diff options
author | Michael Giacomelli <giac2000@hotmail.com> | 2012-05-20 00:59:58 -0400 |
---|---|---|
committer | Michael Giacomelli <giac2000@hotmail.com> | 2012-05-20 01:05:47 -0400 |
commit | f8d54460f274d46412438fd74354e22fc4b28332 (patch) | |
tree | 2cb607d333062faf0dd721b9be9f1e208db5c4db | |
parent | f358228ea1bc66804e9ea12b65c2593c6c1fe8ee (diff) | |
download | rockbox-f8d5446.tar.gz rockbox-f8d5446.zip |
support decoding of files that contain the number of vector coded coefficients in their bitstream
No known samples are fixed by this problem, but I haven't tested many.
Backport of ffmpeg revision 26388.
Change-Id: Ife9654b7477a432834e3cab2cb43d16da071445a
-rwxr-xr-x[-rw-r--r--] | lib/rbcodec/codecs/libwmapro/wmaprodec.c | 24 |
1 files changed, 18 insertions, 6 deletions
diff --git a/lib/rbcodec/codecs/libwmapro/wmaprodec.c b/lib/rbcodec/codecs/libwmapro/wmaprodec.c index 9d42c6de0f..62a12738a5 100644..100755 --- a/lib/rbcodec/codecs/libwmapro/wmaprodec.c +++ b/lib/rbcodec/codecs/libwmapro/wmaprodec.c @@ -192,6 +192,7 @@ typedef struct { int* scale_factors; ///< pointer to the scale factor values used for decoding uint8_t table_idx; ///< index in sf_offsets for the scale factor reference block int32_t* coeffs; ///< pointer to the subframe decode buffer + uint16_t num_vec_coeffs; ///< number of vector coded coefficients int32_t* out; ///< output buffer } WMAProChannelCtx; @@ -260,6 +261,7 @@ typedef struct WMAProDecodeCtx { int8_t channels_for_cur_subframe; ///< number of channels that contain the subframe int8_t channel_indexes_for_cur_subframe[WMAPRO_MAX_CHANNELS]; int8_t num_bands; ///< number of scale factor bands + int8_t transmit_num_vec_coeffs; ///< number of vector coded coefficients is part of the bitstream int16_t* cur_sfb_offsets; ///< sfb offsets for the current block uint8_t table_idx; ///< index for the num_sfb, sfb_offsets, sf_offsets and subwoofer_cutoffs tables int8_t esc_len; ///< length of escaped coefficients @@ -845,7 +847,8 @@ static int decode_coeffs(WMAProDecodeCtx *s, int c) /** decode vector coefficients (consumes up to 167 bits per iteration for 4 vector coded large values) */ - while (!rl_mode && cur_coeff + 3 < s->subframe_len) { + while ((s->transmit_num_vec_coeffs || !rl_mode) && + (cur_coeff + 3 < ci->num_vec_coeffs)) { int32_t vals[4]; int i; unsigned int idx; @@ -902,7 +905,7 @@ static int decode_coeffs(WMAProDecodeCtx *s, int c) } /** decode run level coded coefficients */ - if (rl_mode) { + if (cur_coeff < s->subframe_len) { memset(&ci->coeffs[cur_coeff], 0, sizeof(*ci->coeffs) * (s->subframe_len - cur_coeff)); @@ -1210,10 +1213,19 @@ static int decode_subframe(WMAProDecodeCtx *s) if (transmit_coeffs) { int step; int quant_step = 90 * s->bits_per_sample >> 4; - if ((get_bits1(&s->gb))) { - /** FIXME: might change run level mode decision */ - DEBUGF("unsupported quant step coding\n"); - return AVERROR_INVALIDDATA; + + /** decode number of vector coded coefficients */ + if ((s->transmit_num_vec_coeffs = get_bits1(&s->gb))) { + int num_bits = av_log2((s->subframe_len + 3)/4) + 1; + for (i = 0; i < s->channels_for_cur_subframe; i++) { + int c = s->channel_indexes_for_cur_subframe[i]; + s->channel[c].num_vec_coeffs = get_bits(&s->gb, num_bits) << 2; + } + } else { + for (i = 0; i < s->channels_for_cur_subframe; i++) { + int c = s->channel_indexes_for_cur_subframe[i]; + s->channel[c].num_vec_coeffs = s->subframe_len; + } } /** decode quantization step */ step = get_sbits(&s->gb, 6); |