diff options
author | Laurent Aimar <fenrir@via.ecp.fr> | 2009-05-06 05:40:43 +0000 |
---|---|---|
committer | Kostya Shishkov <kostya.shishkov@gmail.com> | 2009-05-06 05:40:43 +0000 |
commit | 992f7db060736591b76656b55bf2bf6f8ea14be4 (patch) | |
tree | 43a52db30bd4da18e39ff250392f446a456cb408 | |
parent | cabb81113a09f23060f3aa21d68628302c6ff9c8 (diff) | |
download | ffmpeg-streaming-992f7db060736591b76656b55bf2bf6f8ea14be4.zip ffmpeg-streaming-992f7db060736591b76656b55bf2bf6f8ea14be4.tar.gz |
Add floating point audio decoding to WavPack decoder.
Patch by Laurent Aimar (fenrir at `antonym of 'audio'+antonym of 'WAN'` dot org)
Originally committed as revision 18754 to svn://svn.ffmpeg.org/ffmpeg/trunk
-rw-r--r-- | libavcodec/wavpack.c | 139 | ||||
-rw-r--r-- | libavformat/wv.c | 5 |
2 files changed, 131 insertions, 13 deletions
diff --git a/libavcodec/wavpack.c b/libavcodec/wavpack.c index b17c5a3..10254f0 100644 --- a/libavcodec/wavpack.c +++ b/libavcodec/wavpack.c @@ -37,6 +37,12 @@ #define WV_HYBRID_BITRATE 0x00000200 #define WV_HYBRID_BALANCE 0x00000400 +#define WV_FLT_SHIFT_ONES 0x01 +#define WV_FLT_SHIFT_SAME 0x02 +#define WV_FLT_SHIFT_SENT 0x04 +#define WV_FLT_ZERO_SENT 0x08 +#define WV_FLT_ZERO_SIGN 0x10 + enum WP_ID_Flags{ WP_IDF_MASK = 0x1F, WP_IDF_IGNORE = 0x20, @@ -97,6 +103,9 @@ typedef struct WavpackContext { int and, or, shift; int post_shift; int hybrid, hybrid_bitrate; + int float_flag; + int float_shift; + int float_max_exp; WvChannel ch[2]; } WavpackContext; @@ -357,6 +366,79 @@ static inline int wv_get_value_integer(WavpackContext *s, uint32_t *crc, int S) return (((S + bit) << s->shift) - bit) << s->post_shift; } +static float wv_get_value_float(WavpackContext *s, uint32_t *crc, int S) +{ + union { + float f; + uint32_t u; + } value; + + int sign; + int exp = s->float_max_exp; + + if(s->got_extra_bits){ + const int max_bits = 1 + 23 + 8 + 1; + const int left_bits = s->gb_extra_bits.size_in_bits - get_bits_count(&s->gb_extra_bits); + + if(left_bits + 8 * FF_INPUT_BUFFER_PADDING_SIZE < max_bits) + return 0.0; + } + + if(S){ + S <<= s->float_shift; + sign = S < 0; + if(sign) + S = -S; + if(S >= 0x1000000){ + if(s->got_extra_bits && get_bits1(&s->gb_extra_bits)){ + S = get_bits(&s->gb_extra_bits, 23); + }else{ + S = 0; + } + exp = 255; + }else if(exp){ + int shift = 23 - av_log2(S); + exp = s->float_max_exp; + if(exp <= shift){ + shift = --exp; + } + exp -= shift; + + if(shift){ + S <<= shift; + if((s->float_flag & WV_FLT_SHIFT_ONES) || + (s->got_extra_bits && (s->float_flag & WV_FLT_SHIFT_SAME) && get_bits1(&s->gb_extra_bits)) ){ + S |= (1 << shift) - 1; + } else if(s->got_extra_bits && (s->float_flag & WV_FLT_SHIFT_SENT)){ + S |= get_bits(&s->gb_extra_bits, shift); + } + } + }else{ + exp = s->float_max_exp; + } + S &= 0x7fffff; + }else{ + sign = 0; + exp = 0; + if(s->got_extra_bits && (s->float_flag & WV_FLT_ZERO_SENT)){ + if(get_bits1(&s->gb_extra_bits)){ + S = get_bits(&s->gb_extra_bits, 23); + if(s->float_max_exp >= 25) + exp = get_bits(&s->gb_extra_bits, 8); + sign = get_bits1(&s->gb_extra_bits); + }else{ + if(s->float_flag & WV_FLT_ZERO_SIGN) + sign = get_bits1(&s->gb_extra_bits); + } + } + } + + *crc = *crc * 27 + S * 9 + exp * 3 + sign; + + value.u = (sign << 31) | (exp << 23) | S; + return value.f; +} + static inline int wv_unpack_stereo(WavpackContext *s, GetBitContext *gb, void *dst, const int type) { int i, j, count = 0; @@ -367,6 +449,7 @@ static inline int wv_unpack_stereo(WavpackContext *s, GetBitContext *gb, void *d uint32_t crc_extra_bits = 0xFFFFFFFF; int16_t *dst16 = dst; int32_t *dst32 = dst; + float *dstfl = dst; s->one = s->zero = s->zeroes = 0; do{ @@ -445,7 +528,10 @@ static inline int wv_unpack_stereo(WavpackContext *s, GetBitContext *gb, void *d L += (R -= (L >> 1)); crc = (crc * 3 + L) * 3 + R; - if(type == SAMPLE_FMT_S32){ + if(type == SAMPLE_FMT_FLT){ + *dstfl++ = wv_get_value_float(s, &crc_extra_bits, L); + *dstfl++ = wv_get_value_float(s, &crc_extra_bits, R); + } else if(type == SAMPLE_FMT_S32){ *dst32++ = wv_get_value_integer(s, &crc_extra_bits, L); *dst32++ = wv_get_value_integer(s, &crc_extra_bits, R); } else { @@ -476,6 +562,7 @@ static inline int wv_unpack_mono(WavpackContext *s, GetBitContext *gb, void *dst uint32_t crc_extra_bits = 0xFFFFFFFF; int16_t *dst16 = dst; int32_t *dst32 = dst; + float *dstfl = dst; s->one = s->zero = s->zeroes = 0; do{ @@ -505,7 +592,9 @@ static inline int wv_unpack_mono(WavpackContext *s, GetBitContext *gb, void *dst pos = (pos + 1) & 7; crc = crc * 3 + S; - if(type == SAMPLE_FMT_S32) + if(type == SAMPLE_FMT_FLT) + *dstfl++ = wv_get_value_float(s, &crc_extra_bits, S); + else if(type == SAMPLE_FMT_S32) *dst32++ = wv_get_value_integer(s, &crc_extra_bits, S); else *dst16++ = wv_get_value_integer(s, &crc_extra_bits, S); @@ -547,7 +636,7 @@ static int wavpack_decode_frame(AVCodecContext *avctx, WavpackContext *s = avctx->priv_data; void *samples = data; int samplecount; - int got_terms = 0, got_weights = 0, got_samples = 0, got_entropy = 0, got_bs = 0; + int got_terms = 0, got_weights = 0, got_samples = 0, got_entropy = 0, got_bs = 0, got_float = 0; int got_hybrid = 0; const uint8_t* buf_end = buf + buf_size; int i, j, id, size, ssize, weights, t; @@ -570,7 +659,10 @@ static int wavpack_decode_frame(AVCodecContext *avctx, return buf_size; } s->frame_flags = AV_RL32(buf); buf += 4; - if((s->frame_flags&0x03) <= 1){ + if(s->frame_flags&0x80){ + bpp = sizeof(float); + avctx->sample_fmt = SAMPLE_FMT_FLT; + } else if((s->frame_flags&0x03) <= 1){ bpp = 2; avctx->sample_fmt = SAMPLE_FMT_S16; } else { @@ -742,6 +834,18 @@ static int wavpack_decode_frame(AVCodecContext *avctx, } buf += 4; break; + case WP_ID_FLOATINFO: + if(size != 4){ + av_log(avctx, AV_LOG_ERROR, "Invalid FLOATINFO, size = %i\n", size); + buf += ssize; + continue; + } + s->float_flag = buf[0]; + s->float_shift = buf[1]; + s->float_max_exp = buf[2]; + buf += 4; + got_float = 1; + break; case WP_ID_DATA: init_get_bits(&s->gb, buf, size * 8); s->data_size = size * 8; @@ -788,7 +892,11 @@ static int wavpack_decode_frame(AVCodecContext *avctx, av_log(avctx, AV_LOG_ERROR, "Packed samples not found\n"); return -1; } - if(s->got_extra_bits){ + if(!got_float && avctx->sample_fmt == SAMPLE_FMT_FLT){ + av_log(avctx, AV_LOG_ERROR, "Float information not found\n"); + return -1; + } + if(s->got_extra_bits && avctx->sample_fmt != SAMPLE_FMT_FLT){ const int size = s->gb_extra_bits.size_in_bits - get_bits_count(&s->gb_extra_bits); const int wanted = s->samples * s->extra_bits << s->stereo_in; if(size < wanted){ @@ -800,13 +908,19 @@ static int wavpack_decode_frame(AVCodecContext *avctx, if(s->stereo_in){ if(avctx->sample_fmt == SAMPLE_FMT_S16) samplecount = wv_unpack_stereo(s, &s->gb, samples, SAMPLE_FMT_S16); - else + else if(avctx->sample_fmt == SAMPLE_FMT_S32) samplecount = wv_unpack_stereo(s, &s->gb, samples, SAMPLE_FMT_S32); + else + samplecount = wv_unpack_stereo(s, &s->gb, samples, SAMPLE_FMT_FLT); + }else{ if(avctx->sample_fmt == SAMPLE_FMT_S16) samplecount = wv_unpack_mono(s, &s->gb, samples, SAMPLE_FMT_S16); - else + else if(avctx->sample_fmt == SAMPLE_FMT_S32) samplecount = wv_unpack_mono(s, &s->gb, samples, SAMPLE_FMT_S32); + else + samplecount = wv_unpack_mono(s, &s->gb, samples, SAMPLE_FMT_FLT); + if(s->stereo && avctx->sample_fmt == SAMPLE_FMT_S16){ int16_t *dst = (int16_t*)samples + samplecount * 2; int16_t *src = (int16_t*)samples + samplecount; @@ -816,7 +930,7 @@ static int wavpack_decode_frame(AVCodecContext *avctx, *--dst = *src; } samplecount *= 2; - }else if(s->stereo){ //32-bit output + }else if(s->stereo && avctx->sample_fmt == SAMPLE_FMT_S32){ int32_t *dst = (int32_t*)samples + samplecount * 2; int32_t *src = (int32_t*)samples + samplecount; int cnt = samplecount; @@ -825,6 +939,15 @@ static int wavpack_decode_frame(AVCodecContext *avctx, *--dst = *src; } samplecount *= 2; + }else if(s->stereo){ + float *dst = (float*)samples + samplecount * 2; + float *src = (float*)samples + samplecount; + int cnt = samplecount; + while(cnt--){ + *--dst = *--src; + *--dst = *src; + } + samplecount *= 2; } } *data_size = samplecount * bpp; diff --git a/libavformat/wv.c b/libavformat/wv.c index 1dda1fd..d46f90d 100644 --- a/libavformat/wv.c +++ b/libavformat/wv.c @@ -96,11 +96,6 @@ static int wv_read_block_header(AVFormatContext *ctx, ByteIOContext *pb) get_buffer(pb, wc->extra, WV_EXTRA_SIZE); wc->flags = AV_RL32(wc->extra + 4); //parse flags - if(wc->flags & WV_FLOAT){ - av_log(ctx, AV_LOG_ERROR, "Floating point data is not supported\n"); - return -1; - } - bpp = ((wc->flags & 3) + 1) << 3; chan = 1 + !(wc->flags & WV_MONO); rate = wv_rates[(wc->flags >> 23) & 0xF]; |