* aka Microsoft Expression Encoder Screen) decoder
*/
+#include "libavutil/thread.h"
+
#include "avcodec.h"
#include "bytestream.h"
#include "get_bits.h"
#include "internal.h"
+#include "jpegtables.h"
#include "mss34dsp.h"
#include "unary.h"
{ 0, 3, 1, 1, 1, 1, 1, 1, 1, 2, 0, 0, 0, 0, 0, 0 }
};
-static const uint8_t mss4_ac_vlc_lens[2][16] = {
- { 0, 2, 1, 3, 3, 2, 4, 3, 5, 5, 4, 4, 0, 0, 1, 125 },
- { 0, 2, 1, 2, 4, 4, 3, 4, 7, 5, 4, 4, 0, 1, 2, 119 }
-};
-
-static const uint8_t mss4_ac_vlc_syms[2][162] = {
- { 0x01, 0x02, 0x03, 0x00, 0x04, 0x11, 0x05, 0x12,
- 0x21, 0x31, 0x41, 0x06, 0x13, 0x51, 0x61, 0x07,
- 0x22, 0x71, 0x14, 0x32, 0x81, 0x91, 0xA1, 0x08,
- 0x23, 0x42, 0xB1, 0xC1, 0x15, 0x52, 0xD1, 0xF0,
- 0x24, 0x33, 0x62, 0x72, 0x82, 0x09, 0x0A, 0x16,
- 0x17, 0x18, 0x19, 0x1A, 0x25, 0x26, 0x27, 0x28,
- 0x29, 0x2A, 0x34, 0x35, 0x36, 0x37, 0x38, 0x39,
- 0x3A, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48, 0x49,
- 0x4A, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58, 0x59,
- 0x5A, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68, 0x69,
- 0x6A, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78, 0x79,
- 0x7A, 0x83, 0x84, 0x85, 0x86, 0x87, 0x88, 0x89,
- 0x8A, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97, 0x98,
- 0x99, 0x9A, 0xA2, 0xA3, 0xA4, 0xA5, 0xA6, 0xA7,
- 0xA8, 0xA9, 0xAA, 0xB2, 0xB3, 0xB4, 0xB5, 0xB6,
- 0xB7, 0xB8, 0xB9, 0xBA, 0xC2, 0xC3, 0xC4, 0xC5,
- 0xC6, 0xC7, 0xC8, 0xC9, 0xCA, 0xD2, 0xD3, 0xD4,
- 0xD5, 0xD6, 0xD7, 0xD8, 0xD9, 0xDA, 0xE1, 0xE2,
- 0xE3, 0xE4, 0xE5, 0xE6, 0xE7, 0xE8, 0xE9, 0xEA,
- 0xF1, 0xF2, 0xF3, 0xF4, 0xF5, 0xF6, 0xF7, 0xF8,
- 0xF9, 0xFA },
- { 0x00, 0x01, 0x02, 0x03, 0x11, 0x04, 0x05, 0x21,
- 0x31, 0x06, 0x12, 0x41, 0x51, 0x07, 0x61, 0x71,
- 0x13, 0x22, 0x32, 0x81, 0x08, 0x14, 0x42, 0x91,
- 0xA1, 0xB1, 0xC1, 0x09, 0x23, 0x33, 0x52, 0xF0,
- 0x15, 0x62, 0x72, 0xD1, 0x0A, 0x16, 0x24, 0x34,
- 0xE1, 0x25, 0xF1, 0x17, 0x18, 0x19, 0x1A, 0x26,
- 0x27, 0x28, 0x29, 0x2A, 0x35, 0x36, 0x37, 0x38,
- 0x39, 0x3A, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48,
- 0x49, 0x4A, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58,
- 0x59, 0x5A, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68,
- 0x69, 0x6A, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78,
- 0x79, 0x7A, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87,
- 0x88, 0x89, 0x8A, 0x92, 0x93, 0x94, 0x95, 0x96,
- 0x97, 0x98, 0x99, 0x9A, 0xA2, 0xA3, 0xA4, 0xA5,
- 0xA6, 0xA7, 0xA8, 0xA9, 0xAA, 0xB2, 0xB3, 0xB4,
- 0xB5, 0xB6, 0xB7, 0xB8, 0xB9, 0xBA, 0xC2, 0xC3,
- 0xC4, 0xC5, 0xC6, 0xC7, 0xC8, 0xC9, 0xCA, 0xD2,
- 0xD3, 0xD4, 0xD5, 0xD6, 0xD7, 0xD8, 0xD9, 0xDA,
- 0xE2, 0xE3, 0xE4, 0xE5, 0xE6, 0xE7, 0xE8, 0xE9,
- 0xEA, 0xF2, 0xF3, 0xF4, 0xF5, 0xF6, 0xF7, 0xF8,
- 0xF9, 0xFA }
-};
-
static const uint8_t vec_len_syms[2][4] = {
{ 4, 2, 3, 1 },
{ 4, 1, 2, 3 }
typedef struct MSS4Context {
AVFrame *pic;
- VLC dc_vlc[2], ac_vlc[2];
- VLC vec_entry_vlc[2];
int block[64];
uint8_t imgbuf[3][16 * 16];
int prev_vec[3][4];
} MSS4Context;
-static av_cold int mss4_init_vlc(VLC *vlc, const uint8_t *lens,
- const uint8_t *syms, int num_syms)
+static VLC dc_vlc[2], ac_vlc[2];
+static VLC vec_entry_vlc[2];
+
+static av_cold void mss4_init_vlc(VLC *vlc, unsigned *offset,
+ const uint8_t *lens, const uint8_t *syms)
{
+ static VLC_TYPE vlc_buf[2146][2];
uint8_t bits[MAX_ENTRIES];
- uint16_t codes[MAX_ENTRIES];
int i, j;
- int prefix = 0, max_bits = 0, idx = 0;
+ int idx = 0;
for (i = 0; i < 16; i++) {
for (j = 0; j < lens[i]; j++) {
bits[idx] = i + 1;
- codes[idx] = prefix++;
- max_bits = i + 1;
idx++;
}
- prefix <<= 1;
}
- return ff_init_vlc_sparse(vlc, FFMIN(max_bits, 9), num_syms, bits, 1, 1,
- codes, 2, 2, syms, 1, 1, 0);
+ vlc->table = &vlc_buf[*offset];
+ vlc->table_allocated = FF_ARRAY_ELEMS(vlc_buf) - *offset;
+ ff_init_vlc_from_lengths(vlc, FFMIN(bits[idx - 1], 9), idx,
+ bits, 1, syms, 1, 1,
+ 0, INIT_VLC_STATIC_OVERLONG, NULL);
+ *offset += vlc->table_size;
}
-static av_cold int mss4_init_vlcs(MSS4Context *ctx)
+static av_cold void mss4_init_vlcs(void)
{
- int ret, i;
-
- for (i = 0; i < 2; i++) {
- ret = mss4_init_vlc(&ctx->dc_vlc[i], mss4_dc_vlc_lens[i], NULL, 12);
- if (ret)
- return ret;
- ret = mss4_init_vlc(&ctx->ac_vlc[i], mss4_ac_vlc_lens[i],
- mss4_ac_vlc_syms[i], 162);
- if (ret)
- return ret;
- ret = mss4_init_vlc(&ctx->vec_entry_vlc[i], mss4_vec_entry_vlc_lens[i],
- mss4_vec_entry_vlc_syms[i], 9);
- if (ret)
- return ret;
- }
- return 0;
-}
-
-static av_cold void mss4_free_vlcs(MSS4Context *ctx)
-{
- int i;
-
- for (i = 0; i < 2; i++) {
- ff_free_vlc(&ctx->dc_vlc[i]);
- ff_free_vlc(&ctx->ac_vlc[i]);
- ff_free_vlc(&ctx->vec_entry_vlc[i]);
+ for (unsigned i = 0, offset = 0; i < 2; i++) {
+ mss4_init_vlc(&dc_vlc[i], &offset, mss4_dc_vlc_lens[i], NULL);
+ mss4_init_vlc(&ac_vlc[i], &offset,
+ i ? avpriv_mjpeg_bits_ac_chrominance + 1
+ : avpriv_mjpeg_bits_ac_luminance + 1,
+ i ? avpriv_mjpeg_val_ac_chrominance
+ : avpriv_mjpeg_val_ac_luminance);
+ mss4_init_vlc(&vec_entry_vlc[i], &offset, mss4_vec_entry_vlc_lens[i],
+ mss4_vec_entry_vlc_syms[i]);
}
}
int xpos = mb_x * 2 + i;
c->dc_cache[j][TOP_LEFT] = c->dc_cache[j][TOP];
c->dc_cache[j][TOP] = c->prev_dc[0][mb_x * 2 + i];
- ret = mss4_decode_dct(gb, c->dc_vlc, c->ac_vlc, c->block,
+ ret = mss4_decode_dct(gb, &dc_vlc[0], &ac_vlc[0], c->block,
c->dc_cache[j],
xpos, mb_y * 2 + j, c->quant_mat[0]);
if (ret)
for (i = 1; i < 3; i++) {
c->dc_cache[i + 1][TOP_LEFT] = c->dc_cache[i + 1][TOP];
c->dc_cache[i + 1][TOP] = c->prev_dc[i][mb_x];
- ret = mss4_decode_dct(gb, c->dc_vlc + 1, c->ac_vlc + 1,
+ ret = mss4_decode_dct(gb, &dc_vlc[1], &ac_vlc[1],
c->block, c->dc_cache[i + 1], mb_x, mb_y,
c->quant_mat[1]);
if (ret)
for (i = 0; i < 3; i++) {
vec_len[i] = vec_len_syms[!!i][get_unary(gb, 0, 3)];
for (j = 0; j < vec_len[i]; j++) {
- vec[i][j] = get_coeff(gb, &ctx->vec_entry_vlc[!!i]);
+ vec[i][j] = get_coeff(gb, &vec_entry_vlc[!!i]);
vec[i][j] += ctx->prev_vec[i][j];
ctx->prev_vec[i][j] = vec[i][j];
}
"Empty frame found but it is not a skip frame.\n");
return AVERROR_INVALIDDATA;
}
+ mb_width = FFALIGN(width, 16) >> 4;
+ mb_height = FFALIGN(height, 16) >> 4;
+
+ if (frame_type != SKIP_FRAME && 8*buf_size < 8*HEADER_SIZE + mb_width*mb_height)
+ return AVERROR_INVALIDDATA;
- if ((ret = ff_reget_buffer(avctx, c->pic)) < 0)
+ if ((ret = ff_reget_buffer(avctx, c->pic, 0)) < 0)
return ret;
c->pic->key_frame = (frame_type == INTRA_FRAME);
c->pic->pict_type = (frame_type == INTRA_FRAME) ? AV_PICTURE_TYPE_I
if ((ret = init_get_bits8(&gb, buf + HEADER_SIZE, buf_size - HEADER_SIZE)) < 0)
return ret;
-
- mb_width = FFALIGN(width, 16) >> 4;
- mb_height = FFALIGN(height, 16) >> 4;
dst[0] = c->pic->data[0];
dst[1] = c->pic->data[1];
dst[2] = c->pic->data[2];
av_frame_free(&c->pic);
for (i = 0; i < 3; i++)
av_freep(&c->prev_dc[i]);
- mss4_free_vlcs(c);
return 0;
}
static av_cold int mss4_decode_init(AVCodecContext *avctx)
{
+ static AVOnce init_static_once = AV_ONCE_INIT;
MSS4Context * const c = avctx->priv_data;
int i;
- if (mss4_init_vlcs(c)) {
- av_log(avctx, AV_LOG_ERROR, "Cannot initialise VLCs\n");
- mss4_free_vlcs(c);
- return AVERROR(ENOMEM);
- }
for (i = 0; i < 3; i++) {
c->dc_stride[i] = FFALIGN(avctx->width, 16) >> (2 + !!i);
c->prev_dc[i] = av_malloc_array(c->dc_stride[i], sizeof(**c->prev_dc));
if (!c->prev_dc[i]) {
av_log(avctx, AV_LOG_ERROR, "Cannot allocate buffer\n");
- mss4_free_vlcs(c);
return AVERROR(ENOMEM);
}
}
c->pic = av_frame_alloc();
- if (!c->pic) {
- mss4_decode_end(avctx);
+ if (!c->pic)
return AVERROR(ENOMEM);
- }
avctx->pix_fmt = AV_PIX_FMT_YUV444P;
+ ff_thread_once(&init_static_once, mss4_init_vlcs);
+
return 0;
}
-AVCodec ff_mts2_decoder = {
+const AVCodec ff_mts2_decoder = {
.name = "mts2",
.long_name = NULL_IF_CONFIG_SMALL("MS Expression Encoder Screen"),
.type = AVMEDIA_TYPE_VIDEO,
.close = mss4_decode_end,
.decode = mss4_decode_frame,
.capabilities = AV_CODEC_CAP_DR1,
+ .caps_internal = FF_CODEC_CAP_INIT_CLEANUP | FF_CODEC_CAP_INIT_THREADSAFE,
};
projects / ffmpeg / blobdiff