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https://github.com/FFmpeg/FFmpeg.git
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add 1bpp decoding function and extend 4bpp function to
also cover the 2bpp case. Originally committed as revision 15242 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Stefan Gehrer
parent
31296f6eec
commit
bd547403fe
@ -63,31 +63,75 @@ typedef struct QtrleContext {
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} \
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static void qtrle_decode_1bpp(QtrleContext *s, int stream_ptr, int row_ptr, int lines_to_change)
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{
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}
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static void qtrle_decode_2bpp(QtrleContext *s, int stream_ptr, int row_ptr, int lines_to_change)
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{
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}
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static void qtrle_decode_4bpp(QtrleContext *s, int stream_ptr, int row_ptr, int lines_to_change)
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{
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int rle_code;
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int pixel_ptr;
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int pixel_ptr = 0;
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int row_inc = s->frame.linesize[0];
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unsigned char pi1, pi2, pi3, pi4, pi5, pi6, pi7, pi8; /* 8 palette indexes */
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unsigned char pi0, pi1; /* 2 8-pixel values */
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unsigned char *rgb = s->frame.data[0];
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int pixel_limit = s->frame.linesize[0] * s->avctx->height;
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int skip;
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while (lines_to_change) {
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CHECK_STREAM_PTR(2);
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skip = s->buf[stream_ptr++];
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rle_code = (signed char)s->buf[stream_ptr++];
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if (rle_code == 0)
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break;
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if(skip & 0x80) {
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lines_to_change--;
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row_ptr += row_inc;
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pixel_ptr = row_ptr + 2 * (skip & 0x7f);
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} else
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pixel_ptr += 2 * skip;
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CHECK_PIXEL_PTR(0); /* make sure pixel_ptr is positive */
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if (rle_code < 0) {
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/* decode the run length code */
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rle_code = -rle_code;
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/* get the next 2 bytes from the stream, treat them as groups
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* of 8 pixels, and output them rle_code times */
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CHECK_STREAM_PTR(2);
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pi0 = s->buf[stream_ptr++];
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pi1 = s->buf[stream_ptr++];
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CHECK_PIXEL_PTR(rle_code * 2);
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while (rle_code--) {
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rgb[pixel_ptr++] = pi0;
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rgb[pixel_ptr++] = pi1;
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}
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} else {
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/* copy the same pixel directly to output 2 times */
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rle_code *= 2;
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CHECK_STREAM_PTR(rle_code);
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CHECK_PIXEL_PTR(rle_code);
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while (rle_code--)
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rgb[pixel_ptr++] = s->buf[stream_ptr++];
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}
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}
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}
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static inline void qtrle_decode_2n4bpp(QtrleContext *s, int stream_ptr,
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int row_ptr, int lines_to_change, int bpp)
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{
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int rle_code, i;
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int pixel_ptr;
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int row_inc = s->frame.linesize[0];
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unsigned char pi[16]; /* 16 palette indices */
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unsigned char *rgb = s->frame.data[0];
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int pixel_limit = s->frame.linesize[0] * s->avctx->height;
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int num_pixels = (bpp == 4) ? 8 : 16;
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while (lines_to_change--) {
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CHECK_STREAM_PTR(2);
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pixel_ptr = row_ptr + (8 * (s->buf[stream_ptr++] - 1));
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pixel_ptr = row_ptr + (num_pixels * (s->buf[stream_ptr++] - 1));
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while ((rle_code = (signed char)s->buf[stream_ptr++]) != -1) {
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if (rle_code == 0) {
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/* there's another skip code in the stream */
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CHECK_STREAM_PTR(1);
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pixel_ptr += (8 * (s->buf[stream_ptr++] - 1));
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pixel_ptr += (num_pixels * (s->buf[stream_ptr++] - 1));
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CHECK_PIXEL_PTR(0); /* make sure pixel_ptr is positive */
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} else if (rle_code < 0) {
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/* decode the run length code */
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@ -95,36 +139,30 @@ static void qtrle_decode_4bpp(QtrleContext *s, int stream_ptr, int row_ptr, int
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/* get the next 4 bytes from the stream, treat them as palette
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* indexes, and output them rle_code times */
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CHECK_STREAM_PTR(4);
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pi1 = ((s->buf[stream_ptr]) >> 4) & 0x0f;
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pi2 = (s->buf[stream_ptr++]) & 0x0f;
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pi3 = ((s->buf[stream_ptr]) >> 4) & 0x0f;
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pi4 = (s->buf[stream_ptr++]) & 0x0f;
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pi5 = ((s->buf[stream_ptr]) >> 4) & 0x0f;
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pi6 = (s->buf[stream_ptr++]) & 0x0f;
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pi7 = ((s->buf[stream_ptr]) >> 4) & 0x0f;
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pi8 = (s->buf[stream_ptr++]) & 0x0f;
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CHECK_PIXEL_PTR(rle_code * 8);
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for (i = num_pixels-1; i >= 0; i--) {
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pi[num_pixels-1-i] = (s->buf[stream_ptr] >> ((i*bpp) & 0x07)) & ((1<<bpp)-1);
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stream_ptr+= ((i & ((num_pixels>>2)-1)) == 0);
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}
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CHECK_PIXEL_PTR(rle_code * num_pixels);
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while (rle_code--) {
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rgb[pixel_ptr++] = pi1;
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rgb[pixel_ptr++] = pi2;
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rgb[pixel_ptr++] = pi3;
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rgb[pixel_ptr++] = pi4;
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rgb[pixel_ptr++] = pi5;
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rgb[pixel_ptr++] = pi6;
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rgb[pixel_ptr++] = pi7;
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rgb[pixel_ptr++] = pi8;
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for (i = 0; i < num_pixels; i++)
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rgb[pixel_ptr++] = pi[i];
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}
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} else {
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/* copy the same pixel directly to output 4 times */
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rle_code *= 4;
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CHECK_STREAM_PTR(rle_code);
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CHECK_PIXEL_PTR(rle_code*2);
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CHECK_PIXEL_PTR(rle_code*(num_pixels>>2));
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while (rle_code--) {
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rgb[pixel_ptr++] = ((s->buf[stream_ptr]) >> 4) & 0x0f;
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rgb[pixel_ptr++] = (s->buf[stream_ptr++]) & 0x0f;
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if(bpp == 4) {
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rgb[pixel_ptr++] = ((s->buf[stream_ptr]) >> 4) & 0x0f;
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rgb[pixel_ptr++] = (s->buf[stream_ptr++]) & 0x0f;
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} else {
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rgb[pixel_ptr++] = ((s->buf[stream_ptr]) >> 6) & 0x03;
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rgb[pixel_ptr++] = ((s->buf[stream_ptr]) >> 4) & 0x03;
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rgb[pixel_ptr++] = ((s->buf[stream_ptr]) >> 2) & 0x03;
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rgb[pixel_ptr++] = (s->buf[stream_ptr++]) & 0x03;
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}
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}
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}
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}
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@ -347,10 +385,13 @@ static av_cold int qtrle_decode_init(AVCodecContext *avctx)
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s->avctx = avctx;
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switch (avctx->bits_per_sample) {
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case 1:
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case 33:
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avctx->pix_fmt = PIX_FMT_MONOWHITE;
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break;
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case 2:
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case 4:
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case 8:
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case 33:
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case 34:
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case 36:
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case 40:
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@ -387,6 +428,7 @@ static int qtrle_decode_frame(AVCodecContext *avctx,
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QtrleContext *s = avctx->priv_data;
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int header, start_line;
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int stream_ptr, height, row_ptr;
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int has_palette = 0;
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s->buf = buf;
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s->size = buf_size;
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@ -432,29 +474,20 @@ static int qtrle_decode_frame(AVCodecContext *avctx,
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case 2:
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case 34:
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qtrle_decode_2bpp(s, stream_ptr, row_ptr, height);
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qtrle_decode_2n4bpp(s, stream_ptr, row_ptr, height, 2);
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has_palette = 1;
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break;
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case 4:
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case 36:
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qtrle_decode_4bpp(s, stream_ptr, row_ptr, height);
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/* make the palette available on the way out */
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memcpy(s->frame.data[1], s->avctx->palctrl->palette, AVPALETTE_SIZE);
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if (s->avctx->palctrl->palette_changed) {
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s->frame.palette_has_changed = 1;
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s->avctx->palctrl->palette_changed = 0;
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}
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qtrle_decode_2n4bpp(s, stream_ptr, row_ptr, height, 4);
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has_palette = 1;
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break;
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case 8:
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case 40:
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qtrle_decode_8bpp(s, stream_ptr, row_ptr, height);
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/* make the palette available on the way out */
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memcpy(s->frame.data[1], s->avctx->palctrl->palette, AVPALETTE_SIZE);
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if (s->avctx->palctrl->palette_changed) {
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s->frame.palette_has_changed = 1;
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s->avctx->palctrl->palette_changed = 0;
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}
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has_palette = 1;
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break;
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case 16:
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@ -474,6 +507,16 @@ static int qtrle_decode_frame(AVCodecContext *avctx,
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avctx->bits_per_sample);
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break;
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}
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if(has_palette) {
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/* make the palette available on the way out */
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memcpy(s->frame.data[1], s->avctx->palctrl->palette, AVPALETTE_SIZE);
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if (s->avctx->palctrl->palette_changed) {
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s->frame.palette_has_changed = 1;
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s->avctx->palctrl->palette_changed = 0;
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}
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}
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done:
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*data_size = sizeof(AVFrame);
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*(AVFrame*)data = s->frame;
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