X-Git-Url: https://git.sesse.net/?a=blobdiff_plain;f=libavcodec%2Fxan.c;h=7ccc65c007418a83f3836ad7a7ee70d9c5fc1e48;hb=0de9926f62584db587a2a29fc00f6af8e7a34dc1;hp=4dad2e2141d421381c339d2e7faef4f5f62c448a;hpb=9b879566789379631f02b83be367ca55c88a1ae9;p=ffmpeg diff --git a/libavcodec/xan.c b/libavcodec/xan.c index 4dad2e2141d..7ccc65c0074 100644 --- a/libavcodec/xan.c +++ b/libavcodec/xan.c @@ -14,18 +14,17 @@ * * You should have received a copy of the GNU Lesser General Public * License along with this library; if not, write to the Free Software - * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA * */ /** * @file xan.c - * Xan video decoder for Wing Commander III & IV computer games + * Xan video decoder for Wing Commander III computer game * by Mario Brito (mbrito@student.dei.uc.pt) * and Mike Melanson (melanson@pcisys.net) * - * The xan_wc3 decoder outputs the following colorspaces natively: - * PAL8 (default), RGB555, RGB565, RGB24, BGR24, RGBA32, YUV444P + * The xan_wc3 decoder outputs PAL8 data. */ #include @@ -35,86 +34,34 @@ #include "common.h" #include "avcodec.h" -#include "dsputil.h" - -#define PALETTE_COUNT 256 -#define PALETTE_CONTROL_SIZE ((256 * 3) + 1) typedef struct XanContext { AVCodecContext *avctx; - DSPContext dsp; AVFrame last_frame; AVFrame current_frame; unsigned char *buf; int size; - unsigned char palette[PALETTE_COUNT * 4]; - /* scratch space */ unsigned char *buffer1; + int buffer1_size; unsigned char *buffer2; + int buffer2_size; -} XanContext; - -#define BE_16(x) ((((uint8_t*)(x))[0] << 8) | ((uint8_t*)(x))[1]) -#define LE_16(x) ((((uint8_t*)(x))[1] << 8) | ((uint8_t*)(x))[0]) -#define LE_32(x) ((((uint8_t*)(x))[3] << 24) | \ - (((uint8_t*)(x))[2] << 16) | \ - (((uint8_t*)(x))[1] << 8) | \ - ((uint8_t*)(x))[0]) - -/* RGB -> YUV conversion stuff */ -#define SCALEFACTOR 65536 -#define CENTERSAMPLE 128 - -#define COMPUTE_Y(r, g, b) \ - (unsigned char) \ - ((y_r_table[r] + y_g_table[g] + y_b_table[b]) / SCALEFACTOR) -#define COMPUTE_U(r, g, b) \ - (unsigned char) \ - ((u_r_table[r] + u_g_table[g] + u_b_table[b]) / SCALEFACTOR + CENTERSAMPLE) -#define COMPUTE_V(r, g, b) \ - (unsigned char) \ - ((v_r_table[r] + v_g_table[g] + v_b_table[b]) / SCALEFACTOR + CENTERSAMPLE) - -#define Y_R (SCALEFACTOR * 0.29900) -#define Y_G (SCALEFACTOR * 0.58700) -#define Y_B (SCALEFACTOR * 0.11400) - -#define U_R (SCALEFACTOR * -0.16874) -#define U_G (SCALEFACTOR * -0.33126) -#define U_B (SCALEFACTOR * 0.50000) - -#define V_R (SCALEFACTOR * 0.50000) -#define V_G (SCALEFACTOR * -0.41869) -#define V_B (SCALEFACTOR * -0.08131) - -/* - * Precalculate all of the YUV tables since it requires fewer than - * 10 kilobytes to store them. - */ -static int y_r_table[256]; -static int y_g_table[256]; -static int y_b_table[256]; - -static int u_r_table[256]; -static int u_g_table[256]; -static int u_b_table[256]; + int frame_size; -static int v_r_table[256]; -static int v_g_table[256]; -static int v_b_table[256]; +} XanContext; static int xan_decode_init(AVCodecContext *avctx) { XanContext *s = avctx->priv_data; - int i; s->avctx = avctx; + s->frame_size = 0; - if ((avctx->codec->id == CODEC_ID_XAN_WC3) && + if ((avctx->codec->id == CODEC_ID_XAN_WC3) && (s->avctx->palctrl == NULL)) { av_log(avctx, AV_LOG_ERROR, " WC3 Xan video: palette expected.\n"); return -1; @@ -122,32 +69,21 @@ static int xan_decode_init(AVCodecContext *avctx) avctx->pix_fmt = PIX_FMT_PAL8; avctx->has_b_frames = 0; - dsputil_init(&s->dsp, avctx); - - /* initialize the RGB -> YUV tables */ - for (i = 0; i < 256; i++) { - y_r_table[i] = Y_R * i; - y_g_table[i] = Y_G * i; - y_b_table[i] = Y_B * i; - u_r_table[i] = U_R * i; - u_g_table[i] = U_G * i; - u_b_table[i] = U_B * i; - - v_r_table[i] = V_R * i; - v_g_table[i] = V_G * i; - v_b_table[i] = V_B * i; - } + if(avcodec_check_dimensions(avctx, avctx->width, avctx->height)) + return -1; - s->buffer1 = av_malloc(avctx->width * avctx->height); - s->buffer2 = av_malloc(avctx->width * avctx->height); + s->buffer1_size = avctx->width * avctx->height; + s->buffer1 = av_malloc(s->buffer1_size); + s->buffer2_size = avctx->width * avctx->height; + s->buffer2 = av_malloc(s->buffer2_size); if (!s->buffer1 || !s->buffer2) return -1; return 0; } -/* This function is used in lieu of memcpy(). This decoder can not use +/* This function is used in lieu of memcpy(). This decoder can not use * memcpy because the memory locations often overlap and * memcpy doesn't like that; it's not uncommon, for example, for * dest = src+1, to turn byte A into pattern AAAAAAAA. @@ -160,13 +96,15 @@ static inline void bytecopy(unsigned char *dest, unsigned char *src, int count) dest[i] = src[i]; } -static int xan_huffman_decode(unsigned char *dest, unsigned char *src) +static int xan_huffman_decode(unsigned char *dest, unsigned char *src, + int dest_len) { unsigned char byte = *src++; unsigned char ival = byte + 0x16; unsigned char * ptr = src + byte*2; unsigned char val = ival; int counter = 0; + unsigned char *dest_end = dest + dest_len; unsigned char bits = *ptr++; @@ -177,6 +115,8 @@ static int xan_huffman_decode(unsigned char *dest, unsigned char *src) val = src[val - 0x17]; if ( val < 0x16 ) { + if (dest + 1 > dest_end) + return 0; *dest++ = val; val = ival; } @@ -190,12 +130,13 @@ static int xan_huffman_decode(unsigned char *dest, unsigned char *src) return 0; } -static void xan_unpack(unsigned char *dest, unsigned char *src) +static void xan_unpack(unsigned char *dest, unsigned char *src, int dest_len) { unsigned char opcode; int size; int offset; int byte1, byte2, byte3; + unsigned char *dest_end = dest + dest_len; for (;;) { opcode = *src++; @@ -205,9 +146,13 @@ static void xan_unpack(unsigned char *dest, unsigned char *src) offset = *src++; size = opcode & 3; + if (dest + size > dest_end) + return; bytecopy(dest, src, size); dest += size; src += size; size = ((opcode & 0x1c) >> 2) + 3; + if (dest + size > dest_end) + return; bytecopy (dest, dest - (((opcode & 0x60) << 3) + offset + 1), size); dest += size; @@ -217,9 +162,13 @@ static void xan_unpack(unsigned char *dest, unsigned char *src) byte2 = *src++; size = byte1 >> 6; + if (dest + size > dest_end) + return; bytecopy (dest, src, size); dest += size; src += size; size = (opcode & 0x3f) + 4; + if (dest + size > dest_end) + return; bytecopy (dest, dest - (((byte1 & 0x3f) << 8) + byte2 + 1), size); dest += size; @@ -230,9 +179,13 @@ static void xan_unpack(unsigned char *dest, unsigned char *src) byte3 = *src++; size = opcode & 3; + if (dest + size > dest_end) + return; bytecopy (dest, src, size); dest += size; src += size; size = byte3 + 5 + ((opcode & 0xc) << 6); + if (dest + size > dest_end) + return; bytecopy (dest, dest - ((((opcode & 0x10) >> 4) << 0x10) + 1 + (byte1 << 8) + byte2), size); @@ -243,6 +196,8 @@ static void xan_unpack(unsigned char *dest, unsigned char *src) if (size > 0x70) break; + if (dest + size > dest_end) + return; bytecopy (dest, src, size); dest += size; src += size; } } @@ -251,106 +206,7 @@ static void xan_unpack(unsigned char *dest, unsigned char *src) bytecopy(dest, src, size); dest += size; src += size; } -static void inline xan_wc3_build_palette(XanContext *s, - unsigned int *palette_data) -{ - int i; - unsigned char r, g, b; - unsigned short *palette16; - unsigned int *palette32; - unsigned int pal_elem; - - /* transform the palette passed through the palette control structure - * into the necessary internal format depending on colorspace */ - - switch (s->avctx->pix_fmt) { - - case PIX_FMT_RGB555: - palette16 = (unsigned short *)s->palette; - for (i = 0; i < PALETTE_COUNT; i++) { - pal_elem = palette_data[i]; - r = (pal_elem >> 16) & 0xff; - g = (pal_elem >> 8) & 0xff; - b = pal_elem & 0xff; - palette16[i] = - ((r >> 3) << 10) | - ((g >> 3) << 5) | - ((b >> 3) << 0); - } - break; - - case PIX_FMT_RGB565: - palette16 = (unsigned short *)s->palette; - for (i = 0; i < PALETTE_COUNT; i++) { - pal_elem = palette_data[i]; - r = (pal_elem >> 16) & 0xff; - g = (pal_elem >> 8) & 0xff; - b = pal_elem & 0xff; - palette16[i] = - ((r >> 3) << 11) | - ((g >> 2) << 5) | - ((b >> 3) << 0); - } - break; - - case PIX_FMT_RGB24: - for (i = 0; i < PALETTE_COUNT; i++) { - pal_elem = palette_data[i]; - r = (pal_elem >> 16) & 0xff; - g = (pal_elem >> 8) & 0xff; - b = pal_elem & 0xff; - s->palette[i * 4 + 0] = r; - s->palette[i * 4 + 1] = g; - s->palette[i * 4 + 2] = b; - } - break; - - case PIX_FMT_BGR24: - for (i = 0; i < PALETTE_COUNT; i++) { - pal_elem = palette_data[i]; - r = (pal_elem >> 16) & 0xff; - g = (pal_elem >> 8) & 0xff; - b = pal_elem & 0xff; - s->palette[i * 4 + 0] = b; - s->palette[i * 4 + 1] = g; - s->palette[i * 4 + 2] = r; - } - break; - - case PIX_FMT_PAL8: - case PIX_FMT_RGBA32: - palette32 = (unsigned int *)s->palette; - memcpy (palette32, palette_data, PALETTE_COUNT * sizeof(unsigned int)); - break; - - case PIX_FMT_YUV444P: - for (i = 0; i < PALETTE_COUNT; i++) { - pal_elem = palette_data[i]; - r = (pal_elem >> 16) & 0xff; - g = (pal_elem >> 8) & 0xff; - b = pal_elem & 0xff; - s->palette[i * 4 + 0] = COMPUTE_Y(r, g, b); - s->palette[i * 4 + 1] = COMPUTE_U(r, g, b); - s->palette[i * 4 + 2] = COMPUTE_V(r, g, b); - } - break; - - default: - av_log(s->avctx, AV_LOG_ERROR, " Xan WC3: Unhandled colorspace\n"); - break; - } -} - -/* advance current_x variable; reset accounting variables if current_x - * moves beyond width */ -#define ADVANCE_CURRENT_X() \ - current_x++; \ - if (current_x >= width) { \ - index += line_inc; \ - current_x = 0; \ - } - -static void inline xan_wc3_output_pixel_run(XanContext *s, +static void inline xan_wc3_output_pixel_run(XanContext *s, unsigned char *pixel_buffer, int x, int y, int pixel_count) { int stride; @@ -358,125 +214,28 @@ static void inline xan_wc3_output_pixel_run(XanContext *s, int index; int current_x; int width = s->avctx->width; - unsigned char pix; unsigned char *palette_plane; - unsigned char *y_plane; - unsigned char *u_plane; - unsigned char *v_plane; - unsigned char *rgb_plane; - unsigned short *rgb16_plane; - unsigned short *palette16; - unsigned int *rgb32_plane; - unsigned int *palette32; - - switch (s->avctx->pix_fmt) { - - case PIX_FMT_PAL8: - palette_plane = s->current_frame.data[0]; - stride = s->current_frame.linesize[0]; - line_inc = stride - width; - index = y * stride + x; - current_x = x; - while(pixel_count--) { - - /* don't do a memcpy() here; keyframes generally copy an entire - * frame of data and the stride needs to be accounted for */ - palette_plane[index++] = *pixel_buffer++; - - ADVANCE_CURRENT_X(); - } - break; - - case PIX_FMT_RGB555: - case PIX_FMT_RGB565: - rgb16_plane = (unsigned short *)s->current_frame.data[0]; - palette16 = (unsigned short *)s->palette; - stride = s->current_frame.linesize[0] / 2; - line_inc = stride - width; - index = y * stride + x; - current_x = x; - while(pixel_count--) { - - rgb16_plane[index++] = palette16[*pixel_buffer++]; - - ADVANCE_CURRENT_X(); - } - break; - - case PIX_FMT_RGB24: - case PIX_FMT_BGR24: - rgb_plane = s->current_frame.data[0]; - stride = s->current_frame.linesize[0]; - line_inc = stride - width * 3; - index = y * stride + x * 3; - current_x = x; - while(pixel_count--) { - pix = *pixel_buffer++; - - rgb_plane[index++] = s->palette[pix * 4 + 0]; - rgb_plane[index++] = s->palette[pix * 4 + 1]; - rgb_plane[index++] = s->palette[pix * 4 + 2]; - - ADVANCE_CURRENT_X(); - } - break; - - case PIX_FMT_RGBA32: - rgb32_plane = (unsigned int *)s->current_frame.data[0]; - palette32 = (unsigned int *)s->palette; - stride = s->current_frame.linesize[0] / 4; - line_inc = stride - width; - index = y * stride + x; - current_x = x; - while(pixel_count--) { - rgb32_plane[index++] = palette32[*pixel_buffer++]; - - ADVANCE_CURRENT_X(); - } - break; - - case PIX_FMT_YUV444P: - y_plane = s->current_frame.data[0]; - u_plane = s->current_frame.data[1]; - v_plane = s->current_frame.data[2]; - stride = s->current_frame.linesize[0]; - line_inc = stride - width; - index = y * stride + x; - current_x = x; - while(pixel_count--) { - pix = *pixel_buffer++; - - y_plane[index] = s->palette[pix * 4 + 0]; - u_plane[index] = s->palette[pix * 4 + 1]; - v_plane[index] = s->palette[pix * 4 + 2]; - - index++; - ADVANCE_CURRENT_X(); + palette_plane = s->current_frame.data[0]; + stride = s->current_frame.linesize[0]; + line_inc = stride - width; + index = y * stride + x; + current_x = x; + while((pixel_count--) && (index < s->frame_size)) { + + /* don't do a memcpy() here; keyframes generally copy an entire + * frame of data and the stride needs to be accounted for */ + palette_plane[index++] = *pixel_buffer++; + + current_x++; + if (current_x >= width) { + index += line_inc; + current_x = 0; } - break; - - default: - av_log(s->avctx, AV_LOG_ERROR, " Xan WC3: Unhandled colorspace\n"); - break; } } -#define ADVANCE_CURFRAME_X() \ - curframe_x++; \ - if (curframe_x >= width) { \ - curframe_index += line_inc; \ - curframe_x = 0; \ - } - -#define ADVANCE_PREVFRAME_X() \ - prevframe_x++; \ - if (prevframe_x >= width) { \ - prevframe_index += line_inc; \ - prevframe_x = 0; \ - } - -static void inline xan_wc3_copy_pixel_run(XanContext *s, +static void inline xan_wc3_copy_pixel_run(XanContext *s, int x, int y, int pixel_count, int motion_x, int motion_y) { int stride; @@ -485,123 +244,31 @@ static void inline xan_wc3_copy_pixel_run(XanContext *s, int curframe_x, prevframe_x; int width = s->avctx->width; unsigned char *palette_plane, *prev_palette_plane; - unsigned char *y_plane, *u_plane, *v_plane; - unsigned char *prev_y_plane, *prev_u_plane, *prev_v_plane; - unsigned char *rgb_plane, *prev_rgb_plane; - unsigned short *rgb16_plane, *prev_rgb16_plane; - unsigned int *rgb32_plane, *prev_rgb32_plane; - - switch (s->avctx->pix_fmt) { - - case PIX_FMT_PAL8: - palette_plane = s->current_frame.data[0]; - prev_palette_plane = s->last_frame.data[0]; - stride = s->current_frame.linesize[0]; - line_inc = stride - width; - curframe_index = y * stride + x; - curframe_x = x; - prevframe_index = (y + motion_y) * stride + x + motion_x; - prevframe_x = x + motion_x; - while(pixel_count--) { - - palette_plane[curframe_index++] = - prev_palette_plane[prevframe_index++]; - - ADVANCE_CURFRAME_X(); - ADVANCE_PREVFRAME_X(); - } - break; - - case PIX_FMT_RGB555: - case PIX_FMT_RGB565: - rgb16_plane = (unsigned short *)s->current_frame.data[0]; - prev_rgb16_plane = (unsigned short *)s->last_frame.data[0]; - stride = s->current_frame.linesize[0] / 2; - line_inc = stride - width; - curframe_index = y * stride + x; - curframe_x = x; - prevframe_index = (y + motion_y) * stride + x + motion_x; - prevframe_x = x + motion_x; - while(pixel_count--) { - - rgb16_plane[curframe_index++] = - prev_rgb16_plane[prevframe_index++]; - - ADVANCE_CURFRAME_X(); - ADVANCE_PREVFRAME_X(); - } - break; - - case PIX_FMT_RGB24: - case PIX_FMT_BGR24: - rgb_plane = s->current_frame.data[0]; - prev_rgb_plane = s->last_frame.data[0]; - stride = s->current_frame.linesize[0]; - line_inc = stride - width * 3; - curframe_index = y * stride + x * 3; - curframe_x = x; - prevframe_index = (y + motion_y) * stride + - (3 * (x + motion_x)); - prevframe_x = x + motion_x; - while(pixel_count--) { - - rgb_plane[curframe_index++] = prev_rgb_plane[prevframe_index++]; - rgb_plane[curframe_index++] = prev_rgb_plane[prevframe_index++]; - rgb_plane[curframe_index++] = prev_rgb_plane[prevframe_index++]; - - ADVANCE_CURFRAME_X(); - ADVANCE_PREVFRAME_X(); - } - break; - - case PIX_FMT_RGBA32: - rgb32_plane = (unsigned int *)s->current_frame.data[0]; - prev_rgb32_plane = (unsigned int *)s->last_frame.data[0]; - stride = s->current_frame.linesize[0] / 4; - line_inc = stride - width; - curframe_index = y * stride + x; - curframe_x = x; - prevframe_index = (y + motion_y) * stride + x + motion_x; - prevframe_x = x + motion_x; - while(pixel_count--) { - - rgb32_plane[curframe_index++] = - prev_rgb32_plane[prevframe_index++]; - - ADVANCE_CURFRAME_X(); - ADVANCE_PREVFRAME_X(); - } - break; - - case PIX_FMT_YUV444P: - y_plane = s->current_frame.data[0]; - u_plane = s->current_frame.data[1]; - v_plane = s->current_frame.data[2]; - prev_y_plane = s->last_frame.data[0]; - prev_u_plane = s->last_frame.data[1]; - prev_v_plane = s->last_frame.data[2]; - stride = s->current_frame.linesize[0]; - line_inc = stride - width; - curframe_index = y * stride + x; - curframe_x = x; - prevframe_index = (y + motion_y) * stride + x + motion_x; - prevframe_x = x + motion_x; - while(pixel_count--) { - - y_plane[curframe_index] = prev_y_plane[prevframe_index]; - u_plane[curframe_index] = prev_u_plane[prevframe_index]; - v_plane[curframe_index] = prev_v_plane[prevframe_index]; - - curframe_index++; - ADVANCE_CURFRAME_X(); - prevframe_index++; - ADVANCE_PREVFRAME_X(); + + palette_plane = s->current_frame.data[0]; + prev_palette_plane = s->last_frame.data[0]; + stride = s->current_frame.linesize[0]; + line_inc = stride - width; + curframe_index = y * stride + x; + curframe_x = x; + prevframe_index = (y + motion_y) * stride + x + motion_x; + prevframe_x = x + motion_x; + while((pixel_count--) && (curframe_index < s->frame_size)) { + + palette_plane[curframe_index++] = + prev_palette_plane[prevframe_index++]; + + curframe_x++; + if (curframe_x >= width) { + curframe_index += line_inc; + curframe_x = 0; } - break; - default: - av_log(s->avctx, AV_LOG_ERROR, " Xan WC3: Unhandled colorspace\n"); - break; + prevframe_x++; + if (prevframe_x >= width) { + prevframe_index += line_inc; + prevframe_x = 0; + } } } @@ -617,7 +284,9 @@ static void xan_wc3_decode_frame(XanContext *s) { int x, y; unsigned char *opcode_buffer = s->buffer1; + int opcode_buffer_size = s->buffer1_size; unsigned char *imagedata_buffer = s->buffer2; + int imagedata_buffer_size = s->buffer2_size; /* pointers to segments inside the compressed chunk */ unsigned char *huffman_segment; @@ -630,10 +299,11 @@ static void xan_wc3_decode_frame(XanContext *s) { vector_segment = s->buf + LE_16(&s->buf[4]); imagedata_segment = s->buf + LE_16(&s->buf[6]); - xan_huffman_decode(opcode_buffer, huffman_segment); + xan_huffman_decode(opcode_buffer, huffman_segment, opcode_buffer_size); if (imagedata_segment[0] == 2) - xan_unpack(imagedata_buffer, &imagedata_segment[1]); + xan_unpack(imagedata_buffer, &imagedata_segment[1], + imagedata_buffer_size); else imagedata_buffer = &imagedata_segment[1]; @@ -731,13 +401,6 @@ static void xan_wc3_decode_frame(XanContext *s) { } } } - - /* for PAL8, make the palette available on the way out */ - if (s->avctx->pix_fmt == PIX_FMT_PAL8) { - memcpy(s->current_frame.data[1], s->palette, PALETTE_COUNT * 4); - s->current_frame.palette_has_changed = 1; - s->avctx->palctrl->palette_changed = 0; - } } static void xan_wc4_decode_frame(XanContext *s) { @@ -749,16 +412,6 @@ static int xan_decode_frame(AVCodecContext *avctx, { XanContext *s = avctx->priv_data; AVPaletteControl *palette_control = avctx->palctrl; - int keyframe = 0; - - if (palette_control->palette_changed) { - /* load the new palette and reset the palette control */ - xan_wc3_build_palette(s, palette_control->palette); - /* If pal8 we clear flag when we copy palette */ - if (s->avctx->pix_fmt != PIX_FMT_PAL8) - palette_control->palette_changed = 0; - keyframe = 1; - } if (avctx->get_buffer(avctx, &s->current_frame)) { av_log(s->avctx, AV_LOG_ERROR, " Xan Video: get_buffer() failed\n"); @@ -766,6 +419,14 @@ static int xan_decode_frame(AVCodecContext *avctx, } s->current_frame.reference = 3; + if (!s->frame_size) + s->frame_size = s->current_frame.linesize[0] * s->avctx->height; + + palette_control->palette_changed = 0; + memcpy(s->current_frame.data[1], palette_control->palette, + AVPALETTE_SIZE); + s->current_frame.palette_has_changed = 1; + s->buf = buf; s->size = buf_size; @@ -793,7 +454,8 @@ static int xan_decode_end(AVCodecContext *avctx) XanContext *s = avctx->priv_data; /* release the last frame */ - avctx->release_buffer(avctx, &s->last_frame); + if (s->last_frame.data[0]) + avctx->release_buffer(avctx, &s->last_frame); av_free(s->buffer1); av_free(s->buffer2);