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added solid color vectors; basic PAL8, 4x2-vector video (as in
Command & Conquer) looks great now; also added compressed codebook support, but files using these (Lands of Lore) are not correct yet Originally committed as revision 2344 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Mike Melanson
parent
20f269dc28
commit
cafa66af8e
@ -24,7 +24,8 @@
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* For more information about the RPZA format, visit:
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* http://www.pcisys.net/~melanson/codecs/
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*
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* The VQA video decoder outputs PAL8 colorspace data.
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* The VQA video decoder outputs PAL8 or RGB555 colorspace data, depending
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* on the type of data in the file.
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*
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* This decoder needs the 42-byte VQHD header from the beginning
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* of the VQA file passed through the extradata field. The VQHD header
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@ -32,12 +33,12 @@
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*
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* bytes 0-3 chunk fourcc: 'VQHD'
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* bytes 4-7 chunk size in big-endian format, should be 0x0000002A
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* bytes 8-50 VQHD chunk data
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* bytes 8-49 VQHD chunk data
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*
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* Bytes 8-50 are what this decoder expects to see.
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* Bytes 8-49 are what this decoder expects to see.
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*
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* Briefly, VQA is a vector quantized animation format that operates in a
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* 6-bit VGA palettized colorspace. It operates on pixel vectors (blocks)
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* VGA palettized colorspace. It operates on pixel vectors (blocks)
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* of either 4x2 or 4x4 in size. Compressed VQA chunks can contain vector
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* codebooks, palette information, and code maps for rendering vectors onto
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* frames. Any of these components can also be compressed with a run-length
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@ -55,7 +56,7 @@
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* V1,2 VQA uses 12-bit codebook indices. If the 12-bit indices were
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* packed into bytes and then RLE compressed, bytewise, the results would
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* be poor. That is why the coding method divides each index into 2 parts,
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* the top 4 bits and the bottom 8 bits, the RL encodes the 4-bit pieces
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* the top 4 bits and the bottom 8 bits, then RL encodes the 4-bit pieces
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* together and the 8-bit pieces together. If most of the vectors are
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* clustered into one group of 256 vectors, most of the 4-bit index pieces
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* should be the same.
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@ -74,12 +75,12 @@
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#define VQA_HEADER_SIZE 0x2A
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#define CHUNK_PREAMBLE_SIZE 8
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/* v1, v2 files: each vector codebook entry is 4x2=8 pixels = 8 bytes */
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#define V1_2_VECTOR_SIZE 8
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#define V1_2_MAX_VECTORS 0xF00
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/* v3 files: each vector codebook entry is 4x4=16 pixels = 16 bytes */
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#define V3_VECTOR_SIZE 16
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#define V3_MAX_VECTORS 0xFF00
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/* allocate the maximum vector space, regardless of the file version:
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* (0xFF00 codebook vectors + 0x100 solid pixel vectors) * (4x4 pixels/block) */
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#define MAX_CODEBOOK_VECTORS 0xFF00
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#define SOLID_PIXEL_VECTORS 0x100
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#define MAX_VECTORS (MAX_CODEBOOK_VECTORS + SOLID_PIXEL_VECTORS)
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#define MAX_CODEBOOK_SIZE (MAX_VECTORS * 4 * 4)
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#define LE_16(x) ((((uint8_t*)(x))[1] << 8) | ((uint8_t*)(x))[0])
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#define BE_16(x) ((((uint8_t*)(x))[0] << 8) | ((uint8_t*)(x))[1])
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@ -128,6 +129,7 @@ typedef struct VqaContext {
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int vqa_version; /* this should be either 1, 2 or 3 */
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unsigned char *codebook; /* the current codebook */
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int codebook_size;
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unsigned char *next_codebook_buffer; /* accumulator for next codebook */
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int next_codebook_buffer_index;
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@ -144,6 +146,7 @@ static int vqa_decode_init(AVCodecContext *avctx)
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{
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VqaContext *s = (VqaContext *)avctx->priv_data;
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unsigned char *vqa_header;
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int i, j, codebook_index;;
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s->avctx = avctx;
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avctx->pix_fmt = PIX_FMT_PAL8;
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@ -173,12 +176,21 @@ static int vqa_decode_init(AVCodecContext *avctx)
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}
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/* allocate codebooks */
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if (s->vqa_version == 3) {
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s->codebook = av_malloc(V3_VECTOR_SIZE * V3_MAX_VECTORS);
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s->next_codebook_buffer = av_malloc(V3_VECTOR_SIZE * V3_MAX_VECTORS);
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s->codebook_size = MAX_CODEBOOK_SIZE;
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s->codebook = av_malloc(s->codebook_size);
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s->next_codebook_buffer = av_malloc(s->codebook_size);
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/* initialize the solid-color vectors */
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if (s->vector_height == 4) {
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codebook_index = 0xFF00 * 16;
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for (i = 0; i < 256; i++)
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for (j = 0; j < 16; j++)
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s->codebook[codebook_index++] = i;
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} else {
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s->codebook = av_malloc(V1_2_VECTOR_SIZE * V1_2_MAX_VECTORS);
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s->next_codebook_buffer = av_malloc(V1_2_VECTOR_SIZE * V1_2_MAX_VECTORS);
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codebook_index = 0xF00 * 8;
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for (i = 0; i < 256; i++)
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for (j = 0; j < 8; j++)
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s->codebook[codebook_index++] = i;
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}
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s->next_codebook_buffer_index = 0;
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@ -194,14 +206,14 @@ static int vqa_decode_init(AVCodecContext *avctx)
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#define CHECK_COUNT() \
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if (dest_index + count > dest_size) { \
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printf ("vqavideo: decode_format80 problem: next op would overflow dest_index\n"); \
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printf ("vqavideo: current dest_index = %d, count = %d, dest_size = %d\n", \
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printf (" VQA video: decode_format80 problem: next op would overflow dest_index\n"); \
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printf (" VQA video: current dest_index = %d, count = %d, dest_size = %d\n", \
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dest_index, count, dest_size); \
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return; \
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}
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static void decode_format80(unsigned char *src, int src_size,
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unsigned char *dest, int dest_size) {
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unsigned char *dest, int dest_size, int check_size) {
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int src_index = 0;
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int dest_index = 0;
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@ -219,7 +231,7 @@ static void decode_format80(unsigned char *src, int src_size,
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return;
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if (dest_index >= dest_size) {
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printf ("vqavideo: decode_format80 problem: dest_index (%d) exceeded dest_size (%d)\n",
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printf (" VQA video: decode_format80 problem: dest_index (%d) exceeded dest_size (%d)\n",
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dest_index, dest_size);
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return;
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}
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@ -281,15 +293,18 @@ static void decode_format80(unsigned char *src, int src_size,
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}
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}
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/* validate that the entire destination buffer was filled; this is
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* important for decoding frame maps since each vector needs to have a
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* codebook entry; it is not important for compressed codebooks because
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* not every entry needs to be filled */
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if (check_size)
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if (dest_index < dest_size)
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printf ("vqavideo: decode_format80 problem: decode finished with dest_index (%d) < dest_size (%d)\n",
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printf (" VQA video: decode_format80 problem: decode finished with dest_index (%d) < dest_size (%d)\n",
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dest_index, dest_size);
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}
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static void vqa_decode_chunk(VqaContext *s)
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{
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//static int frame = 0;
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unsigned int chunk_type;
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unsigned int chunk_size;
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int byte_skip;
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@ -315,7 +330,6 @@ static void vqa_decode_chunk(VqaContext *s)
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int lobytes = 0;
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int hibytes = s->decode_buffer_size / 2;
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//printf (" **** decoding frame #%d, stride = %d\n", frame++, s->frame.linesize[0]);
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/* first, traverse through the frame and find the subchunks */
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while (index < s->size) {
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@ -387,7 +401,7 @@ static void vqa_decode_chunk(VqaContext *s)
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chunk_size = BE_32(&s->buf[cpl0_chunk + 4]);
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/* sanity check the palette size */
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if (chunk_size / 3 > 256) {
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printf ("vqavideo: problem: found a palette chunk with %d colors\n",
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printf (" VQA video: problem: found a palette chunk with %d colors\n",
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chunk_size / 3);
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return;
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}
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@ -410,35 +424,25 @@ static void vqa_decode_chunk(VqaContext *s)
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return;
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}
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/* decompress the full codebook chunk into the codebook accumulation
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* buffer; this is safe since only the first frame is supposed to have
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* a full codebook */
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/* decompress the full codebook chunk */
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if (cbfz_chunk != -1) {
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/* yet to be handled */
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chunk_size = BE_32(&s->buf[cbfz_chunk + 4]);
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cbfz_chunk += CHUNK_PREAMBLE_SIZE;
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decode_format80(&s->buf[cbfz_chunk], chunk_size,
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s->codebook, s->codebook_size, 0);
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}
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/* copy a full codebook */
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if (cbf0_chunk != -1) {
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index = cbf0_chunk;
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chunk_size = BE_32(&s->buf[cbf0_chunk + 4]);
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/* sanity check the full codebook size */
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if (s->vqa_version == 3) {
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if (chunk_size / (V3_VECTOR_SIZE) > V3_MAX_VECTORS) {
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if (chunk_size > MAX_CODEBOOK_SIZE) {
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printf (" VQA video: problem: CBF0 chunk too large (0x%X bytes)\n",
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chunk_size);
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return;
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}
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} else {
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if (chunk_size / (V1_2_VECTOR_SIZE) > V1_2_MAX_VECTORS) {
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printf (" VQA video: problem: CBF0 chunk too large (0x%X bytes)\n",
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chunk_size);
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return;
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}
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}
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cbf0_chunk += CHUNK_PREAMBLE_SIZE;
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memcpy(s->codebook, &s->buf[cbf0_chunk], chunk_size);
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@ -452,23 +456,10 @@ static void vqa_decode_chunk(VqaContext *s)
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return;
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}
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/* decode frame */
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chunk_size = BE_32(&s->buf[vptz_chunk + 4]);
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vptz_chunk += CHUNK_PREAMBLE_SIZE;
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decode_format80(&s->buf[vptz_chunk], chunk_size,
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s->decode_buffer, s->decode_buffer_size);
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if (0)
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{
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int count = 0;
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printf (" finished decoding frame...");
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for (index = 8000; index < 16000; index++)
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if (s->decode_buffer[index] > 0x0F)
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count++;
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printf (" %d/8000 hibytes exceeded 0x0F\n", count);
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}
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s->decode_buffer, s->decode_buffer_size, 1);
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/* render the final PAL8 frame */
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for (y = 0; y < s->frame.linesize[0] * s->height;
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@ -490,15 +481,9 @@ printf (" %d/8000 hibytes exceeded 0x0F\n", count);
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case 2:
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lobyte = s->decode_buffer[lobytes];
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hibyte = s->decode_buffer[hibytes];
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if (hibyte > 0x0F) {
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printf (" VQA video: problem: vector #%d/%d high byte out of range (0x%X >= 0x0F)\n",
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lobytes, s->decode_buffer_size / 2, hibyte);
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hibyte = lobyte = 0;
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} else if (hibyte == 0x0F)
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hibyte = 0;
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vector_index = (hibyte << 8) | lobyte;
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vector_index *= V1_2_VECTOR_SIZE;
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lines = 2;
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vector_index *= 8;
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lines = s->vector_height;
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break;
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case 3:
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@ -549,8 +534,26 @@ printf (" %d/8000 hibytes exceeded 0x0F\n", count);
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if (cbpz_chunk != -1) {
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/* more partial codebook handling ... */
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chunk_size = BE_32(&s->buf[cbpz_chunk + 4]);
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cbpz_chunk += CHUNK_PREAMBLE_SIZE;
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/* accumulate partial codebook */
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memcpy(&s->next_codebook_buffer[s->next_codebook_buffer_index],
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&s->buf[cbpz_chunk], chunk_size);
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s->next_codebook_buffer_index += chunk_size;
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s->partial_countdown--;
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if (s->partial_countdown == 0) {
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/* decompress codebook */
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decode_format80(s->next_codebook_buffer,
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s->next_codebook_buffer_index,
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s->codebook, s->codebook_size, 0);
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/* reset accounting */
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s->next_codebook_buffer_index = 0;
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s->partial_countdown = s->partial_count;
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}
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}
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}
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