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Support uncompressed 16 bit sgi image format, as e.g. used by the files at

Browse Source 
http://media.xiph.org/svt/2160p50_CgrLevels_Master_SVTdec05_/1_CrowdRun_2160p50_CgrLevels_MASTER_SVTdec05_/

Originally committed as revision 19926 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Reimar Döffinger 2009-09-19 11:42:41 +00:00
parent bdb156c7b1
commit fbc030045c
1 changed files with 11 additions and 9 deletions
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20
libavcodec/sgidec.c
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@ -28,6 +28,7 @@ typedef struct SgiState {
unsigned int width;
unsigned int height;
unsigned int depth;
unsigned int bytes_per_channel;
int linesize;
} SgiState;
@ -125,7 +126,7 @@ static int read_uncompressed_sgi(unsigned char* out_buf, uint8_t* out_end,
{
int x, y, z;
const uint8_t *ptr;
unsigned int offset = s->height * s->width;
unsigned int offset = s->height * s->width * s->bytes_per_channel;
/* Test buffer size. */
if (offset * s->depth > in_end - in_buf) {
@ -135,9 +136,10 @@ static int read_uncompressed_sgi(unsigned char* out_buf, uint8_t* out_end,
for (y = s->height - 1; y >= 0; y--) {
out_end = out_buf + (y * s->linesize);
for (x = s->width; x > 0; x--) {
ptr = in_buf++;
ptr = in_buf += s->bytes_per_channel;
for(z = 0; z < s->depth; z ++) {
bytestream_put_byte(&out_end, *ptr);
memcpy(out_end, ptr, s->bytes_per_channel);
out_end += s->bytes_per_channel;
ptr += offset;
}
}
@ -155,7 +157,7 @@ static int decode_frame(AVCodecContext *avctx,
AVFrame *picture = data;
AVFrame *p = &s->picture;
const uint8_t *in_end = in_buf + buf_size;
unsigned int dimension, bytes_per_channel, rle;
unsigned int dimension, rle;
int ret = 0;
uint8_t *out_buf, *out_end;
@ -171,13 +173,13 @@ static int decode_frame(AVCodecContext *avctx,
}
rle = bytestream_get_byte(&in_buf);
bytes_per_channel = bytestream_get_byte(&in_buf);
s->bytes_per_channel = bytestream_get_byte(&in_buf);
dimension = bytestream_get_be16(&in_buf);
s->width = bytestream_get_be16(&in_buf);
s->height = bytestream_get_be16(&in_buf);
s->depth = bytestream_get_be16(&in_buf);
if (bytes_per_channel != 1) {
if (s->bytes_per_channel != 1 && (s->bytes_per_channel != 2 || rle)) {
av_log(avctx, AV_LOG_ERROR, "wrong channel number\n");
return -1;
}
@ -189,10 +191,10 @@ static int decode_frame(AVCodecContext *avctx,
}
if (s->depth == SGI_GRAYSCALE) {
avctx->pix_fmt = PIX_FMT_GRAY8;
avctx->pix_fmt = s->bytes_per_channel == 2 ? PIX_FMT_GRAY16BE : PIX_FMT_GRAY8;
} else if (s->depth == SGI_RGB) {
avctx->pix_fmt = PIX_FMT_RGB24;
} else if (s->depth == SGI_RGBA) {
avctx->pix_fmt = s->bytes_per_channel == 2 ? PIX_FMT_RGB48BE : PIX_FMT_RGB24;
} else if (s->depth == SGI_RGBA && s->bytes_per_channel == 1) {
avctx->pix_fmt = PIX_FMT_RGBA;
} else {
av_log(avctx, AV_LOG_ERROR, "wrong picture format\n");