[256]; | ||
| 62 | } CamtasiaContext; | ||
| 63 | |||
| 64 | 407 | static int decode_frame(AVCodecContext *avctx, AVFrame *rframe, | |
| 65 | int *got_frame, AVPacket *avpkt) | ||
| 66 | { | ||
| 67 | 407 | const uint8_t *buf = avpkt->data; | |
| 68 | 407 | int buf_size = avpkt->size; | |
| 69 | 407 | CamtasiaContext * const c = avctx->priv_data; | |
| 70 | 407 | z_stream *const zstream = &c->zstream.zstream; | |
| 71 | 407 | AVFrame *frame = c->frame; | |
| 72 | int ret; | ||
| 73 | 407 | int palette_has_changed = 0; | |
| 74 | |||
| 75 |
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407 | if (c->avctx->pix_fmt == AV_PIX_FMT_PAL8) { |
| 76 | ✗ | palette_has_changed = ff_copy_palette(c->pal, avpkt, avctx); | |
| 77 | } | ||
| 78 | |||
| 79 | 407 | ret = inflateReset(zstream); | |
| 80 |
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407 | if (ret != Z_OK) { |
| 81 | ✗ | av_log(avctx, AV_LOG_ERROR, "Inflate reset error: %d\n", ret); | |
| 82 | ✗ | return AVERROR_UNKNOWN; | |
| 83 | } | ||
| 84 | 407 | zstream->next_in = buf; | |
| 85 | 407 | zstream->avail_in = buf_size; | |
| 86 | 407 | zstream->next_out = c->decomp_buf; | |
| 87 | 407 | zstream->avail_out = c->decomp_size; | |
| 88 | 407 | ret = inflate(zstream, Z_FINISH); | |
| 89 | // Z_DATA_ERROR means empty picture | ||
| 90 |
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407 | if (ret == Z_DATA_ERROR && !palette_has_changed) { |
| 91 | 274 | return buf_size; | |
| 92 | } | ||
| 93 | |||
| 94 |
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133 | if ((ret != Z_OK) && (ret != Z_STREAM_END) && (ret != Z_DATA_ERROR)) { |
| 95 | 1 | av_log(avctx, AV_LOG_ERROR, "Inflate error: %d\n", ret); | |
| 96 | 1 | return AVERROR_UNKNOWN; | |
| 97 | } | ||
| 98 | |||
| 99 |
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132 | if ((ret = ff_reget_buffer(avctx, frame, 0)) < 0) |
| 100 | ✗ | return ret; | |
| 101 | |||
| 102 |
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132 | if (ret != Z_DATA_ERROR) { |
| 103 | 132 | bytestream2_init(&c->gb, c->decomp_buf, | |
| 104 | 132 | c->decomp_size - zstream->avail_out); | |
| 105 | 132 | ff_msrle_decode(avctx, frame, c->bpp, &c->gb); | |
| 106 | } | ||
| 107 | |||
| 108 | /* make the palette available on the way out */ | ||
| 109 |
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132 | if (c->avctx->pix_fmt == AV_PIX_FMT_PAL8) { |
| 110 | ✗ | memcpy(frame->data[1], c->pal, AVPALETTE_SIZE); | |
| 111 | } | ||
| 112 | |||
| 113 |
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132 | if ((ret = av_frame_ref(rframe, frame)) < 0) |
| 114 | ✗ | return ret; | |
| 115 | 132 | *got_frame = 1; | |
| 116 | |||
| 117 | /* always report that the buffer was completely consumed */ | ||
| 118 | 132 | return buf_size; | |
| 119 | } | ||
| 120 | |||
| 121 | 4 | static av_cold int decode_init(AVCodecContext *avctx) | |
| 122 | { | ||
| 123 | 4 | CamtasiaContext * const c = avctx->priv_data; | |
| 124 | |||
| 125 | 4 | c->avctx = avctx; | |
| 126 | |||
| 127 | 4 | c->height = avctx->height; | |
| 128 | |||
| 129 |
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4 | switch(avctx->bits_per_coded_sample){ |
| 130 | ✗ | case 8: avctx->pix_fmt = AV_PIX_FMT_PAL8; break; | |
| 131 | 2 | case 16: avctx->pix_fmt = AV_PIX_FMT_RGB555; break; | |
| 132 | ✗ | case 24: | |
| 133 | ✗ | avctx->pix_fmt = AV_PIX_FMT_BGR24; | |
| 134 | ✗ | break; | |
| 135 | 2 | case 32: avctx->pix_fmt = AV_PIX_FMT_0RGB32; break; | |
| 136 | ✗ | default: av_log(avctx, AV_LOG_ERROR, "Camtasia error: unknown depth %i bpp\n", avctx->bits_per_coded_sample); | |
| 137 | ✗ | return AVERROR_PATCHWELCOME; | |
| 138 | } | ||
| 139 | 4 | c->bpp = avctx->bits_per_coded_sample; | |
| 140 | // buffer size for RLE 'best' case when 2-byte code precedes each pixel and there may be padding after it too | ||
| 141 | 4 | c->decomp_size = (((avctx->width * c->bpp + 7) >> 3) + 3 * avctx->width + 2) * avctx->height + 2; | |
| 142 | |||
| 143 | /* Allocate decompression buffer */ | ||
| 144 |
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4 | if (c->decomp_size) { |
| 145 |
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4 | if (!(c->decomp_buf = av_malloc(c->decomp_size))) { |
| 146 | ✗ | av_log(avctx, AV_LOG_ERROR, "Can't allocate decompression buffer.\n"); | |
| 147 | ✗ | return AVERROR(ENOMEM); | |
| 148 | } | ||
| 149 | } | ||
| 150 | |||
| 151 | 4 | c->frame = av_frame_alloc(); | |
| 152 |
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4 | if (!c->frame) |
| 153 | ✗ | return AVERROR(ENOMEM); | |
| 154 | |||
| 155 | 4 | return ff_inflate_init(&c->zstream, avctx); | |
| 156 | } | ||
| 157 | |||
| 158 | 4 | static av_cold int decode_end(AVCodecContext *avctx) | |
| 159 | { | ||
| 160 | 4 | CamtasiaContext * const c = avctx->priv_data; | |
| 161 | |||
| 162 | 4 | av_freep(&c->decomp_buf); | |
| 163 | 4 | av_frame_free(&c->frame); | |
| 164 | 4 | ff_inflate_end(&c->zstream); | |
| 165 | |||
| 166 | 4 | return 0; | |
| 167 | } | ||
| 168 | |||
| 169 | const FFCodec ff_tscc_decoder = { | ||
| 170 | .p.name = "camtasia", | ||
| 171 | CODEC_LONG_NAME("TechSmith Screen Capture Codec"), | ||
| 172 | .p.type = AVMEDIA_TYPE_VIDEO, | ||
| 173 | .p.id = AV_CODEC_ID_TSCC, | ||
| 174 | .priv_data_size = sizeof(CamtasiaContext), | ||
| 175 | .init = decode_init, | ||
| 176 | .close = decode_end, | ||
| 177 | FF_CODEC_DECODE_CB(decode_frame), | ||
| 178 | .p.capabilities = AV_CODEC_CAP_DR1, | ||
| 179 | .caps_internal = FF_CODEC_CAP_INIT_CLEANUP, | ||
| 180 | }; | ||
| 181 |