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00031 #include <stdio.h>
00032 #include <stdlib.h>
00033 #include <string.h>
00034
00035 #include "avcodec.h"
00036 #include "dsputil.h"
00037 #include "msrledec.h"
00038
00039 typedef struct MsrleContext {
00040 AVCodecContext *avctx;
00041 AVFrame frame;
00042
00043 const unsigned char *buf;
00044 int size;
00045
00046 uint32_t pal[256];
00047 } MsrleContext;
00048
00049 static av_cold int msrle_decode_init(AVCodecContext *avctx)
00050 {
00051 MsrleContext *s = avctx->priv_data;
00052
00053 s->avctx = avctx;
00054
00055 switch (avctx->bits_per_coded_sample) {
00056 case 4:
00057 case 8:
00058 avctx->pix_fmt = PIX_FMT_PAL8;
00059 break;
00060 case 24:
00061 avctx->pix_fmt = PIX_FMT_BGR24;
00062 break;
00063 default:
00064 av_log(avctx, AV_LOG_ERROR, "unsupported bits per sample\n");
00065 return -1;
00066 }
00067
00068 s->frame.data[0] = NULL;
00069
00070 return 0;
00071 }
00072
00073 static int msrle_decode_frame(AVCodecContext *avctx,
00074 void *data, int *data_size,
00075 AVPacket *avpkt)
00076 {
00077 const uint8_t *buf = avpkt->data;
00078 int buf_size = avpkt->size;
00079 MsrleContext *s = avctx->priv_data;
00080 int istride = FFALIGN(avctx->width*avctx->bits_per_coded_sample, 32) / 8;
00081
00082 s->buf = buf;
00083 s->size = buf_size;
00084
00085 s->frame.reference = 1;
00086 s->frame.buffer_hints = FF_BUFFER_HINTS_VALID | FF_BUFFER_HINTS_PRESERVE | FF_BUFFER_HINTS_REUSABLE;
00087 if (avctx->reget_buffer(avctx, &s->frame)) {
00088 av_log(avctx, AV_LOG_ERROR, "reget_buffer() failed\n");
00089 return -1;
00090 }
00091
00092 if (avctx->bits_per_coded_sample <= 8) {
00093 const uint8_t *pal = av_packet_get_side_data(avpkt, AV_PKT_DATA_PALETTE, NULL);
00094
00095 if (pal) {
00096 s->frame.palette_has_changed = 1;
00097 memcpy(s->pal, pal, AVPALETTE_SIZE);
00098 }
00099
00100
00101 memcpy(s->frame.data[1], s->pal, AVPALETTE_SIZE);
00102 }
00103
00104
00105 if (avctx->height * istride == avpkt->size) {
00106 int linesize = avctx->width * avctx->bits_per_coded_sample / 8;
00107 uint8_t *ptr = s->frame.data[0];
00108 uint8_t *buf = avpkt->data + (avctx->height-1)*istride;
00109 int i, j;
00110
00111 for (i = 0; i < avctx->height; i++) {
00112 if (avctx->bits_per_coded_sample == 4) {
00113 for (j = 0; j < avctx->width - 1; j += 2) {
00114 ptr[j+0] = buf[j>>1] >> 4;
00115 ptr[j+1] = buf[j>>1] & 0xF;
00116 }
00117 if (avctx->width & 1)
00118 ptr[j+0] = buf[j>>1] >> 4;
00119 } else {
00120 memcpy(ptr, buf, linesize);
00121 }
00122 buf -= istride;
00123 ptr += s->frame.linesize[0];
00124 }
00125 } else {
00126 ff_msrle_decode(avctx, (AVPicture*)&s->frame, avctx->bits_per_coded_sample, buf, buf_size);
00127 }
00128
00129 *data_size = sizeof(AVFrame);
00130 *(AVFrame*)data = s->frame;
00131
00132
00133 return buf_size;
00134 }
00135
00136 static av_cold int msrle_decode_end(AVCodecContext *avctx)
00137 {
00138 MsrleContext *s = avctx->priv_data;
00139
00140
00141 if (s->frame.data[0])
00142 avctx->release_buffer(avctx, &s->frame);
00143
00144 return 0;
00145 }
00146
00147 AVCodec ff_msrle_decoder = {
00148 .name = "msrle",
00149 .type = AVMEDIA_TYPE_VIDEO,
00150 .id = CODEC_ID_MSRLE,
00151 .priv_data_size = sizeof(MsrleContext),
00152 .init = msrle_decode_init,
00153 .close = msrle_decode_end,
00154 .decode = msrle_decode_frame,
00155 .capabilities = CODEC_CAP_DR1,
00156 .long_name= NULL_IF_CONFIG_SMALL("Microsoft RLE"),
00157 };