h261: cosmetics: Move functions to avoid forward declarations
This commit is contained in:
Diego Biurrun
parent
b78f81c803
commit
0404ec619d
@ -44,8 +44,6 @@ static VLC h261_mtype_vlc;
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static VLC h261_mv_vlc;
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static VLC h261_cbp_vlc;
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static int h261_decode_block(H261Context *h, int16_t *block, int n, int coded);
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static av_cold void h261_decode_init_vlc(H261Context *h)
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{
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static int done = 0;
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@ -246,6 +244,94 @@ static int decode_mv_component(GetBitContext *gb, int v)
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return v;
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}
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/**
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* Decode a macroblock.
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* @return <0 if an error occurred
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*/
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static int h261_decode_block(H261Context *h, int16_t *block, int n, int coded)
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{
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MpegEncContext *const s = &h->s;
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int code, level, i, j, run;
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RLTable *rl = &h261_rl_tcoeff;
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const uint8_t *scan_table;
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/* For the variable length encoding there are two code tables, one being
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* used for the first transmitted LEVEL in INTER, INTER + MC and
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* INTER + MC + FIL blocks, the second for all other LEVELs except the
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* first one in INTRA blocks which is fixed length coded with 8 bits.
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* NOTE: The two code tables only differ in one VLC so we handle that
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* manually. */
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scan_table = s->intra_scantable.permutated;
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if (s->mb_intra) {
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/* DC coef */
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level = get_bits(&s->gb, 8);
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// 0 (00000000b) and -128 (10000000b) are FORBIDDEN
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if ((level & 0x7F) == 0) {
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av_log(s->avctx, AV_LOG_ERROR, "illegal dc %d at %d %d\n",
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level, s->mb_x, s->mb_y);
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return -1;
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}
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/* The code 1000 0000 is not used, the reconstruction level of 1024
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* being coded as 1111 1111. */
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if (level == 255)
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level = 128;
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block[0] = level;
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i = 1;
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} else if (coded) {
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// Run Level Code
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// EOB Not possible for first level when cbp is available (that's why the table is different)
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// 0 1 1s
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// * * 0*
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int check = show_bits(&s->gb, 2);
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i = 0;
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if (check & 0x2) {
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skip_bits(&s->gb, 2);
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block[0] = (check & 0x1) ? -1 : 1;
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i = 1;
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}
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} else {
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i = 0;
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}
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if (!coded) {
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s->block_last_index[n] = i - 1;
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return 0;
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}
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for (;;) {
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code = get_vlc2(&s->gb, rl->vlc.table, TCOEFF_VLC_BITS, 2);
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if (code < 0) {
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av_log(s->avctx, AV_LOG_ERROR, "illegal ac vlc code at %dx%d\n",
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s->mb_x, s->mb_y);
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return -1;
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}
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if (code == rl->n) {
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/* escape */
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/* The remaining combinations of (run, level) are encoded with a
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* 20-bit word consisting of 6 bits escape, 6 bits run and 8 bits
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* level. */
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run = get_bits(&s->gb, 6);
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level = get_sbits(&s->gb, 8);
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} else if (code == 0) {
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break;
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} else {
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run = rl->table_run[code];
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level = rl->table_level[code];
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if (get_bits1(&s->gb))
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level = -level;
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}
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i += run;
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if (i >= 64) {
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av_log(s->avctx, AV_LOG_ERROR, "run overflow at %dx%d\n",
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s->mb_x, s->mb_y);
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return -1;
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}
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j = scan_table[i];
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block[j] = level;
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i++;
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}
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s->block_last_index[n] = i - 1;
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return 0;
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}
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static int h261_decode_mb(H261Context *h)
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{
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MpegEncContext *const s = &h->s;
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@ -353,94 +439,6 @@ intra:
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return SLICE_OK;
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}
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/**
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* Decode a macroblock.
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* @return <0 if an error occurred
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*/
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static int h261_decode_block(H261Context *h, int16_t *block, int n, int coded)
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{
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MpegEncContext *const s = &h->s;
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int code, level, i, j, run;
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RLTable *rl = &h261_rl_tcoeff;
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const uint8_t *scan_table;
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/* For the variable length encoding there are two code tables, one being
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* used for the first transmitted LEVEL in INTER, INTER + MC and
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* INTER + MC + FIL blocks, the second for all other LEVELs except the
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* first one in INTRA blocks which is fixed length coded with 8 bits.
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* NOTE: The two code tables only differ in one VLC so we handle that
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* manually. */
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scan_table = s->intra_scantable.permutated;
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if (s->mb_intra) {
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/* DC coef */
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level = get_bits(&s->gb, 8);
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// 0 (00000000b) and -128 (10000000b) are FORBIDDEN
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if ((level & 0x7F) == 0) {
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av_log(s->avctx, AV_LOG_ERROR, "illegal dc %d at %d %d\n",
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level, s->mb_x, s->mb_y);
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return -1;
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}
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/* The code 1000 0000 is not used, the reconstruction level of 1024
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* being coded as 1111 1111. */
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if (level == 255)
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level = 128;
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block[0] = level;
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i = 1;
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} else if (coded) {
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// Run Level Code
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// EOB Not possible for first level when cbp is available (that's why the table is different)
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// 0 1 1s
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// * * 0*
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int check = show_bits(&s->gb, 2);
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i = 0;
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if (check & 0x2) {
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skip_bits(&s->gb, 2);
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block[0] = (check & 0x1) ? -1 : 1;
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i = 1;
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}
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} else {
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i = 0;
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}
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if (!coded) {
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s->block_last_index[n] = i - 1;
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return 0;
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}
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for (;;) {
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code = get_vlc2(&s->gb, rl->vlc.table, TCOEFF_VLC_BITS, 2);
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if (code < 0) {
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av_log(s->avctx, AV_LOG_ERROR, "illegal ac vlc code at %dx%d\n",
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s->mb_x, s->mb_y);
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return -1;
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}
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if (code == rl->n) {
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/* escape */
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/* The remaining combinations of (run, level) are encoded with a
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* 20-bit word consisting of 6 bits escape, 6 bits run and 8 bits
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* level. */
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run = get_bits(&s->gb, 6);
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level = get_sbits(&s->gb, 8);
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} else if (code == 0) {
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break;
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} else {
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run = rl->table_run[code];
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level = rl->table_level[code];
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if (get_bits1(&s->gb))
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level = -level;
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}
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i += run;
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if (i >= 64) {
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av_log(s->avctx, AV_LOG_ERROR, "run overflow at %dx%d\n",
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s->mb_x, s->mb_y);
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return -1;
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}
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j = scan_table[i];
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block[j] = level;
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i++;
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}
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s->block_last_index[n] = i - 1;
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return 0;
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}
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/**
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* Decode the H.261 picture header.
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* @return <0 if no startcode found
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@ -31,9 +31,6 @@
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#include "h261.h"
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#include "h261data.h"
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static void h261_encode_block(H261Context *h, int16_t *block,
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int n);
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int ff_h261_get_picture_format(int width, int height)
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{
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// QCIF
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@ -155,6 +152,79 @@ static inline int get_cbp(MpegEncContext *s, int16_t block[6][64])
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return cbp;
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}
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/**
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* Encode an 8x8 block.
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* @param block the 8x8 block
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* @param n block index (0-3 are luma, 4-5 are chroma)
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*/
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static void h261_encode_block(H261Context *h, int16_t *block, int n)
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{
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MpegEncContext *const s = &h->s;
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int level, run, i, j, last_index, last_non_zero, sign, slevel, code;
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RLTable *rl;
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rl = &h261_rl_tcoeff;
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if (s->mb_intra) {
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/* DC coef */
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level = block[0];
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/* 255 cannot be represented, so we clamp */
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if (level > 254) {
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level = 254;
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block[0] = 254;
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}
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/* 0 cannot be represented also */
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else if (level < 1) {
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level = 1;
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block[0] = 1;
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}
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if (level == 128)
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put_bits(&s->pb, 8, 0xff);
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else
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put_bits(&s->pb, 8, level);
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i = 1;
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} else if ((block[0] == 1 || block[0] == -1) &&
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(s->block_last_index[n] > -1)) {
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// special case
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put_bits(&s->pb, 2, block[0] > 0 ? 2 : 3);
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i = 1;
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} else {
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i = 0;
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}
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/* AC coefs */
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last_index = s->block_last_index[n];
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last_non_zero = i - 1;
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for (; i <= last_index; i++) {
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j = s->intra_scantable.permutated[i];
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level = block[j];
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if (level) {
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run = i - last_non_zero - 1;
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sign = 0;
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slevel = level;
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if (level < 0) {
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sign = 1;
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level = -level;
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}
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code = get_rl_index(rl, 0 /*no last in H.261, EOB is used*/,
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run, level);
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if (run == 0 && level < 16)
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code += 1;
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put_bits(&s->pb, rl->table_vlc[code][1], rl->table_vlc[code][0]);
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if (code == rl->n) {
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put_bits(&s->pb, 6, run);
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assert(slevel != 0);
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assert(level <= 127);
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put_sbits(&s->pb, 8, slevel);
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} else {
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put_bits(&s->pb, 1, sign);
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}
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last_non_zero = i;
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}
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}
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if (last_index > -1)
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put_bits(&s->pb, rl->table_vlc[0][1], rl->table_vlc[0][0]); // EOB
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}
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void ff_h261_encode_mb(MpegEncContext *s, int16_t block[6][64],
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int motion_x, int motion_y)
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{
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@ -252,79 +322,6 @@ void ff_h261_encode_init(MpegEncContext *s)
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s->c_dc_scale_table = ff_mpeg1_dc_scale_table;
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}
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/**
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* Encode an 8x8 block.
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* @param block the 8x8 block
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* @param n block index (0-3 are luma, 4-5 are chroma)
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*/
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static void h261_encode_block(H261Context *h, int16_t *block, int n)
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{
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MpegEncContext *const s = &h->s;
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int level, run, i, j, last_index, last_non_zero, sign, slevel, code;
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RLTable *rl;
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rl = &h261_rl_tcoeff;
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if (s->mb_intra) {
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/* DC coef */
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level = block[0];
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/* 255 cannot be represented, so we clamp */
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if (level > 254) {
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level = 254;
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block[0] = 254;
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}
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/* 0 cannot be represented also */
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else if (level < 1) {
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level = 1;
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block[0] = 1;
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}
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if (level == 128)
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put_bits(&s->pb, 8, 0xff);
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else
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put_bits(&s->pb, 8, level);
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i = 1;
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} else if ((block[0] == 1 || block[0] == -1) &&
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(s->block_last_index[n] > -1)) {
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// special case
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put_bits(&s->pb, 2, block[0] > 0 ? 2 : 3);
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i = 1;
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} else {
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i = 0;
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}
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/* AC coefs */
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last_index = s->block_last_index[n];
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last_non_zero = i - 1;
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for (; i <= last_index; i++) {
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j = s->intra_scantable.permutated[i];
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level = block[j];
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if (level) {
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run = i - last_non_zero - 1;
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sign = 0;
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slevel = level;
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if (level < 0) {
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sign = 1;
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level = -level;
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}
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code = get_rl_index(rl, 0 /*no last in H.261, EOB is used*/,
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run, level);
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if (run == 0 && level < 16)
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code += 1;
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put_bits(&s->pb, rl->table_vlc[code][1], rl->table_vlc[code][0]);
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if (code == rl->n) {
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put_bits(&s->pb, 6, run);
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assert(slevel != 0);
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assert(level <= 127);
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put_sbits(&s->pb, 8, slevel);
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} else {
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put_bits(&s->pb, 1, sign);
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}
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last_non_zero = i;
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}
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}
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if (last_index > -1)
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put_bits(&s->pb, rl->table_vlc[0][1], rl->table_vlc[0][0]); // EOB
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}
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FF_MPV_GENERIC_CLASS(h261)
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AVCodec ff_h261_encoder = {
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