mirror of https://git.ffmpeg.org/ffmpeg.git
h261dec: Convert to the new bitstream reader
This commit is contained in:
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2b94ed12de
commit
2d72219554
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@ -26,12 +26,14 @@
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*/
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#include "avcodec.h"
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#include "bitstream.h"
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#include "mpeg_er.h"
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#include "mpegutils.h"
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#include "mpegvideo.h"
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#include "h263.h"
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#include "h261.h"
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#include "internal.h"
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#include "vlc.h"
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#define H261_MBA_VLC_BITS 9
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#define H261_MTYPE_VLC_BITS 6
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@ -103,18 +105,18 @@ static int h261_decode_gob_header(H261Context *h)
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if (!h->gob_start_code_skipped) {
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/* Check for GOB Start Code */
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val = show_bits(&s->gb, 15);
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val = bitstream_peek(&s->bc, 15);
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if (val)
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return -1;
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/* We have a GBSC */
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skip_bits(&s->gb, 16);
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bitstream_skip(&s->bc, 16);
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}
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h->gob_start_code_skipped = 0;
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h->gob_number = get_bits(&s->gb, 4); /* GN */
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s->qscale = get_bits(&s->gb, 5); /* GQUANT */
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h->gob_number = bitstream_read(&s->bc, 4); /* GN */
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s->qscale = bitstream_read(&s->bc, 5); /* GQUANT */
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/* Check if gob_number is valid */
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if (s->mb_height == 18) { // CIF
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@ -127,8 +129,8 @@ static int h261_decode_gob_header(H261Context *h)
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}
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/* GEI */
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while (get_bits1(&s->gb) != 0)
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skip_bits(&s->gb, 8);
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while (bitstream_read_bit(&s->bc) != 0)
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bitstream_skip(&s->bc, 8);
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if (s->qscale == 0) {
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av_log(s->avctx, AV_LOG_ERROR, "qscale has forbidden 0 value\n");
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@ -160,27 +162,27 @@ static int h261_resync(H261Context *h)
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if (ret >= 0)
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return 0;
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} else {
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if (show_bits(&s->gb, 15) == 0) {
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if (bitstream_peek(&s->bc, 15) == 0) {
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ret = h261_decode_gob_header(h);
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if (ret >= 0)
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return 0;
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}
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// OK, it is not where it is supposed to be ...
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s->gb = s->last_resync_gb;
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align_get_bits(&s->gb);
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left = get_bits_left(&s->gb);
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s->bc = s->last_resync_bc;
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bitstream_align(&s->bc);
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left = bitstream_bits_left(&s->bc);
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for (; left > 15 + 1 + 4 + 5; left -= 8) {
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if (show_bits(&s->gb, 15) == 0) {
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GetBitContext bak = s->gb;
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if (bitstream_peek(&s->bc, 15) == 0) {
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BitstreamContext bak = s->bc;
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ret = h261_decode_gob_header(h);
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if (ret >= 0)
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return 0;
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s->gb = bak;
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s->bc = bak;
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}
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skip_bits(&s->gb, 8);
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bitstream_skip(&s->bc, 8);
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}
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}
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@ -228,9 +230,9 @@ static const int mvmap[17] = {
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0, -1, -2, -3, -4, -5, -6, -7, -8, -9, -10, -11, -12, -13, -14, -15, -16
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};
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static int decode_mv_component(GetBitContext *gb, int v)
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static int decode_mv_component(BitstreamContext *bc, int v)
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{
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int mv_diff = get_vlc2(gb, h261_mv_vlc.table, H261_MV_VLC_BITS, 2);
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int mv_diff = bitstream_read_vlc(bc, h261_mv_vlc.table, H261_MV_VLC_BITS, 2);
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/* check if mv_diff is valid */
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if (mv_diff < 0)
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@ -238,7 +240,7 @@ static int decode_mv_component(GetBitContext *gb, int v)
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mv_diff = mvmap[mv_diff];
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if (mv_diff && !get_bits1(gb))
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if (mv_diff && !bitstream_read_bit(bc))
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mv_diff = -mv_diff;
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v += mv_diff;
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@ -270,7 +272,7 @@ static int h261_decode_block(H261Context *h, int16_t *block, int n, int coded)
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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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level = bitstream_read(&s->bc, 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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@ -288,10 +290,10 @@ static int h261_decode_block(H261Context *h, int16_t *block, int n, int coded)
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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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int check = bitstream_peek(&s->bc, 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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bitstream_skip(&s->bc, 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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@ -303,7 +305,7 @@ static int h261_decode_block(H261Context *h, int16_t *block, int n, int coded)
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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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code = bitstream_read_vlc(&s->bc, 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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@ -314,14 +316,14 @@ static int h261_decode_block(H261Context *h, int16_t *block, int n, int coded)
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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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run = bitstream_read(&s->bc, 6);
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level = bitstream_read_signed(&s->bc, 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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if (bitstream_read_bit(&s->bc))
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level = -level;
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}
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i += run;
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@ -346,8 +348,8 @@ static int h261_decode_mb(H261Context *h)
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cbp = 63;
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// Read mba
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do {
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h->mba_diff = get_vlc2(&s->gb, h261_mba_vlc.table,
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H261_MBA_VLC_BITS, 2);
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h->mba_diff = bitstream_read_vlc(&s->bc, h261_mba_vlc.table,
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H261_MBA_VLC_BITS, 2);
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/* Check for slice end */
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/* NOTE: GOB can be empty (no MB data) or exist only of MBA_stuffing */
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@ -358,7 +360,7 @@ static int h261_decode_mb(H261Context *h)
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} while (h->mba_diff == MBA_STUFFING); // stuffing
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if (h->mba_diff < 0) {
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if (get_bits_left(&s->gb) <= 7)
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if (bitstream_bits_left(&s->bc) <= 7)
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return SLICE_END;
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av_log(s->avctx, AV_LOG_ERROR, "illegal mba at %d %d\n", s->mb_x, s->mb_y);
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@ -378,7 +380,7 @@ static int h261_decode_mb(H261Context *h)
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ff_update_block_index(s);
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// Read mtype
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h->mtype = get_vlc2(&s->gb, h261_mtype_vlc.table, H261_MTYPE_VLC_BITS, 2);
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h->mtype = bitstream_read_vlc(&s->bc, h261_mtype_vlc.table, H261_MTYPE_VLC_BITS, 2);
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if (h->mtype < 0 || h->mtype >= FF_ARRAY_ELEMS(ff_h261_mtype_map)) {
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av_log(s->avctx, AV_LOG_ERROR, "Invalid mtype index %d\n",
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h->mtype);
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@ -388,7 +390,7 @@ static int h261_decode_mb(H261Context *h)
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// Read mquant
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if (IS_QUANT(h->mtype))
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ff_set_qscale(s, get_bits(&s->gb, 5));
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ff_set_qscale(s, bitstream_read(&s->bc, 5));
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s->mb_intra = IS_INTRA4x4(h->mtype);
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@ -408,8 +410,8 @@ static int h261_decode_mb(H261Context *h)
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h->current_mv_y = 0;
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}
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h->current_mv_x = decode_mv_component(&s->gb, h->current_mv_x);
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h->current_mv_y = decode_mv_component(&s->gb, h->current_mv_y);
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h->current_mv_x = decode_mv_component(&s->bc, h->current_mv_x);
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h->current_mv_y = decode_mv_component(&s->bc, h->current_mv_y);
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} else {
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h->current_mv_x = 0;
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h->current_mv_y = 0;
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@ -417,7 +419,7 @@ static int h261_decode_mb(H261Context *h)
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// Read cbp
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if (HAS_CBP(h->mtype))
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cbp = get_vlc2(&s->gb, h261_cbp_vlc.table, H261_CBP_VLC_BITS, 2) + 1;
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cbp = bitstream_read_vlc(&s->bc, h261_cbp_vlc.table, H261_CBP_VLC_BITS, 2) + 1;
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if (s->mb_intra) {
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s->current_picture.mb_type[xy] = MB_TYPE_INTRA;
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@ -460,8 +462,8 @@ static int h261_decode_picture_header(H261Context *h)
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int format, i;
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uint32_t startcode = 0;
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for (i = get_bits_left(&s->gb); i > 24; i -= 1) {
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startcode = ((startcode << 1) | get_bits(&s->gb, 1)) & 0x000FFFFF;
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for (i = bitstream_bits_left(&s->bc); i > 24; i -= 1) {
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startcode = ((startcode << 1) | bitstream_read(&s->bc, 1)) & 0x000FFFFF;
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if (startcode == 0x10)
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break;
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@ -473,7 +475,7 @@ static int h261_decode_picture_header(H261Context *h)
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}
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/* temporal reference */
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i = get_bits(&s->gb, 5); /* picture timestamp */
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i = bitstream_read(&s->bc, 5); /* picture timestamp */
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if (i < (s->picture_number & 31))
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i += 32;
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s->picture_number = (s->picture_number & ~31) + i;
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@ -481,11 +483,11 @@ static int h261_decode_picture_header(H261Context *h)
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s->avctx->framerate = (AVRational) { 30000, 1001 };
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/* PTYPE starts here */
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skip_bits1(&s->gb); /* split screen off */
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skip_bits1(&s->gb); /* camera off */
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skip_bits1(&s->gb); /* freeze picture release off */
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bitstream_skip(&s->bc, 1); /* split screen off */
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bitstream_skip(&s->bc, 1); /* camera off */
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bitstream_skip(&s->bc, 1); /* freeze picture release off */
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format = get_bits1(&s->gb);
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format = bitstream_read_bit(&s->bc);
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// only 2 formats possible
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if (format == 0) { // QCIF
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@ -502,12 +504,12 @@ static int h261_decode_picture_header(H261Context *h)
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s->mb_num = s->mb_width * s->mb_height;
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skip_bits1(&s->gb); /* still image mode off */
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skip_bits1(&s->gb); /* Reserved */
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bitstream_skip(&s->bc, 1); /* still image mode off */
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bitstream_skip(&s->bc, 1); /* Reserved */
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/* PEI */
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while (get_bits1(&s->gb) != 0)
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skip_bits(&s->gb, 8);
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while (bitstream_read_bit(&s->bc) != 0)
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bitstream_skip(&s->bc, 8);
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/* H.261 has no I-frames, but if we pass AV_PICTURE_TYPE_I for the first
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* frame, the codec crashes if it does not contain all I-blocks
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@ -552,7 +554,7 @@ static int h261_decode_gob(H261Context *h)
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*/
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static int get_consumed_bytes(MpegEncContext *s, int buf_size)
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{
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int pos = get_bits_count(&s->gb) >> 3;
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int pos = bitstream_tell(&s->bc) >> 3;
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if (pos == 0)
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pos = 1; // avoid infinite loops (i doubt that is needed but ...)
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if (pos + 10 > buf_size)
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@ -577,7 +579,7 @@ static int h261_decode_frame(AVCodecContext *avctx, void *data,
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h->gob_start_code_skipped = 0;
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retry:
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init_get_bits(&s->gb, buf, buf_size * 8);
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bitstream_init8(&s->bc, buf, buf_size);
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if (!s->context_initialized)
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// we need the IDCT permutation for reading a custom matrix
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@ -31,6 +31,7 @@
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#include <float.h>
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#include "avcodec.h"
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#include "bitstream.h"
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#include "blockdsp.h"
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#include "error_resilience.h"
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#include "fdctdsp.h"
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@ -344,6 +345,7 @@ typedef struct MpegEncContext {
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int resync_mb_x; ///< x position of last resync marker
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int resync_mb_y; ///< y position of last resync marker
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GetBitContext last_resync_gb; ///< used to search for the next resync marker
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BitstreamContext last_resync_bc; ///< used to search for the next resync marker
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int mb_num_left; ///< number of MBs left in this video packet (for partitioned Slices only)
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int next_p_frame_damaged; ///< set if the next p frame is damaged, to avoid showing trashed B-frames
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@ -428,6 +430,7 @@ typedef struct MpegEncContext {
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/* decompression specific */
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GetBitContext gb;
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BitstreamContext bc;
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/* MPEG-1 specific */
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int gop_picture_number; ///< index of the first picture of a GOP based on fake_pic_num & MPEG-1 specific
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@ -19,7 +19,8 @@
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "libavcodec/get_bits.h"
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#include "libavcodec/bitstream.h"
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#include "avformat.h"
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#include "rawdec.h"
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@ -31,16 +32,16 @@ static int h261_probe(AVProbeData *p)
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int invalid_psc=0;
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int next_gn=0;
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int src_fmt=0;
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GetBitContext gb;
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BitstreamContext bc;
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init_get_bits(&gb, p->buf, p->buf_size*8);
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bitstream_init(&bc, p->buf, p->buf_size * 8);
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for(i=0; i<p->buf_size*8; i++){
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if ((code & 0x01ff0000) || !(code & 0xff00)) {
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code = (code<<8) + get_bits(&gb, 8);
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code = (code << 8) + bitstream_read(&bc, 8);
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i += 7;
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} else
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code = (code<<1) + get_bits1(&gb);
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code = (code << 1) + bitstream_read_bit(&bc);
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if ((code & 0xffff0000) == 0x10000) {
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int gn= (code>>12)&0xf;
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if(!gn)
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