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00038 #include <stdio.h>
00039 #include <stdlib.h>
00040
00041 #include "avcodec.h"
00042 #include "msrledec.h"
00043
00044 #include <zlib.h>
00045
00046
00047
00048
00049
00050 typedef struct TsccContext {
00051
00052 AVCodecContext *avctx;
00053 AVFrame pic;
00054
00055
00056 int bpp;
00057
00058 unsigned int decomp_size;
00059
00060 unsigned char* decomp_buf;
00061 GetByteContext gb;
00062 int height;
00063 z_stream zstream;
00064
00065 uint32_t pal[256];
00066 } CamtasiaContext;
00067
00068
00069
00070
00071
00072
00073 static int decode_frame(AVCodecContext *avctx, void *data, int *data_size, AVPacket *avpkt)
00074 {
00075 const uint8_t *buf = avpkt->data;
00076 int buf_size = avpkt->size;
00077 CamtasiaContext * const c = avctx->priv_data;
00078 const unsigned char *encoded = buf;
00079 int zret;
00080 int len = buf_size;
00081
00082 if(c->pic.data[0])
00083 avctx->release_buffer(avctx, &c->pic);
00084
00085 c->pic.reference = 3;
00086 c->pic.buffer_hints = FF_BUFFER_HINTS_VALID;
00087 if(avctx->get_buffer(avctx, &c->pic) < 0){
00088 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
00089 return -1;
00090 }
00091
00092 zret = inflateReset(&c->zstream);
00093 if (zret != Z_OK) {
00094 av_log(avctx, AV_LOG_ERROR, "Inflate reset error: %d\n", zret);
00095 return -1;
00096 }
00097 c->zstream.next_in = encoded;
00098 c->zstream.avail_in = len;
00099 c->zstream.next_out = c->decomp_buf;
00100 c->zstream.avail_out = c->decomp_size;
00101 zret = inflate(&c->zstream, Z_FINISH);
00102
00103 if ((zret != Z_OK) && (zret != Z_STREAM_END) && (zret != Z_DATA_ERROR)) {
00104 av_log(avctx, AV_LOG_ERROR, "Inflate error: %d\n", zret);
00105 return -1;
00106 }
00107
00108
00109 if (zret != Z_DATA_ERROR) {
00110 bytestream2_init(&c->gb, c->decomp_buf,
00111 c->decomp_size - c->zstream.avail_out);
00112 ff_msrle_decode(avctx, (AVPicture*)&c->pic, c->bpp, &c->gb);
00113 }
00114
00115
00116 if (c->avctx->pix_fmt == PIX_FMT_PAL8) {
00117 const uint8_t *pal = av_packet_get_side_data(avpkt, AV_PKT_DATA_PALETTE, NULL);
00118
00119 if (pal) {
00120 c->pic.palette_has_changed = 1;
00121 memcpy(c->pal, pal, AVPALETTE_SIZE);
00122 }
00123 memcpy(c->pic.data[1], c->pal, AVPALETTE_SIZE);
00124 }
00125
00126 *data_size = sizeof(AVFrame);
00127 *(AVFrame*)data = c->pic;
00128
00129
00130 return buf_size;
00131 }
00132
00133
00134
00135
00136
00137
00138
00139
00140 static av_cold int decode_init(AVCodecContext *avctx)
00141 {
00142 CamtasiaContext * const c = avctx->priv_data;
00143 int zret;
00144
00145 c->avctx = avctx;
00146
00147 c->height = avctx->height;
00148
00149 avcodec_get_frame_defaults(&c->pic);
00150
00151 memset(&c->zstream, 0, sizeof(z_stream));
00152 switch(avctx->bits_per_coded_sample){
00153 case 8: avctx->pix_fmt = PIX_FMT_PAL8; break;
00154 case 16: avctx->pix_fmt = PIX_FMT_RGB555; break;
00155 case 24:
00156 avctx->pix_fmt = PIX_FMT_BGR24;
00157 break;
00158 case 32: avctx->pix_fmt = PIX_FMT_RGB32; break;
00159 default: av_log(avctx, AV_LOG_ERROR, "Camtasia error: unknown depth %i bpp\n", avctx->bits_per_coded_sample);
00160 return -1;
00161 }
00162 c->bpp = avctx->bits_per_coded_sample;
00163
00164 c->decomp_size = (((avctx->width * c->bpp + 7) >> 3) + 3 * avctx->width + 2) * avctx->height + 2;
00165
00166
00167 if (c->decomp_size) {
00168 if ((c->decomp_buf = av_malloc(c->decomp_size)) == NULL) {
00169 av_log(avctx, AV_LOG_ERROR, "Can't allocate decompression buffer.\n");
00170 return 1;
00171 }
00172 }
00173
00174 c->zstream.zalloc = Z_NULL;
00175 c->zstream.zfree = Z_NULL;
00176 c->zstream.opaque = Z_NULL;
00177 zret = inflateInit(&c->zstream);
00178 if (zret != Z_OK) {
00179 av_log(avctx, AV_LOG_ERROR, "Inflate init error: %d\n", zret);
00180 return 1;
00181 }
00182
00183 return 0;
00184 }
00185
00186
00187
00188
00189
00190
00191
00192
00193 static av_cold int decode_end(AVCodecContext *avctx)
00194 {
00195 CamtasiaContext * const c = avctx->priv_data;
00196
00197 av_freep(&c->decomp_buf);
00198
00199 if (c->pic.data[0])
00200 avctx->release_buffer(avctx, &c->pic);
00201 inflateEnd(&c->zstream);
00202
00203 return 0;
00204 }
00205
00206 AVCodec ff_tscc_decoder = {
00207 .name = "camtasia",
00208 .type = AVMEDIA_TYPE_VIDEO,
00209 .id = CODEC_ID_TSCC,
00210 .priv_data_size = sizeof(CamtasiaContext),
00211 .init = decode_init,
00212 .close = decode_end,
00213 .decode = decode_frame,
00214 .capabilities = CODEC_CAP_DR1,
00215 .long_name = NULL_IF_CONFIG_SMALL("TechSmith Screen Capture Codec"),
00216 };