Reduce stack memory allocation in MP3 decoder
Originally committed as revision 20451 to svn://svn.ffmpeg.org/ffmpeg/trunk
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c902340599
@ -88,7 +88,25 @@ typedef int32_t MPA_INT;
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#define BACKSTEP_SIZE 512
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#define EXTRABYTES 24
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struct GranuleDef;
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/* layer 3 "granule" */
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typedef struct GranuleDef {
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uint8_t scfsi;
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int part2_3_length;
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int big_values;
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int global_gain;
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int scalefac_compress;
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uint8_t block_type;
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uint8_t switch_point;
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int table_select[3];
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int subblock_gain[3];
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uint8_t scalefac_scale;
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uint8_t count1table_select;
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int region_size[3]; /* number of huffman codes in each region */
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int preflag;
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int short_start, long_end; /* long/short band indexes */
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uint8_t scale_factors[40];
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int32_t sb_hybrid[SBLIMIT * 18]; /* 576 samples */
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} GranuleDef;
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#define MPA_DECODE_HEADER \
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int frame_size; \
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@ -118,6 +136,7 @@ typedef struct MPADecodeContext {
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int synth_buf_offset[MPA_MAX_CHANNELS];
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DECLARE_ALIGNED_16(int32_t, sb_samples[MPA_MAX_CHANNELS][36][SBLIMIT]);
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int32_t mdct_buf[MPA_MAX_CHANNELS][SBLIMIT * 18]; /* previous samples, for layer 3 MDCT */
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GranuleDef granules[2][2]; /* Used in Layer 3 */
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#ifdef DEBUG
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int frame_count;
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#endif
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@ -49,26 +49,6 @@
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#define HEADER_SIZE 4
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/* layer 3 "granule" */
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typedef struct GranuleDef {
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uint8_t scfsi;
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int part2_3_length;
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int big_values;
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int global_gain;
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int scalefac_compress;
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uint8_t block_type;
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uint8_t switch_point;
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int table_select[3];
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int subblock_gain[3];
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uint8_t scalefac_scale;
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uint8_t count1table_select;
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int region_size[3]; /* number of huffman codes in each region */
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int preflag;
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int short_start, long_end; /* long/short band indexes */
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uint8_t scale_factors[40];
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int32_t sb_hybrid[SBLIMIT * 18]; /* 576 samples */
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} GranuleDef;
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#include "mpegaudiodata.h"
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#include "mpegaudiodectab.h"
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@ -1912,7 +1892,7 @@ static int mp_decode_layer3(MPADecodeContext *s)
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{
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int nb_granules, main_data_begin, private_bits;
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int gr, ch, blocksplit_flag, i, j, k, n, bits_pos;
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GranuleDef granules[2][2], *g;
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GranuleDef *g;
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int16_t exponents[576];
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/* read side info */
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@ -1928,15 +1908,15 @@ static int mp_decode_layer3(MPADecodeContext *s)
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private_bits = get_bits(&s->gb, 5);
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nb_granules = 2;
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for(ch=0;ch<s->nb_channels;ch++) {
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granules[ch][0].scfsi = 0; /* all scale factors are transmitted */
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granules[ch][1].scfsi = get_bits(&s->gb, 4);
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s->granules[ch][0].scfsi = 0;/* all scale factors are transmitted */
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s->granules[ch][1].scfsi = get_bits(&s->gb, 4);
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}
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}
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for(gr=0;gr<nb_granules;gr++) {
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for(ch=0;ch<s->nb_channels;ch++) {
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dprintf(s->avctx, "gr=%d ch=%d: side_info\n", gr, ch);
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g = &granules[ch][gr];
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g = &s->granules[ch][gr];
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g->part2_3_length = get_bits(&s->gb, 12);
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g->big_values = get_bits(&s->gb, 9);
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if(g->big_values > 288){
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@ -2008,7 +1988,7 @@ static int mp_decode_layer3(MPADecodeContext *s)
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for(gr=0;gr<nb_granules;gr++) {
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for(ch=0;ch<s->nb_channels;ch++) {
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g = &granules[ch][gr];
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g = &s->granules[ch][gr];
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if(get_bits_count(&s->gb)<0){
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av_log(s->avctx, AV_LOG_DEBUG, "mdb:%d, lastbuf:%d skipping granule %d\n",
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main_data_begin, s->last_buf_size, gr);
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@ -2052,7 +2032,7 @@ static int mp_decode_layer3(MPADecodeContext *s)
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g->scale_factors[j++] = 0;
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}
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} else {
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sc = granules[ch][0].scale_factors;
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sc = s->granules[ch][0].scale_factors;
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j = 0;
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for(k=0;k<4;k++) {
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n = (k == 0 ? 6 : 5);
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@ -2137,10 +2117,10 @@ static int mp_decode_layer3(MPADecodeContext *s)
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} /* ch */
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if (s->nb_channels == 2)
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compute_stereo(s, &granules[0][gr], &granules[1][gr]);
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compute_stereo(s, &s->granules[0][gr], &s->granules[1][gr]);
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for(ch=0;ch<s->nb_channels;ch++) {
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g = &granules[ch][gr];
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g = &s->granules[ch][gr];
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reorder_block(s, g);
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s->compute_antialias(s, g);
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