From d615187f74ddf3413778a8b5b7ae17255b0df88e Mon Sep 17 00:00:00 2001 From: Alex Converse Date: Wed, 21 Jan 2015 21:51:54 -0800 Subject: aacdec: Support for ER AAC ELD 480. Based in part on work from Niel van der Westhuizen . --- libavcodec/aacdec.c | 38 ++++++++++++++++++++++++++------------ 1 file changed, 26 insertions(+), 12 deletions(-) (limited to 'libavcodec/aacdec.c') diff --git a/libavcodec/aacdec.c b/libavcodec/aacdec.c index f868b7f94e..9a931824e8 100644 --- a/libavcodec/aacdec.c +++ b/libavcodec/aacdec.c @@ -85,6 +85,7 @@ #include "internal.h" #include "get_bits.h" #include "fft.h" +#include "imdct15.h" #include "fmtconvert.h" #include "lpc.h" #include "kbdwin.h" @@ -719,6 +720,7 @@ static int decode_ga_specific_config(AACContext *ac, AVCodecContext *avctx, avpriv_request_sample(avctx, "960/120 MDCT window"); return AVERROR_PATCHWELCOME; } + m4ac->frame_length_short = 0; if (get_bits1(gb)) // dependsOnCoreCoder skip_bits(gb, 14); // coreCoderDelay @@ -796,11 +798,7 @@ static int decode_eld_specific_config(AACContext *ac, AVCodecContext *avctx, m4ac->ps = 0; m4ac->sbr = 0; - if (get_bits1(gb)) { // frameLengthFlag - avpriv_request_sample(avctx, "960/120 MDCT window"); - return AVERROR_PATCHWELCOME; - } - + m4ac->frame_length_short = get_bits1(gb); res_flags = get_bits(gb, 3); if (res_flags) { avpriv_report_missing_feature(avctx, @@ -1066,6 +1064,10 @@ static av_cold int aac_decode_init(AVCodecContext *avctx) ff_mdct_init(&ac->mdct_ld, 10, 1, 1.0 / (32768.0 * 512.0)); ff_mdct_init(&ac->mdct_small, 8, 1, 1.0 / (32768.0 * 128.0)); ff_mdct_init(&ac->mdct_ltp, 11, 0, -2.0 * 32768.0); + ret = ff_imdct15_init(&ac->mdct480, 5); + if (ret < 0) + return ret; + // window initialization ff_kbd_window_init(ff_aac_kbd_long_1024, 4.0, 1024); ff_kbd_window_init(ff_aac_kbd_short_128, 6.0, 128); @@ -1180,9 +1182,15 @@ static int decode_ics_info(AACContext *ac, IndividualChannelStream *ics, ics->max_sfb = get_bits(gb, 6); ics->num_windows = 1; if (aot == AOT_ER_AAC_LD || aot == AOT_ER_AAC_ELD) { - ics->swb_offset = ff_swb_offset_512[sampling_index]; - ics->num_swb = ff_aac_num_swb_512[sampling_index]; - ics->tns_max_bands = ff_tns_max_bands_512[sampling_index]; + if (m4ac->frame_length_short) { + ics->swb_offset = ff_swb_offset_480[sampling_index]; + ics->num_swb = ff_aac_num_swb_480[sampling_index]; + ics->tns_max_bands = ff_tns_max_bands_480[sampling_index]; + } else { + ics->swb_offset = ff_swb_offset_512[sampling_index]; + ics->num_swb = ff_aac_num_swb_512[sampling_index]; + ics->tns_max_bands = ff_tns_max_bands_512[sampling_index]; + } if (!ics->num_swb || !ics->swb_offset) return AVERROR_BUG; } else { @@ -2457,12 +2465,13 @@ static void imdct_and_windowing_eld(AACContext *ac, SingleChannelElement *sce) float *in = sce->coeffs; float *out = sce->ret; float *saved = sce->saved; - const float *const window = ff_aac_eld_window_512; float *buf = ac->buf_mdct; int i; - const int n = 512; + const int n = ac->oc[1].m4ac.frame_length_short ? 480 : 512; const int n2 = n >> 1; const int n4 = n >> 2; + const float *const window = n == 480 ? ff_aac_eld_window_480 : + ff_aac_eld_window_512; // Inverse transform, mapped to the conventional IMDCT by // Chivukula, R.K.; Reznik, Y.A.; Devarajan, V., @@ -2474,7 +2483,10 @@ static void imdct_and_windowing_eld(AACContext *ac, SingleChannelElement *sce) temp = in[i ]; in[i ] = -in[n - 1 - i]; in[n - 1 - i] = temp; temp = -in[i + 1]; in[i + 1] = in[n - 2 - i]; in[n - 2 - i] = temp; } - ac->mdct.imdct_half(&ac->mdct_ld, buf, in); + if (n == 480) + ac->mdct480->imdct_half(ac->mdct480, buf, in, 1, -1.f/(16*1024*960)); + else + ac->mdct.imdct_half(&ac->mdct_ld, buf, in); for (i = 0; i < n; i+=2) { buf[i] = -buf[i]; } @@ -2687,6 +2699,7 @@ static int parse_adts_frame_header(AACContext *ac, GetBitContext *gb) ac->oc[1].m4ac.sample_rate = hdr_info.sample_rate; ac->oc[1].m4ac.sampling_index = hdr_info.sampling_index; ac->oc[1].m4ac.object_type = hdr_info.object_type; + ac->oc[1].m4ac.frame_length_short = 0; if (ac->oc[0].status != OC_LOCKED || ac->oc[0].m4ac.chan_config != hdr_info.chan_config || ac->oc[0].m4ac.sample_rate != hdr_info.sample_rate) { @@ -2706,7 +2719,7 @@ static int aac_decode_er_frame(AVCodecContext *avctx, void *data, const MPEG4AudioConfig *const m4ac = &ac->oc[1].m4ac; ChannelElement *che; int err, i; - int samples = 1024; + int samples = m4ac->frame_length_short ? 960 : 1024; int chan_config = m4ac->chan_config; int aot = m4ac->object_type; @@ -2982,6 +2995,7 @@ static av_cold int aac_decode_close(AVCodecContext *avctx) ff_mdct_end(&ac->mdct_small); ff_mdct_end(&ac->mdct_ld); ff_mdct_end(&ac->mdct_ltp); + ff_imdct15_uninit(&ac->mdct480); return 0; } -- cgit v1.2.3