diff options
Diffstat (limited to 'libavcodec/g722.c')
| -rw-r--r-- | libavcodec/g722.c | 427 |
1 files changed, 8 insertions, 419 deletions
diff --git a/libavcodec/g722.c b/libavcodec/g722.c index 30c6f5313c..e8e74242b8 100644 --- a/libavcodec/g722.c +++ b/libavcodec/g722.c @@ -36,45 +36,8 @@ * respectively of each byte are ignored. */ -#include "avcodec.h" #include "mathops.h" -#include "get_bits.h" - -#define PREV_SAMPLES_BUF_SIZE 1024 - -#define FREEZE_INTERVAL 128 - -typedef struct { - int16_t prev_samples[PREV_SAMPLES_BUF_SIZE]; ///< memory of past decoded samples - int prev_samples_pos; ///< the number of values in prev_samples - - /** - * The band[0] and band[1] correspond respectively to the lower band and higher band. - */ - struct G722Band { - int16_t s_predictor; ///< predictor output value - int32_t s_zero; ///< previous output signal from zero predictor - int8_t part_reconst_mem[2]; ///< signs of previous partially reconstructed signals - int16_t prev_qtzd_reconst; ///< previous quantized reconstructed signal (internal value, using low_inv_quant4) - int16_t pole_mem[2]; ///< second-order pole section coefficient buffer - int32_t diff_mem[6]; ///< quantizer difference signal memory - int16_t zero_mem[6]; ///< Seventh-order zero section coefficient buffer - int16_t log_factor; ///< delayed 2-logarithmic quantizer factor - int16_t scale_factor; ///< delayed quantizer scale factor - } band[2]; - - struct TrellisNode { - struct G722Band state; - uint32_t ssd; - int path; - } *node_buf[2], **nodep_buf[2]; - - struct TrellisPath { - int value; - int prev; - } *paths[2]; -} G722Context; - +#include "g722.h" static const int8_t sign_lookup[2] = { -1, 1 }; @@ -85,7 +48,7 @@ static const int16_t inv_log2_table[32] = { 3444, 3520, 3597, 3676, 3756, 3838, 3922, 4008 }; static const int16_t high_log_factor_step[2] = { 798, -214 }; -static const int16_t high_inv_quant[4] = { -926, -202, 926, 202 }; +const int16_t ff_g722_high_inv_quant[4] = { -926, -202, 926, 202 }; /** * low_log_factor_step[index] == wl[rl42[index]] */ @@ -93,11 +56,11 @@ static const int16_t low_log_factor_step[16] = { -60, 3042, 1198, 538, 334, 172, 58, -30, 3042, 1198, 538, 334, 172, 58, -30, -60 }; -static const int16_t low_inv_quant4[16] = { +const int16_t ff_g722_low_inv_quant4[16] = { 0, -2557, -1612, -1121, -786, -530, -323, -150, 2557, 1612, 1121, 786, 530, 323, 150, 0 }; -static const int16_t low_inv_quant6[64] = { +const int16_t ff_g722_low_inv_quant6[64] = { -17, -17, -17, -17, -3101, -2738, -2376, -2088, -1873, -1689, -1535, -1399, -1279, -1170, -1072, -982, -899, -822, -750, -682, -618, -558, -501, -447, @@ -173,10 +136,10 @@ static int inline linear_scale_factor(const int log_factor) return shift < 0 ? wd1 >> -shift : wd1 << shift; } -static void update_low_predictor(struct G722Band *band, const int ilow) +void ff_g722_update_low_predictor(struct G722Band *band, const int ilow) { do_adaptive_prediction(band, - band->scale_factor * low_inv_quant4[ilow] >> 10); + band->scale_factor * ff_g722_low_inv_quant4[ilow] >> 10); // quantizer adaptation band->log_factor = av_clip((band->log_factor * 127 >> 7) + @@ -184,7 +147,7 @@ static void update_low_predictor(struct G722Band *band, const int ilow) band->scale_factor = linear_scale_factor(band->log_factor - (8 << 11)); } -static void update_high_predictor(struct G722Band *band, const int dhigh, +void ff_g722_update_high_predictor(struct G722Band *band, const int dhigh, const int ihigh) { do_adaptive_prediction(band, dhigh); @@ -195,7 +158,7 @@ static void update_high_predictor(struct G722Band *band, const int dhigh, band->scale_factor = linear_scale_factor(band->log_factor - (10 << 11)); } -static void apply_qmf(const int16_t *prev_samples, int *xout1, int *xout2) +void ff_g722_apply_qmf(const int16_t *prev_samples, int *xout1, int *xout2) { int i; @@ -206,377 +169,3 @@ static void apply_qmf(const int16_t *prev_samples, int *xout1, int *xout2) MAC16(*xout1, prev_samples[2*i+1], qmf_coeffs[11-i]); } } - -static av_cold int g722_init(AVCodecContext * avctx) -{ - G722Context *c = avctx->priv_data; - - if (avctx->channels != 1) { - av_log(avctx, AV_LOG_ERROR, "Only mono tracks are allowed.\n"); - return AVERROR_INVALIDDATA; - } - avctx->sample_fmt = AV_SAMPLE_FMT_S16; - - switch (avctx->bits_per_coded_sample) { - case 8: - case 7: - case 6: - break; - default: - av_log(avctx, AV_LOG_WARNING, "Unsupported bits_per_coded_sample [%d], " - "assuming 8\n", - avctx->bits_per_coded_sample); - case 0: - avctx->bits_per_coded_sample = 8; - break; - } - - c->band[0].scale_factor = 8; - c->band[1].scale_factor = 2; - c->prev_samples_pos = 22; - - if (avctx->lowres) - avctx->sample_rate /= 2; - - if (avctx->trellis) { - int frontier = 1 << avctx->trellis; - int max_paths = frontier * FREEZE_INTERVAL; - int i; - for (i = 0; i < 2; i++) { - c->paths[i] = av_mallocz(max_paths * sizeof(**c->paths)); - c->node_buf[i] = av_mallocz(2 * frontier * sizeof(**c->node_buf)); - c->nodep_buf[i] = av_mallocz(2 * frontier * sizeof(**c->nodep_buf)); - } - } - - return 0; -} - -static av_cold int g722_close(AVCodecContext *avctx) -{ - G722Context *c = avctx->priv_data; - int i; - for (i = 0; i < 2; i++) { - av_freep(&c->paths[i]); - av_freep(&c->node_buf[i]); - av_freep(&c->nodep_buf[i]); - } - return 0; -} - -#if CONFIG_ADPCM_G722_DECODER -static const int16_t low_inv_quant5[32] = { - -35, -35, -2919, -2195, -1765, -1458, -1219, -1023, - -858, -714, -587, -473, -370, -276, -190, -110, - 2919, 2195, 1765, 1458, 1219, 1023, 858, 714, - 587, 473, 370, 276, 190, 110, 35, -35 -}; - -static const int16_t *low_inv_quants[3] = { low_inv_quant6, low_inv_quant5, - low_inv_quant4 }; - -static int g722_decode_frame(AVCodecContext *avctx, void *data, - int *data_size, AVPacket *avpkt) -{ - G722Context *c = avctx->priv_data; - int16_t *out_buf = data; - int j, out_len = 0; - const int skip = 8 - avctx->bits_per_coded_sample; - const int16_t *quantizer_table = low_inv_quants[skip]; - GetBitContext gb; - - init_get_bits(&gb, avpkt->data, avpkt->size * 8); - - for (j = 0; j < avpkt->size; j++) { - int ilow, ihigh, rlow; - - ihigh = get_bits(&gb, 2); - ilow = get_bits(&gb, 6 - skip); - skip_bits(&gb, skip); - - rlow = av_clip((c->band[0].scale_factor * quantizer_table[ilow] >> 10) - + c->band[0].s_predictor, -16384, 16383); - - update_low_predictor(&c->band[0], ilow >> (2 - skip)); - - if (!avctx->lowres) { - const int dhigh = c->band[1].scale_factor * - high_inv_quant[ihigh] >> 10; - const int rhigh = av_clip(dhigh + c->band[1].s_predictor, - -16384, 16383); - int xout1, xout2; - - update_high_predictor(&c->band[1], dhigh, ihigh); - - c->prev_samples[c->prev_samples_pos++] = rlow + rhigh; - c->prev_samples[c->prev_samples_pos++] = rlow - rhigh; - apply_qmf(c->prev_samples + c->prev_samples_pos - 24, - &xout1, &xout2); - out_buf[out_len++] = av_clip_int16(xout1 >> 12); - out_buf[out_len++] = av_clip_int16(xout2 >> 12); - if (c->prev_samples_pos >= PREV_SAMPLES_BUF_SIZE) { - memmove(c->prev_samples, - c->prev_samples + c->prev_samples_pos - 22, - 22 * sizeof(c->prev_samples[0])); - c->prev_samples_pos = 22; - } - } else - out_buf[out_len++] = rlow; - } - *data_size = out_len << 1; - return avpkt->size; -} - -AVCodec ff_adpcm_g722_decoder = { - .name = "g722", - .type = AVMEDIA_TYPE_AUDIO, - .id = CODEC_ID_ADPCM_G722, - .priv_data_size = sizeof(G722Context), - .init = g722_init, - .decode = g722_decode_frame, - .long_name = NULL_IF_CONFIG_SMALL("G.722 ADPCM"), - .max_lowres = 1, -}; -#endif - -#if CONFIG_ADPCM_G722_ENCODER -static const int16_t low_quant[33] = { - 35, 72, 110, 150, 190, 233, 276, 323, - 370, 422, 473, 530, 587, 650, 714, 786, - 858, 940, 1023, 1121, 1219, 1339, 1458, 1612, - 1765, 1980, 2195, 2557, 2919 -}; - -static inline void filter_samples(G722Context *c, const int16_t *samples, - int *xlow, int *xhigh) -{ - int xout1, xout2; - c->prev_samples[c->prev_samples_pos++] = samples[0]; - c->prev_samples[c->prev_samples_pos++] = samples[1]; - apply_qmf(c->prev_samples + c->prev_samples_pos - 24, &xout1, &xout2); - *xlow = xout1 + xout2 >> 13; - *xhigh = xout1 - xout2 >> 13; - if (c->prev_samples_pos >= PREV_SAMPLES_BUF_SIZE) { - memmove(c->prev_samples, - c->prev_samples + c->prev_samples_pos - 22, - 22 * sizeof(c->prev_samples[0])); - c->prev_samples_pos = 22; - } -} - -static inline int encode_high(const struct G722Band *state, int xhigh) -{ - int diff = av_clip_int16(xhigh - state->s_predictor); - int pred = 141 * state->scale_factor >> 8; - /* = diff >= 0 ? (diff < pred) + 2 : diff >= -pred */ - return ((diff ^ (diff >> (sizeof(diff)*8-1))) < pred) + 2*(diff >= 0); -} - -static inline int encode_low(const struct G722Band* state, int xlow) -{ - int diff = av_clip_int16(xlow - state->s_predictor); - /* = diff >= 0 ? diff : -(diff + 1) */ - int limit = diff ^ (diff >> (sizeof(diff)*8-1)); - int i = 0; - limit = limit + 1 << 10; - if (limit > low_quant[8] * state->scale_factor) - i = 9; - while (i < 29 && limit > low_quant[i] * state->scale_factor) - i++; - return (diff < 0 ? (i < 2 ? 63 : 33) : 61) - i; -} - -static int g722_encode_trellis(AVCodecContext *avctx, - uint8_t *dst, int buf_size, void *data) -{ - G722Context *c = avctx->priv_data; - const int16_t *samples = data; - int i, j, k; - int frontier = 1 << avctx->trellis; - struct TrellisNode **nodes[2]; - struct TrellisNode **nodes_next[2]; - int pathn[2] = {0, 0}, froze = -1; - struct TrellisPath *p[2]; - - for (i = 0; i < 2; i++) { - nodes[i] = c->nodep_buf[i]; - nodes_next[i] = c->nodep_buf[i] + frontier; - memset(c->nodep_buf[i], 0, 2 * frontier * sizeof(*c->nodep_buf)); - nodes[i][0] = c->node_buf[i] + frontier; - nodes[i][0]->ssd = 0; - nodes[i][0]->path = 0; - nodes[i][0]->state = c->band[i]; - } - - for (i = 0; i < buf_size >> 1; i++) { - int xlow, xhigh; - struct TrellisNode *next[2]; - int heap_pos[2] = {0, 0}; - - for (j = 0; j < 2; j++) { - next[j] = c->node_buf[j] + frontier*(i & 1); - memset(nodes_next[j], 0, frontier * sizeof(**nodes_next)); - } - - filter_samples(c, &samples[2*i], &xlow, &xhigh); - - for (j = 0; j < frontier && nodes[0][j]; j++) { - /* Only k >> 2 affects the future adaptive state, therefore testing - * small steps that don't change k >> 2 is useless, the orignal - * value from encode_low is better than them. Since we step k - * in steps of 4, make sure range is a multiple of 4, so that - * we don't miss the original value from encode_low. */ - int range = j < frontier/2 ? 4 : 0; - struct TrellisNode *cur_node = nodes[0][j]; - - int ilow = encode_low(&cur_node->state, xlow); - - for (k = ilow - range; k <= ilow + range && k <= 63; k += 4) { - int decoded, dec_diff, pos; - uint32_t ssd; - struct TrellisNode* node; - - if (k < 0) - continue; - - decoded = av_clip((cur_node->state.scale_factor * - low_inv_quant6[k] >> 10) - + cur_node->state.s_predictor, -16384, 16383); - dec_diff = xlow - decoded; - -#define STORE_NODE(index, UPDATE, VALUE)\ - ssd = cur_node->ssd + dec_diff*dec_diff;\ - /* Check for wraparound. Using 64 bit ssd counters would \ - * be simpler, but is slower on x86 32 bit. */\ - if (ssd < cur_node->ssd)\ - continue;\ - if (heap_pos[index] < frontier) {\ - pos = heap_pos[index]++;\ - assert(pathn[index] < FREEZE_INTERVAL * frontier);\ - node = nodes_next[index][pos] = next[index]++;\ - node->path = pathn[index]++;\ - } else {\ - /* Try to replace one of the leaf nodes with the new \ - * one, but not always testing the same leaf position */\ - pos = (frontier>>1) + (heap_pos[index] & ((frontier>>1) - 1));\ - if (ssd >= nodes_next[index][pos]->ssd)\ - continue;\ - heap_pos[index]++;\ - node = nodes_next[index][pos];\ - }\ - node->ssd = ssd;\ - node->state = cur_node->state;\ - UPDATE;\ - c->paths[index][node->path].value = VALUE;\ - c->paths[index][node->path].prev = cur_node->path;\ - /* Sift the newly inserted node up in the heap to restore \ - * the heap property */\ - while (pos > 0) {\ - int parent = (pos - 1) >> 1;\ - if (nodes_next[index][parent]->ssd <= ssd)\ - break;\ - FFSWAP(struct TrellisNode*, nodes_next[index][parent],\ - nodes_next[index][pos]);\ - pos = parent;\ - } - STORE_NODE(0, update_low_predictor(&node->state, k >> 2), k); - } - } - - for (j = 0; j < frontier && nodes[1][j]; j++) { - int ihigh; - struct TrellisNode *cur_node = nodes[1][j]; - - /* We don't try to get any initial guess for ihigh via - * encode_high - since there's only 4 possible values, test - * them all. Testing all of these gives a much, much larger - * gain than testing a larger range around ilow. */ - for (ihigh = 0; ihigh < 4; ihigh++) { - int dhigh, decoded, dec_diff, pos; - uint32_t ssd; - struct TrellisNode* node; - - dhigh = cur_node->state.scale_factor * - high_inv_quant[ihigh] >> 10; - decoded = av_clip(dhigh + cur_node->state.s_predictor, - -16384, 16383); - dec_diff = xhigh - decoded; - - STORE_NODE(1, update_high_predictor(&node->state, dhigh, ihigh), ihigh); - } - } - - for (j = 0; j < 2; j++) { - FFSWAP(struct TrellisNode**, nodes[j], nodes_next[j]); - - if (nodes[j][0]->ssd > (1 << 16)) { - for (k = 1; k < frontier && nodes[j][k]; k++) - nodes[j][k]->ssd -= nodes[j][0]->ssd; - nodes[j][0]->ssd = 0; - } - } - - if (i == froze + FREEZE_INTERVAL) { - p[0] = &c->paths[0][nodes[0][0]->path]; - p[1] = &c->paths[1][nodes[1][0]->path]; - for (j = i; j > froze; j--) { - dst[j] = p[1]->value << 6 | p[0]->value; - p[0] = &c->paths[0][p[0]->prev]; - p[1] = &c->paths[1][p[1]->prev]; - } - froze = i; - pathn[0] = pathn[1] = 0; - memset(nodes[0] + 1, 0, (frontier - 1)*sizeof(**nodes)); - memset(nodes[1] + 1, 0, (frontier - 1)*sizeof(**nodes)); - } - } - - p[0] = &c->paths[0][nodes[0][0]->path]; - p[1] = &c->paths[1][nodes[1][0]->path]; - for (j = i; j > froze; j--) { - dst[j] = p[1]->value << 6 | p[0]->value; - p[0] = &c->paths[0][p[0]->prev]; - p[1] = &c->paths[1][p[1]->prev]; - } - c->band[0] = nodes[0][0]->state; - c->band[1] = nodes[1][0]->state; - - return i; -} - -static int g722_encode_frame(AVCodecContext *avctx, - uint8_t *dst, int buf_size, void *data) -{ - G722Context *c = avctx->priv_data; - const int16_t *samples = data; - int i; - - if (avctx->trellis) - return g722_encode_trellis(avctx, dst, buf_size, data); - - for (i = 0; i < buf_size >> 1; i++) { - int xlow, xhigh, ihigh, ilow; - filter_samples(c, &samples[2*i], &xlow, &xhigh); - ihigh = encode_high(&c->band[1], xhigh); - ilow = encode_low(&c->band[0], xlow); - update_high_predictor(&c->band[1], c->band[1].scale_factor * - high_inv_quant[ihigh] >> 10, ihigh); - update_low_predictor(&c->band[0], ilow >> 2); - *dst++ = ihigh << 6 | ilow; - } - return i; -} - -AVCodec ff_adpcm_g722_encoder = { - .name = "g722", - .type = AVMEDIA_TYPE_AUDIO, - .id = CODEC_ID_ADPCM_G722, - .priv_data_size = sizeof(G722Context), - .init = g722_init, - .close = g722_close, - .encode = g722_encode_frame, - .long_name = NULL_IF_CONFIG_SMALL("G.722 ADPCM"), - .sample_fmts = (const enum AVSampleFormat[]){AV_SAMPLE_FMT_S16,AV_SAMPLE_FMT_NONE}, -}; -#endif - |