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https://gitee.com/openharmony/third_party_ffmpeg
synced 2024-11-24 03:39:45 +00:00
simplified parsing - added MMX idct support
Originally committed as revision 1000 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Fabrice Bellard
parent
020fcc94e0
commit
7be166e4ea
187
libavcodec/dv.c
187
libavcodec/dv.c
@ -36,8 +36,9 @@ typedef struct DVVideoDecodeContext {
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int linesize[3];
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DCTELEM block[5*6][64] __align8;
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UINT8 dv_zigzag[2][64];
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UINT8 idct_permutation[64];
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/* XXX: move it to static storage ? */
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UINT8 dv_shift[2][2][22][64];
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UINT8 dv_shift[2][22][64];
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void (*idct_put[2])(UINT8 *dest, int line_size, DCTELEM *block);
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} DVVideoDecodeContext;
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@ -49,24 +50,23 @@ static RL_VLC_ELEM *dv_rl_vlc[1];
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static void dv_build_unquantize_tables(DVVideoDecodeContext *s)
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{
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int i, e, q;
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int i, q, j;
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/* NOTE: max left shift is 6 */
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for(e = 0; e < 2; e++) {
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for(q = 0; q < 22; q++) {
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/* 88 unquant */
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for(i = 1; i < 64; i++) {
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/* 88 table */
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s->dv_shift[0][e][q][i] =
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dv_quant_shifts[q][dv_88_areas[i]] + e + 1;
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}
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/* 248 unquant */
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for(i = 1; i < 64; i++) {
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/* 248 table */
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s->dv_shift[1][e][q][i] =
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dv_quant_shifts[q][dv_248_areas[i]] + e + 1;
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}
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for(q = 0; q < 22; q++) {
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/* 88 unquant */
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for(i = 1; i < 64; i++) {
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/* 88 table */
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j = s->idct_permutation[i];
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s->dv_shift[0][q][j] =
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dv_quant_shifts[q][dv_88_areas[i]] + 1;
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}
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/* 248 unquant */
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for(i = 1; i < 64; i++) {
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/* 248 table */
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s->dv_shift[1][q][i] =
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dv_quant_shifts[q][dv_248_areas[i]] + 1;
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}
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}
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}
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@ -74,6 +74,7 @@ static void dv_build_unquantize_tables(DVVideoDecodeContext *s)
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static int dvvideo_decode_init(AVCodecContext *avctx)
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{
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DVVideoDecodeContext *s = avctx->priv_data;
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MpegEncContext s2;
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static int done;
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if (!done) {
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@ -108,32 +109,46 @@ static int dvvideo_decode_init(AVCodecContext *avctx)
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dv_rl_vlc[0][i].run = run;
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}
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}
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/* ugly way to get the idct & scantable */
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/* XXX: fix it */
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memset(&s2, 0, sizeof(MpegEncContext));
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s2.flags = avctx->flags;
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s2.avctx = avctx;
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// s2->out_format = FMT_MJPEG;
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s2.width = 8;
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s2.height = 8;
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if (MPV_common_init(&s2) < 0)
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return -1;
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s->idct_put[0] = s2.idct_put;
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memcpy(s->idct_permutation, s2.idct_permutation, 64);
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memcpy(s->dv_zigzag[0], s2.intra_scantable.permutated, 64);
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/* XXX: use MMX also for idct248 */
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s->idct_put[1] = simple_idct248_put;
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memcpy(s->dv_zigzag[1], dv_248_zigzag, 64);
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MPV_common_end(&s2);
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/* XXX: do it only for constant case */
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dv_build_unquantize_tables(s);
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{
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/* XXX: fix that : use mmx when possible */
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s->idct_put[0] = simple_idct_put;
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s->idct_put[1] = simple_idct248_put;
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memcpy(s->dv_zigzag[0], ff_zigzag_direct, 64);
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memcpy(s->dv_zigzag[1], dv_248_zigzag, 64);
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}
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return 0;
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}
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//#define VLC_DEBUG
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typedef struct MBInfo {
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const UINT8 *shift_table[6];
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const UINT8 *scan_table[6];
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UINT8 pos[6]; /* position in block */
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UINT8 eob_reached[6]; /* true if EOB has been reached */
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UINT8 dct_mode[6];
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UINT8 partial_bit_count[6];
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UINT16 partial_bit_buffer[6];
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UINT8 bit_buffer[80 + 4]; /* allow some slack */
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int bits_left;
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} MBInfo;
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typedef struct BlockInfo {
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const UINT8 *shift_table;
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const UINT8 *scan_table;
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UINT8 pos; /* position in block */
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UINT8 eob_reached; /* true if EOB has been reached */
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UINT8 dct_mode;
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UINT8 partial_bit_count;
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UINT16 partial_bit_buffer;
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int shift_offset;
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} BlockInfo;
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/* block size in bits */
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const static UINT16 block_sizes[6] = {
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@ -146,23 +161,24 @@ const static UINT16 block_sizes[6] = {
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/* decode ac coefs */
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static void dv_decode_ac(DVVideoDecodeContext *s,
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MBInfo *mb, INT16 *block, int j, int last_index)
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BlockInfo *mb, INT16 *block, int last_index)
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{
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int last_re_index;
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const UINT8 *scan_table = mb->scan_table[j];
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const UINT8 *shift_table = mb->shift_table[j];
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int pos = mb->pos[j];
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int shift_offset = mb->shift_offset;
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const UINT8 *scan_table = mb->scan_table;
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const UINT8 *shift_table = mb->shift_table;
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int pos = mb->pos;
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int level, pos1, sign, run;
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int partial_bit_count;
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OPEN_READER(re, &s->gb);
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#ifdef VLC_DEBUG
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printf("start %d\n", j);
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printf("start\n");
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#endif
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/* if we must parse a partial vlc, we do it here */
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partial_bit_count = mb->partial_bit_count[j];
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partial_bit_count = mb->partial_bit_count;
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if (partial_bit_count > 0) {
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UINT8 buf[4];
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UINT32 v;
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@ -175,12 +191,12 @@ static void dv_decode_ac(DVVideoDecodeContext *s,
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#ifdef VLC_DEBUG
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printf("show=%04x\n", SHOW_UBITS(re, &s->gb, 16));
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#endif
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v = (mb->partial_bit_buffer[j] << l) | SHOW_UBITS(re, &s->gb, l);
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v = (mb->partial_bit_buffer << l) | SHOW_UBITS(re, &s->gb, l);
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buf[0] = v >> 8;
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buf[1] = v;
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#ifdef VLC_DEBUG
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printf("v=%04x cnt=%d %04x\n",
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v, partial_bit_count, (mb->partial_bit_buffer[j] << l));
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v, partial_bit_count, (mb->partial_bit_buffer << l));
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#endif
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/* try to read the codeword */
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init_get_bits(&gb1, buf, 4);
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@ -204,9 +220,9 @@ static void dv_decode_ac(DVVideoDecodeContext *s,
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/* skip read bits */
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last_re_index = 0; /* avoid warning */
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re_index += l;
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/* by redefinition, if we can read the vlc, all partial bits
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/* by definition, if we can read the vlc, all partial bits
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will be read (otherwise we could have read the vlc before) */
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mb->partial_bit_count[j] = 0;
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mb->partial_bit_count = 0;
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UPDATE_CACHE(re, &s->gb);
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goto handle_vlc;
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}
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@ -230,11 +246,11 @@ static void dv_decode_ac(DVVideoDecodeContext *s,
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cannot_read:
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/* put position before read code */
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re_index = last_re_index;
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mb->eob_reached[j] = 0;
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mb->eob_reached = 0;
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break;
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}
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/* EOB */
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mb->eob_reached[j] = 1;
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mb->eob_reached = 1;
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break;
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} else if (level != 0) {
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if ((re_index + 1) > last_index)
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@ -248,7 +264,7 @@ static void dv_decode_ac(DVVideoDecodeContext *s,
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goto read_error;
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}
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pos1 = scan_table[pos];
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level = level << shift_table[pos1];
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level = level << (shift_table[pos1] + shift_offset);
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block[pos1] = level;
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// printf("run=%d level=%d shift=%d\n", run, level, shift_table[pos1]);
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} else {
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@ -264,13 +280,13 @@ static void dv_decode_ac(DVVideoDecodeContext *s,
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printf("error pos=%d\n", pos);
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#endif
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/* for errors, we consider the eob is reached */
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mb->eob_reached[j] = 1;
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mb->eob_reached = 1;
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break;
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}
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}
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}
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CLOSE_READER(re, &s->gb);
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mb->pos[j] = pos;
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mb->pos = pos;
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}
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static inline void bit_copy(PutBitContext *pb, GetBitContext *gb, int bits_left)
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@ -294,11 +310,13 @@ static inline void dv_decode_video_segment(DVVideoDecodeContext *s,
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DCTELEM *block, *block1;
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int c_offset, bits_left;
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UINT8 *y_ptr;
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MBInfo mb_data[5], *mb;
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BlockInfo mb_data[5 * 6], *mb, *mb1;
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void (*idct_put)(UINT8 *dest, int line_size, DCTELEM *block);
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UINT8 *buf_ptr;
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PutBitContext pb, vs_pb;
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UINT8 vs_bit_buffer[5 * 80 + 4];
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UINT8 mb_bit_buffer[80 + 4]; /* allow some slack */
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int mb_bit_count;
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UINT8 vs_bit_buffer[5 * 80 + 4]; /* allow some slack */
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int vs_bit_count;
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memset(s->block, 0, sizeof(s->block));
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@ -306,15 +324,16 @@ static inline void dv_decode_video_segment(DVVideoDecodeContext *s,
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/* pass 1 : read DC and AC coefficients in blocks */
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buf_ptr = buf_ptr1;
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block1 = &s->block[0][0];
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mb = mb_data;
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mb1 = mb_data;
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init_put_bits(&vs_pb, vs_bit_buffer, 5 * 80, NULL, NULL);
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vs_bit_count = 0;
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for(mb_index = 0; mb_index < 5; mb_index++) {
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/* skip header */
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quant = buf_ptr[3] & 0x0f;
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buf_ptr += 4;
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init_put_bits(&pb, mb->bit_buffer, 80, NULL, NULL);
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mb->bits_left = 0;
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init_put_bits(&pb, mb_bit_buffer, 80, NULL, NULL);
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mb_bit_count = 0;
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mb = mb1;
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block = block1;
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for(j = 0;j < 6; j++) {
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/* NOTE: size is not important here */
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@ -324,10 +343,11 @@ static inline void dv_decode_video_segment(DVVideoDecodeContext *s,
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dc = get_bits(&s->gb, 9);
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dc = (dc << (32 - 9)) >> (32 - 9);
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dct_mode = get_bits1(&s->gb);
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mb->dct_mode[j] = dct_mode;
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mb->scan_table[j] = s->dv_zigzag[dct_mode];
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mb->dct_mode = dct_mode;
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mb->scan_table = s->dv_zigzag[dct_mode];
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class1 = get_bits(&s->gb, 2);
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mb->shift_table[j] = s->dv_shift[dct_mode][class1 == 3]
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mb->shift_offset = (class1 == 3);
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mb->shift_table = s->dv_shift[dct_mode]
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[quant + dv_quant_offset[class1]];
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dc = dc << 2;
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/* convert to unsigned because 128 is not added in the
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@ -336,61 +356,64 @@ static inline void dv_decode_video_segment(DVVideoDecodeContext *s,
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block[0] = dc;
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last_index = block_sizes[j];
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buf_ptr += last_index >> 3;
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mb->pos[j] = 0;
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mb->partial_bit_count[j] = 0;
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mb->pos = 0;
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mb->partial_bit_count = 0;
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dv_decode_ac(s, mb, block, j, last_index);
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dv_decode_ac(s, mb, block, last_index);
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/* write the remaining bits in a new buffer only if the
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block is finished */
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bits_left = last_index - s->gb.index;
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if (mb->eob_reached[j]) {
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mb->partial_bit_count[j] = 0;
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mb->bits_left += bits_left;
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if (mb->eob_reached) {
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mb->partial_bit_count = 0;
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mb_bit_count += bits_left;
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bit_copy(&pb, &s->gb, bits_left);
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} else {
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/* should be < 16 bits otherwise a codeword could have
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been parsed */
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mb->partial_bit_count[j] = bits_left;
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mb->partial_bit_buffer[j] = get_bits(&s->gb, bits_left);
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mb->partial_bit_count = bits_left;
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mb->partial_bit_buffer = get_bits(&s->gb, bits_left);
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}
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block += 64;
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mb++;
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}
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flush_put_bits(&pb);
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/* pass 2 : we can do it just after */
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#ifdef VLC_DEBUG
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printf("***pass 2 size=%d\n", mb->bits_left);
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printf("***pass 2 size=%d\n", mb_bit_count);
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#endif
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block = block1;
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init_get_bits(&s->gb, mb->bit_buffer, 80);
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mb = mb1;
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init_get_bits(&s->gb, mb_bit_buffer, 80);
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for(j = 0;j < 6; j++) {
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if (!mb->eob_reached[j] && s->gb.index < mb->bits_left) {
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dv_decode_ac(s, mb, block, j, mb->bits_left);
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if (!mb->eob_reached && s->gb.index < mb_bit_count) {
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dv_decode_ac(s, mb, block, mb_bit_count);
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/* if still not finished, no need to parse other blocks */
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if (!mb->eob_reached[j]) {
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if (!mb->eob_reached) {
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/* we could not parse the current AC coefficient,
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so we add the remaining bytes */
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bits_left = mb->bits_left - s->gb.index;
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bits_left = mb_bit_count - s->gb.index;
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if (bits_left > 0) {
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mb->partial_bit_count[j] += bits_left;
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mb->partial_bit_buffer[j] =
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(mb->partial_bit_buffer[j] << bits_left) |
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mb->partial_bit_count += bits_left;
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mb->partial_bit_buffer =
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(mb->partial_bit_buffer << bits_left) |
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get_bits(&s->gb, bits_left);
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}
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goto next_mb;
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}
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}
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block += 64;
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mb++;
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}
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/* all blocks are finished, so the extra bytes can be used at
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the video segment level */
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bits_left = mb->bits_left - s->gb.index;
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bits_left = mb_bit_count - s->gb.index;
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vs_bit_count += bits_left;
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bit_copy(&vs_pb, &s->gb, bits_left);
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next_mb:
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mb++;
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mb1 += 6;
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block1 += 6 * 64;
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}
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@ -405,15 +428,15 @@ static inline void dv_decode_video_segment(DVVideoDecodeContext *s,
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init_get_bits(&s->gb, vs_bit_buffer, 5 * 80);
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for(mb_index = 0; mb_index < 5; mb_index++) {
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for(j = 0;j < 6; j++) {
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if (!mb->eob_reached[j]) {
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if (!mb->eob_reached) {
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#ifdef VLC_DEBUG
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printf("start %d:%d\n", mb_index, j);
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#endif
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dv_decode_ac(s, mb, block, j, vs_bit_count);
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dv_decode_ac(s, mb, block, vs_bit_count);
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}
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block += 64;
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mb++;
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}
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mb++;
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}
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/* compute idct and place blocks */
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@ -429,7 +452,7 @@ static inline void dv_decode_video_segment(DVVideoDecodeContext *s,
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else
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c_offset = ((mb_y >> 1) * s->linesize[1] * 8) + ((mb_x >> 1) * 8);
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for(j = 0;j < 6; j++) {
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idct_put = s->idct_put[mb->dct_mode[j]];
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idct_put = s->idct_put[mb->dct_mode];
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if (j < 4) {
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if (s->sampling_411) {
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idct_put(y_ptr + (j * 8), s->linesize[0], block);
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@ -443,8 +466,8 @@ static inline void dv_decode_video_segment(DVVideoDecodeContext *s,
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s->linesize[6 - j], block);
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}
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block += 64;
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mb++;
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}
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mb++;
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}
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}
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