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Diffstat (limited to 'ffmpeg/libavcodec/wmalosslessdec.c')
-rw-r--r--ffmpeg/libavcodec/wmalosslessdec.c1321
1 files changed, 0 insertions, 1321 deletions
diff --git a/ffmpeg/libavcodec/wmalosslessdec.c b/ffmpeg/libavcodec/wmalosslessdec.c
deleted file mode 100644
index 71d8aa3..0000000
--- a/ffmpeg/libavcodec/wmalosslessdec.c
+++ /dev/null
@@ -1,1321 +0,0 @@
-/*
- * Windows Media Audio Lossless decoder
- * Copyright (c) 2007 Baptiste Coudurier, Benjamin Larsson, Ulion
- * Copyright (c) 2008 - 2011 Sascha Sommer, Benjamin Larsson
- * Copyright (c) 2011 Andreas Öman
- * Copyright (c) 2011 - 2012 Mashiat Sarker Shakkhar
- *
- * This file is part of FFmpeg.
- *
- * FFmpeg is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2.1 of the License, or (at your option) any later version.
- *
- * FFmpeg is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with FFmpeg; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
- */
-
-#include "libavutil/attributes.h"
-#include "libavutil/avassert.h"
-
-#include "avcodec.h"
-#include "internal.h"
-#include "get_bits.h"
-#include "put_bits.h"
-#include "wma.h"
-#include "wma_common.h"
-
-/** current decoder limitations */
-#define WMALL_MAX_CHANNELS 8 ///< max number of handled channels
-#define MAX_SUBFRAMES 32 ///< max number of subframes per channel
-#define MAX_BANDS 29 ///< max number of scale factor bands
-#define MAX_FRAMESIZE 32768 ///< maximum compressed frame size
-#define MAX_ORDER 256
-
-#define WMALL_BLOCK_MIN_BITS 6 ///< log2 of min block size
-#define WMALL_BLOCK_MAX_BITS 14 ///< log2 of max block size
-#define WMALL_BLOCK_MAX_SIZE (1 << WMALL_BLOCK_MAX_BITS) ///< maximum block size
-#define WMALL_BLOCK_SIZES (WMALL_BLOCK_MAX_BITS - WMALL_BLOCK_MIN_BITS + 1) ///< possible block sizes
-
-
-/**
- * @brief frame-specific decoder context for a single channel
- */
-typedef struct {
- int16_t prev_block_len; ///< length of the previous block
- uint8_t transmit_coefs;
- uint8_t num_subframes;
- uint16_t subframe_len[MAX_SUBFRAMES]; ///< subframe length in samples
- uint16_t subframe_offsets[MAX_SUBFRAMES]; ///< subframe positions in the current frame
- uint8_t cur_subframe; ///< current subframe number
- uint16_t decoded_samples; ///< number of already processed samples
- int quant_step; ///< quantization step for the current subframe
- int transient_counter; ///< number of transient samples from the beginning of the transient zone
-} WmallChannelCtx;
-
-/**
- * @brief main decoder context
- */
-typedef struct WmallDecodeCtx {
- /* generic decoder variables */
- AVCodecContext *avctx;
- AVFrame *frame;
- uint8_t frame_data[MAX_FRAMESIZE + FF_INPUT_BUFFER_PADDING_SIZE]; ///< compressed frame data
- PutBitContext pb; ///< context for filling the frame_data buffer
-
- /* frame size dependent frame information (set during initialization) */
- uint32_t decode_flags; ///< used compression features
- int len_prefix; ///< frame is prefixed with its length
- int dynamic_range_compression; ///< frame contains DRC data
- uint8_t bits_per_sample; ///< integer audio sample size for the unscaled IMDCT output (used to scale to [-1.0, 1.0])
- uint16_t samples_per_frame; ///< number of samples to output
- uint16_t log2_frame_size;
- int8_t num_channels; ///< number of channels in the stream (same as AVCodecContext.num_channels)
- int8_t lfe_channel; ///< lfe channel index
- uint8_t max_num_subframes;
- uint8_t subframe_len_bits; ///< number of bits used for the subframe length
- uint8_t max_subframe_len_bit; ///< flag indicating that the subframe is of maximum size when the first subframe length bit is 1
- uint16_t min_samples_per_subframe;
-
- /* packet decode state */
- GetBitContext pgb; ///< bitstream reader context for the packet
- int next_packet_start; ///< start offset of the next WMA packet in the demuxer packet
- uint8_t packet_offset; ///< offset to the frame in the packet
- uint8_t packet_sequence_number; ///< current packet number
- int num_saved_bits; ///< saved number of bits
- int frame_offset; ///< frame offset in the bit reservoir
- int subframe_offset; ///< subframe offset in the bit reservoir
- uint8_t packet_loss; ///< set in case of bitstream error
- uint8_t packet_done; ///< set when a packet is fully decoded
-
- /* frame decode state */
- uint32_t frame_num; ///< current frame number (not used for decoding)
- GetBitContext gb; ///< bitstream reader context
- int buf_bit_size; ///< buffer size in bits
- int16_t *samples_16[WMALL_MAX_CHANNELS]; ///< current samplebuffer pointer (16-bit)
- int32_t *samples_32[WMALL_MAX_CHANNELS]; ///< current samplebuffer pointer (24-bit)
- uint8_t drc_gain; ///< gain for the DRC tool
- int8_t skip_frame; ///< skip output step
- int8_t parsed_all_subframes; ///< all subframes decoded?
-
- /* subframe/block decode state */
- int16_t subframe_len; ///< current subframe length
- int8_t channels_for_cur_subframe; ///< number of channels that contain the subframe
- int8_t channel_indexes_for_cur_subframe[WMALL_MAX_CHANNELS];
-
- WmallChannelCtx channel[WMALL_MAX_CHANNELS]; ///< per channel data
-
- // WMA Lossless-specific
-
- uint8_t do_arith_coding;
- uint8_t do_ac_filter;
- uint8_t do_inter_ch_decorr;
- uint8_t do_mclms;
- uint8_t do_lpc;
-
- int8_t acfilter_order;
- int8_t acfilter_scaling;
- int64_t acfilter_coeffs[16];
- int acfilter_prevvalues[WMALL_MAX_CHANNELS][16];
-
- int8_t mclms_order;
- int8_t mclms_scaling;
- int16_t mclms_coeffs[128];
- int16_t mclms_coeffs_cur[4];
- int16_t mclms_prevvalues[WMALL_MAX_CHANNELS * 2 * 32];
- int16_t mclms_updates[WMALL_MAX_CHANNELS * 2 * 32];
- int mclms_recent;
-
- int movave_scaling;
- int quant_stepsize;
-
- struct {
- int order;
- int scaling;
- int coefsend;
- int bitsend;
- int16_t coefs[MAX_ORDER];
- int16_t lms_prevvalues[MAX_ORDER * 2];
- int16_t lms_updates[MAX_ORDER * 2];
- int recent;
- } cdlms[WMALL_MAX_CHANNELS][9];
-
- int cdlms_ttl[WMALL_MAX_CHANNELS];
-
- int bV3RTM;
-
- int is_channel_coded[WMALL_MAX_CHANNELS];
- int update_speed[WMALL_MAX_CHANNELS];
-
- int transient[WMALL_MAX_CHANNELS];
- int transient_pos[WMALL_MAX_CHANNELS];
- int seekable_tile;
-
- int ave_sum[WMALL_MAX_CHANNELS];
-
- int channel_residues[WMALL_MAX_CHANNELS][WMALL_BLOCK_MAX_SIZE];
-
- int lpc_coefs[WMALL_MAX_CHANNELS][40];
- int lpc_order;
- int lpc_scaling;
- int lpc_intbits;
-
- int channel_coeffs[WMALL_MAX_CHANNELS][WMALL_BLOCK_MAX_SIZE];
-} WmallDecodeCtx;
-
-
-static av_cold int decode_init(AVCodecContext *avctx)
-{
- WmallDecodeCtx *s = avctx->priv_data;
- uint8_t *edata_ptr = avctx->extradata;
- unsigned int channel_mask;
- int i, log2_max_num_subframes;
-
- if (!avctx->block_align) {
- av_log(avctx, AV_LOG_ERROR, "block_align is not set\n");
- return AVERROR(EINVAL);
- }
-
- s->avctx = avctx;
- init_put_bits(&s->pb, s->frame_data, MAX_FRAMESIZE);
-
- if (avctx->extradata_size >= 18) {
- s->decode_flags = AV_RL16(edata_ptr + 14);
- channel_mask = AV_RL32(edata_ptr + 2);
- s->bits_per_sample = AV_RL16(edata_ptr);
- if (s->bits_per_sample == 16)
- avctx->sample_fmt = AV_SAMPLE_FMT_S16P;
- else if (s->bits_per_sample == 24) {
- avctx->sample_fmt = AV_SAMPLE_FMT_S32P;
- avpriv_report_missing_feature(avctx, "Bit-depth higher than 16");
- return AVERROR_PATCHWELCOME;
- } else {
- av_log(avctx, AV_LOG_ERROR, "Unknown bit-depth: %d\n",
- s->bits_per_sample);
- return AVERROR_INVALIDDATA;
- }
- /* dump the extradata */
- for (i = 0; i < avctx->extradata_size; i++)
- av_dlog(avctx, "[%x] ", avctx->extradata[i]);
- av_dlog(avctx, "\n");
-
- } else {
- avpriv_request_sample(avctx, "Unsupported extradata size");
- return AVERROR_PATCHWELCOME;
- }
-
- /* generic init */
- s->log2_frame_size = av_log2(avctx->block_align) + 4;
-
- /* frame info */
- s->skip_frame = 1; /* skip first frame */
- s->packet_loss = 1;
- s->len_prefix = s->decode_flags & 0x40;
-
- /* get frame len */
- s->samples_per_frame = 1 << ff_wma_get_frame_len_bits(avctx->sample_rate,
- 3, s->decode_flags);
- av_assert0(s->samples_per_frame <= WMALL_BLOCK_MAX_SIZE);
-
- /* init previous block len */
- for (i = 0; i < avctx->channels; i++)
- s->channel[i].prev_block_len = s->samples_per_frame;
-
- /* subframe info */
- log2_max_num_subframes = (s->decode_flags & 0x38) >> 3;
- s->max_num_subframes = 1 << log2_max_num_subframes;
- s->max_subframe_len_bit = 0;
- s->subframe_len_bits = av_log2(log2_max_num_subframes) + 1;
-
- s->min_samples_per_subframe = s->samples_per_frame / s->max_num_subframes;
- s->dynamic_range_compression = s->decode_flags & 0x80;
- s->bV3RTM = s->decode_flags & 0x100;
-
- if (s->max_num_subframes > MAX_SUBFRAMES) {
- av_log(avctx, AV_LOG_ERROR, "invalid number of subframes %i\n",
- s->max_num_subframes);
- return AVERROR_INVALIDDATA;
- }
-
- s->num_channels = avctx->channels;
-
- /* extract lfe channel position */
- s->lfe_channel = -1;
-
- if (channel_mask & 8) {
- unsigned int mask;
- for (mask = 1; mask < 16; mask <<= 1)
- if (channel_mask & mask)
- ++s->lfe_channel;
- }
-
- if (s->num_channels < 0) {
- av_log(avctx, AV_LOG_ERROR, "invalid number of channels %d\n",
- s->num_channels);
- return AVERROR_INVALIDDATA;
- } else if (s->num_channels > WMALL_MAX_CHANNELS) {
- avpriv_request_sample(avctx,
- "More than %d channels", WMALL_MAX_CHANNELS);
- return AVERROR_PATCHWELCOME;
- }
-
- s->frame = av_frame_alloc();
- if (!s->frame)
- return AVERROR(ENOMEM);
-
- avctx->channel_layout = channel_mask;
- return 0;
-}
-
-/**
- * @brief Decode the subframe length.
- * @param s context
- * @param offset sample offset in the frame
- * @return decoded subframe length on success, < 0 in case of an error
- */
-static int decode_subframe_length(WmallDecodeCtx *s, int offset)
-{
- int frame_len_ratio, subframe_len, len;
-
- /* no need to read from the bitstream when only one length is possible */
- if (offset == s->samples_per_frame - s->min_samples_per_subframe)
- return s->min_samples_per_subframe;
-
- len = av_log2(s->max_num_subframes - 1) + 1;
- frame_len_ratio = get_bits(&s->gb, len);
- subframe_len = s->min_samples_per_subframe * (frame_len_ratio + 1);
-
- /* sanity check the length */
- if (subframe_len < s->min_samples_per_subframe ||
- subframe_len > s->samples_per_frame) {
- av_log(s->avctx, AV_LOG_ERROR, "broken frame: subframe_len %i\n",
- subframe_len);
- return AVERROR_INVALIDDATA;
- }
- return subframe_len;
-}
-
-/**
- * @brief Decode how the data in the frame is split into subframes.
- * Every WMA frame contains the encoded data for a fixed number of
- * samples per channel. The data for every channel might be split
- * into several subframes. This function will reconstruct the list of
- * subframes for every channel.
- *
- * If the subframes are not evenly split, the algorithm estimates the
- * channels with the lowest number of total samples.
- * Afterwards, for each of these channels a bit is read from the
- * bitstream that indicates if the channel contains a subframe with the
- * next subframe size that is going to be read from the bitstream or not.
- * If a channel contains such a subframe, the subframe size gets added to
- * the channel's subframe list.
- * The algorithm repeats these steps until the frame is properly divided
- * between the individual channels.
- *
- * @param s context
- * @return 0 on success, < 0 in case of an error
- */
-static int decode_tilehdr(WmallDecodeCtx *s)
-{
- uint16_t num_samples[WMALL_MAX_CHANNELS] = { 0 }; /* sum of samples for all currently known subframes of a channel */
- uint8_t contains_subframe[WMALL_MAX_CHANNELS]; /* flag indicating if a channel contains the current subframe */
- int channels_for_cur_subframe = s->num_channels; /* number of channels that contain the current subframe */
- int fixed_channel_layout = 0; /* flag indicating that all channels use the same subfra2me offsets and sizes */
- int min_channel_len = 0; /* smallest sum of samples (channels with this length will be processed first) */
- int c, tile_aligned;
-
- /* reset tiling information */
- for (c = 0; c < s->num_channels; c++)
- s->channel[c].num_subframes = 0;
-
- tile_aligned = get_bits1(&s->gb);
- if (s->max_num_subframes == 1 || tile_aligned)
- fixed_channel_layout = 1;
-
- /* loop until the frame data is split between the subframes */
- do {
- int subframe_len, in_use = 0;
-
- /* check which channels contain the subframe */
- for (c = 0; c < s->num_channels; c++) {
- if (num_samples[c] == min_channel_len) {
- if (fixed_channel_layout || channels_for_cur_subframe == 1 ||
- (min_channel_len == s->samples_per_frame - s->min_samples_per_subframe)) {
- contains_subframe[c] = 1;
- } else {
- contains_subframe[c] = get_bits1(&s->gb);
- }
- in_use |= contains_subframe[c];
- } else
- contains_subframe[c] = 0;
- }
-
- if (!in_use) {
- av_log(s->avctx, AV_LOG_ERROR,
- "Found empty subframe\n");
- return AVERROR_INVALIDDATA;
- }
-
- /* get subframe length, subframe_len == 0 is not allowed */
- if ((subframe_len = decode_subframe_length(s, min_channel_len)) <= 0)
- return AVERROR_INVALIDDATA;
- /* add subframes to the individual channels and find new min_channel_len */
- min_channel_len += subframe_len;
- for (c = 0; c < s->num_channels; c++) {
- WmallChannelCtx *chan = &s->channel[c];
-
- if (contains_subframe[c]) {
- if (chan->num_subframes >= MAX_SUBFRAMES) {
- av_log(s->avctx, AV_LOG_ERROR,
- "broken frame: num subframes > 31\n");
- return AVERROR_INVALIDDATA;
- }
- chan->subframe_len[chan->num_subframes] = subframe_len;
- num_samples[c] += subframe_len;
- ++chan->num_subframes;
- if (num_samples[c] > s->samples_per_frame) {
- av_log(s->avctx, AV_LOG_ERROR, "broken frame: "
- "channel len(%d) > samples_per_frame(%d)\n",
- num_samples[c], s->samples_per_frame);
- return AVERROR_INVALIDDATA;
- }
- } else if (num_samples[c] <= min_channel_len) {
- if (num_samples[c] < min_channel_len) {
- channels_for_cur_subframe = 0;
- min_channel_len = num_samples[c];
- }
- ++channels_for_cur_subframe;
- }
- }
- } while (min_channel_len < s->samples_per_frame);
-
- for (c = 0; c < s->num_channels; c++) {
- int i, offset = 0;
- for (i = 0; i < s->channel[c].num_subframes; i++) {
- s->channel[c].subframe_offsets[i] = offset;
- offset += s->channel[c].subframe_len[i];
- }
- }
-
- return 0;
-}
-
-static void decode_ac_filter(WmallDecodeCtx *s)
-{
- int i;
- s->acfilter_order = get_bits(&s->gb, 4) + 1;
- s->acfilter_scaling = get_bits(&s->gb, 4);
-
- for (i = 0; i < s->acfilter_order; i++)
- s->acfilter_coeffs[i] = (s->acfilter_scaling ?
- get_bits(&s->gb, s->acfilter_scaling) : 0) + 1;
-}
-
-static void decode_mclms(WmallDecodeCtx *s)
-{
- s->mclms_order = (get_bits(&s->gb, 4) + 1) * 2;
- s->mclms_scaling = get_bits(&s->gb, 4);
- if (get_bits1(&s->gb)) {
- int i, send_coef_bits;
- int cbits = av_log2(s->mclms_scaling + 1);
- if (1 << cbits < s->mclms_scaling + 1)
- cbits++;
-
- send_coef_bits = (cbits ? get_bits(&s->gb, cbits) : 0) + 2;
-
- for (i = 0; i < s->mclms_order * s->num_channels * s->num_channels; i++)
- s->mclms_coeffs[i] = get_bits(&s->gb, send_coef_bits);
-
- for (i = 0; i < s->num_channels; i++) {
- int c;
- for (c = 0; c < i; c++)
- s->mclms_coeffs_cur[i * s->num_channels + c] = get_bits(&s->gb, send_coef_bits);
- }
- }
-}
-
-static int decode_cdlms(WmallDecodeCtx *s)
-{
- int c, i;
- int cdlms_send_coef = get_bits1(&s->gb);
-
- for (c = 0; c < s->num_channels; c++) {
- s->cdlms_ttl[c] = get_bits(&s->gb, 3) + 1;
- for (i = 0; i < s->cdlms_ttl[c]; i++) {
- s->cdlms[c][i].order = (get_bits(&s->gb, 7) + 1) * 8;
- if (s->cdlms[c][i].order > MAX_ORDER) {
- av_log(s->avctx, AV_LOG_ERROR,
- "Order[%d][%d] %d > max (%d), not supported\n",
- c, i, s->cdlms[c][i].order, MAX_ORDER);
- s->cdlms[0][0].order = 0;
- return AVERROR_INVALIDDATA;
- }
- }
-
- for (i = 0; i < s->cdlms_ttl[c]; i++)
- s->cdlms[c][i].scaling = get_bits(&s->gb, 4);
-
- if (cdlms_send_coef) {
- for (i = 0; i < s->cdlms_ttl[c]; i++) {
- int cbits, shift_l, shift_r, j;
- cbits = av_log2(s->cdlms[c][i].order);
- if ((1 << cbits) < s->cdlms[c][i].order)
- cbits++;
- s->cdlms[c][i].coefsend = get_bits(&s->gb, cbits) + 1;
-
- cbits = av_log2(s->cdlms[c][i].scaling + 1);
- if ((1 << cbits) < s->cdlms[c][i].scaling + 1)
- cbits++;
-
- s->cdlms[c][i].bitsend = get_bits(&s->gb, cbits) + 2;
- shift_l = 32 - s->cdlms[c][i].bitsend;
- shift_r = 32 - s->cdlms[c][i].scaling - 2;
- for (j = 0; j < s->cdlms[c][i].coefsend; j++)
- s->cdlms[c][i].coefs[j] =
- (get_bits(&s->gb, s->cdlms[c][i].bitsend) << shift_l) >> shift_r;
- }
- }
- }
-
- return 0;
-}
-
-static int decode_channel_residues(WmallDecodeCtx *s, int ch, int tile_size)
-{
- int i = 0;
- unsigned int ave_mean;
- s->transient[ch] = get_bits1(&s->gb);
- if (s->transient[ch]) {
- s->transient_pos[ch] = get_bits(&s->gb, av_log2(tile_size));
- if (s->transient_pos[ch])
- s->transient[ch] = 0;
- s->channel[ch].transient_counter =
- FFMAX(s->channel[ch].transient_counter, s->samples_per_frame / 2);
- } else if (s->channel[ch].transient_counter)
- s->transient[ch] = 1;
-
- if (s->seekable_tile) {
- ave_mean = get_bits(&s->gb, s->bits_per_sample);
- s->ave_sum[ch] = ave_mean << (s->movave_scaling + 1);
- }
-
- if (s->seekable_tile) {
- if (s->do_inter_ch_decorr)
- s->channel_residues[ch][0] = get_sbits_long(&s->gb, s->bits_per_sample + 1);
- else
- s->channel_residues[ch][0] = get_sbits_long(&s->gb, s->bits_per_sample);
- i++;
- }
- for (; i < tile_size; i++) {
- int quo = 0, rem, rem_bits, residue;
- while(get_bits1(&s->gb)) {
- quo++;
- if (get_bits_left(&s->gb) <= 0)
- return -1;
- }
- if (quo >= 32)
- quo += get_bits_long(&s->gb, get_bits(&s->gb, 5) + 1);
-
- ave_mean = (s->ave_sum[ch] + (1 << s->movave_scaling)) >> (s->movave_scaling + 1);
- if (ave_mean <= 1)
- residue = quo;
- else {
- rem_bits = av_ceil_log2(ave_mean);
- rem = get_bits_long(&s->gb, rem_bits);
- residue = (quo << rem_bits) + rem;
- }
-
- s->ave_sum[ch] = residue + s->ave_sum[ch] -
- (s->ave_sum[ch] >> s->movave_scaling);
-
- if (residue & 1)
- residue = -(residue >> 1) - 1;
- else
- residue = residue >> 1;
- s->channel_residues[ch][i] = residue;
- }
-
- return 0;
-
-}
-
-static void decode_lpc(WmallDecodeCtx *s)
-{
- int ch, i, cbits;
- s->lpc_order = get_bits(&s->gb, 5) + 1;
- s->lpc_scaling = get_bits(&s->gb, 4);
- s->lpc_intbits = get_bits(&s->gb, 3) + 1;
- cbits = s->lpc_scaling + s->lpc_intbits;
- for (ch = 0; ch < s->num_channels; ch++)
- for (i = 0; i < s->lpc_order; i++)
- s->lpc_coefs[ch][i] = get_sbits(&s->gb, cbits);
-}
-
-static void clear_codec_buffers(WmallDecodeCtx *s)
-{
- int ich, ilms;
-
- memset(s->acfilter_coeffs, 0, sizeof(s->acfilter_coeffs));
- memset(s->acfilter_prevvalues, 0, sizeof(s->acfilter_prevvalues));
- memset(s->lpc_coefs, 0, sizeof(s->lpc_coefs));
-
- memset(s->mclms_coeffs, 0, sizeof(s->mclms_coeffs));
- memset(s->mclms_coeffs_cur, 0, sizeof(s->mclms_coeffs_cur));
- memset(s->mclms_prevvalues, 0, sizeof(s->mclms_prevvalues));
- memset(s->mclms_updates, 0, sizeof(s->mclms_updates));
-
- for (ich = 0; ich < s->num_channels; ich++) {
- for (ilms = 0; ilms < s->cdlms_ttl[ich]; ilms++) {
- memset(s->cdlms[ich][ilms].coefs, 0,
- sizeof(s->cdlms[ich][ilms].coefs));
- memset(s->cdlms[ich][ilms].lms_prevvalues, 0,
- sizeof(s->cdlms[ich][ilms].lms_prevvalues));
- memset(s->cdlms[ich][ilms].lms_updates, 0,
- sizeof(s->cdlms[ich][ilms].lms_updates));
- }
- s->ave_sum[ich] = 0;
- }
-}
-
-/**
- * @brief Reset filter parameters and transient area at new seekable tile.
- */
-static void reset_codec(WmallDecodeCtx *s)
-{
- int ich, ilms;
- s->mclms_recent = s->mclms_order * s->num_channels;
- for (ich = 0; ich < s->num_channels; ich++) {
- for (ilms = 0; ilms < s->cdlms_ttl[ich]; ilms++)
- s->cdlms[ich][ilms].recent = s->cdlms[ich][ilms].order;
- /* first sample of a seekable subframe is considered as the starting of
- a transient area which is samples_per_frame samples long */
- s->channel[ich].transient_counter = s->samples_per_frame;
- s->transient[ich] = 1;
- s->transient_pos[ich] = 0;
- }
-}
-
-static void mclms_update(WmallDecodeCtx *s, int icoef, int *pred)
-{
- int i, j, ich, pred_error;
- int order = s->mclms_order;
- int num_channels = s->num_channels;
- int range = 1 << (s->bits_per_sample - 1);
-
- for (ich = 0; ich < num_channels; ich++) {
- pred_error = s->channel_residues[ich][icoef] - pred[ich];
- if (pred_error > 0) {
- for (i = 0; i < order * num_channels; i++)
- s->mclms_coeffs[i + ich * order * num_channels] +=
- s->mclms_updates[s->mclms_recent + i];
- for (j = 0; j < ich; j++) {
- if (s->channel_residues[j][icoef] > 0)
- s->mclms_coeffs_cur[ich * num_channels + j] += 1;
- else if (s->channel_residues[j][icoef] < 0)
- s->mclms_coeffs_cur[ich * num_channels + j] -= 1;
- }
- } else if (pred_error < 0) {
- for (i = 0; i < order * num_channels; i++)
- s->mclms_coeffs[i + ich * order * num_channels] -=
- s->mclms_updates[s->mclms_recent + i];
- for (j = 0; j < ich; j++) {
- if (s->channel_residues[j][icoef] > 0)
- s->mclms_coeffs_cur[ich * num_channels + j] -= 1;
- else if (s->channel_residues[j][icoef] < 0)
- s->mclms_coeffs_cur[ich * num_channels + j] += 1;
- }
- }
- }
-
- for (ich = num_channels - 1; ich >= 0; ich--) {
- s->mclms_recent--;
- s->mclms_prevvalues[s->mclms_recent] = s->channel_residues[ich][icoef];
- if (s->channel_residues[ich][icoef] > range - 1)
- s->mclms_prevvalues[s->mclms_recent] = range - 1;
- else if (s->channel_residues[ich][icoef] < -range)
- s->mclms_prevvalues[s->mclms_recent] = -range;
-
- s->mclms_updates[s->mclms_recent] = 0;
- if (s->channel_residues[ich][icoef] > 0)
- s->mclms_updates[s->mclms_recent] = 1;
- else if (s->channel_residues[ich][icoef] < 0)
- s->mclms_updates[s->mclms_recent] = -1;
- }
-
- if (s->mclms_recent == 0) {
- memcpy(&s->mclms_prevvalues[order * num_channels],
- s->mclms_prevvalues,
- 2 * order * num_channels);
- memcpy(&s->mclms_updates[order * num_channels],
- s->mclms_updates,
- 2 * order * num_channels);
- s->mclms_recent = num_channels * order;
- }
-}
-
-static void mclms_predict(WmallDecodeCtx *s, int icoef, int *pred)
-{
- int ich, i;
- int order = s->mclms_order;
- int num_channels = s->num_channels;
-
- for (ich = 0; ich < num_channels; ich++) {
- pred[ich] = 0;
- if (!s->is_channel_coded[ich])
- continue;
- for (i = 0; i < order * num_channels; i++)
- pred[ich] += s->mclms_prevvalues[i + s->mclms_recent] *
- s->mclms_coeffs[i + order * num_channels * ich];
- for (i = 0; i < ich; i++)
- pred[ich] += s->channel_residues[i][icoef] *
- s->mclms_coeffs_cur[i + num_channels * ich];
- pred[ich] += 1 << s->mclms_scaling - 1;
- pred[ich] >>= s->mclms_scaling;
- s->channel_residues[ich][icoef] += pred[ich];
- }
-}
-
-static void revert_mclms(WmallDecodeCtx *s, int tile_size)
-{
- int icoef, pred[WMALL_MAX_CHANNELS] = { 0 };
- for (icoef = 0; icoef < tile_size; icoef++) {
- mclms_predict(s, icoef, pred);
- mclms_update(s, icoef, pred);
- }
-}
-
-static int lms_predict(WmallDecodeCtx *s, int ich, int ilms)
-{
- int pred = 0, icoef;
- int recent = s->cdlms[ich][ilms].recent;
-
- for (icoef = 0; icoef < s->cdlms[ich][ilms].order; icoef++)
- pred += s->cdlms[ich][ilms].coefs[icoef] *
- s->cdlms[ich][ilms].lms_prevvalues[icoef + recent];
-
- return pred;
-}
-
-static void lms_update(WmallDecodeCtx *s, int ich, int ilms,
- int input, int residue)
-{
- int icoef;
- int recent = s->cdlms[ich][ilms].recent;
- int range = 1 << s->bits_per_sample - 1;
-
- if (residue < 0) {
- for (icoef = 0; icoef < s->cdlms[ich][ilms].order; icoef++)
- s->cdlms[ich][ilms].coefs[icoef] -=
- s->cdlms[ich][ilms].lms_updates[icoef + recent];
- } else if (residue > 0) {
- for (icoef = 0; icoef < s->cdlms[ich][ilms].order; icoef++)
- s->cdlms[ich][ilms].coefs[icoef] +=
- s->cdlms[ich][ilms].lms_updates[icoef + recent];
- }
-
- if (recent)
- recent--;
- else {
- memcpy(&s->cdlms[ich][ilms].lms_prevvalues[s->cdlms[ich][ilms].order],
- s->cdlms[ich][ilms].lms_prevvalues,
- 2 * s->cdlms[ich][ilms].order);
- memcpy(&s->cdlms[ich][ilms].lms_updates[s->cdlms[ich][ilms].order],
- s->cdlms[ich][ilms].lms_updates,
- 2 * s->cdlms[ich][ilms].order);
- recent = s->cdlms[ich][ilms].order - 1;
- }
-
- s->cdlms[ich][ilms].lms_prevvalues[recent] = av_clip(input, -range, range - 1);
- if (!input)
- s->cdlms[ich][ilms].lms_updates[recent] = 0;
- else if (input < 0)
- s->cdlms[ich][ilms].lms_updates[recent] = -s->update_speed[ich];
- else
- s->cdlms[ich][ilms].lms_updates[recent] = s->update_speed[ich];
-
- s->cdlms[ich][ilms].lms_updates[recent + (s->cdlms[ich][ilms].order >> 4)] >>= 2;
- s->cdlms[ich][ilms].lms_updates[recent + (s->cdlms[ich][ilms].order >> 3)] >>= 1;
- s->cdlms[ich][ilms].recent = recent;
-}
-
-static void use_high_update_speed(WmallDecodeCtx *s, int ich)
-{
- int ilms, recent, icoef;
- for (ilms = s->cdlms_ttl[ich] - 1; ilms >= 0; ilms--) {
- recent = s->cdlms[ich][ilms].recent;
- if (s->update_speed[ich] == 16)
- continue;
- if (s->bV3RTM) {
- for (icoef = 0; icoef < s->cdlms[ich][ilms].order; icoef++)
- s->cdlms[ich][ilms].lms_updates[icoef + recent] *= 2;
- } else {
- for (icoef = 0; icoef < s->cdlms[ich][ilms].order; icoef++)
- s->cdlms[ich][ilms].lms_updates[icoef] *= 2;
- }
- }
- s->update_speed[ich] = 16;
-}
-
-static void use_normal_update_speed(WmallDecodeCtx *s, int ich)
-{
- int ilms, recent, icoef;
- for (ilms = s->cdlms_ttl[ich] - 1; ilms >= 0; ilms--) {
- recent = s->cdlms[ich][ilms].recent;
- if (s->update_speed[ich] == 8)
- continue;
- if (s->bV3RTM)
- for (icoef = 0; icoef < s->cdlms[ich][ilms].order; icoef++)
- s->cdlms[ich][ilms].lms_updates[icoef + recent] /= 2;
- else
- for (icoef = 0; icoef < s->cdlms[ich][ilms].order; icoef++)
- s->cdlms[ich][ilms].lms_updates[icoef] /= 2;
- }
- s->update_speed[ich] = 8;
-}
-
-static void revert_cdlms(WmallDecodeCtx *s, int ch,
- int coef_begin, int coef_end)
-{
- int icoef, pred, ilms, num_lms, residue, input;
-
- num_lms = s->cdlms_ttl[ch];
- for (ilms = num_lms - 1; ilms >= 0; ilms--) {
- for (icoef = coef_begin; icoef < coef_end; icoef++) {
- pred = 1 << (s->cdlms[ch][ilms].scaling - 1);
- residue = s->channel_residues[ch][icoef];
- pred += lms_predict(s, ch, ilms);
- input = residue + (pred >> s->cdlms[ch][ilms].scaling);
- lms_update(s, ch, ilms, input, residue);
- s->channel_residues[ch][icoef] = input;
- }
- }
-}
-
-static void revert_inter_ch_decorr(WmallDecodeCtx *s, int tile_size)
-{
- if (s->num_channels != 2)
- return;
- else if (s->is_channel_coded[0] || s->is_channel_coded[1]) {
- int icoef;
- for (icoef = 0; icoef < tile_size; icoef++) {
- s->channel_residues[0][icoef] -= s->channel_residues[1][icoef] >> 1;
- s->channel_residues[1][icoef] += s->channel_residues[0][icoef];
- }
- }
-}
-
-static void revert_acfilter(WmallDecodeCtx *s, int tile_size)
-{
- int ich, pred, i, j;
- int64_t *filter_coeffs = s->acfilter_coeffs;
- int scaling = s->acfilter_scaling;
- int order = s->acfilter_order;
-
- for (ich = 0; ich < s->num_channels; ich++) {
- int *prevvalues = s->acfilter_prevvalues[ich];
- for (i = 0; i < order; i++) {
- pred = 0;
- for (j = 0; j < order; j++) {
- if (i <= j)
- pred += filter_coeffs[j] * prevvalues[j - i];
- else
- pred += s->channel_residues[ich][i - j - 1] * filter_coeffs[j];
- }
- pred >>= scaling;
- s->channel_residues[ich][i] += pred;
- }
- for (i = order; i < tile_size; i++) {
- pred = 0;
- for (j = 0; j < order; j++)
- pred += s->channel_residues[ich][i - j - 1] * filter_coeffs[j];
- pred >>= scaling;
- s->channel_residues[ich][i] += pred;
- }
- for (j = 0; j < order; j++)
- prevvalues[j] = s->channel_residues[ich][tile_size - j - 1];
- }
-}
-
-static int decode_subframe(WmallDecodeCtx *s)
-{
- int offset = s->samples_per_frame;
- int subframe_len = s->samples_per_frame;
- int total_samples = s->samples_per_frame * s->num_channels;
- int i, j, rawpcm_tile, padding_zeroes, res;
-
- s->subframe_offset = get_bits_count(&s->gb);
-
- /* reset channel context and find the next block offset and size
- == the next block of the channel with the smallest number of
- decoded samples */
- for (i = 0; i < s->num_channels; i++) {
- if (offset > s->channel[i].decoded_samples) {
- offset = s->channel[i].decoded_samples;
- subframe_len =
- s->channel[i].subframe_len[s->channel[i].cur_subframe];
- }
- }
-
- /* get a list of all channels that contain the estimated block */
- s->channels_for_cur_subframe = 0;
- for (i = 0; i < s->num_channels; i++) {
- const int cur_subframe = s->channel[i].cur_subframe;
- /* subtract already processed samples */
- total_samples -= s->channel[i].decoded_samples;
-
- /* and count if there are multiple subframes that match our profile */
- if (offset == s->channel[i].decoded_samples &&
- subframe_len == s->channel[i].subframe_len[cur_subframe]) {
- total_samples -= s->channel[i].subframe_len[cur_subframe];
- s->channel[i].decoded_samples +=
- s->channel[i].subframe_len[cur_subframe];
- s->channel_indexes_for_cur_subframe[s->channels_for_cur_subframe] = i;
- ++s->channels_for_cur_subframe;
- }
- }
-
- /* check if the frame will be complete after processing the
- estimated block */
- if (!total_samples)
- s->parsed_all_subframes = 1;
-
-
- s->seekable_tile = get_bits1(&s->gb);
- if (s->seekable_tile) {
- clear_codec_buffers(s);
-
- s->do_arith_coding = get_bits1(&s->gb);
- if (s->do_arith_coding) {
- avpriv_request_sample(s->avctx, "Arithmetic coding");
- return AVERROR_PATCHWELCOME;
- }
- s->do_ac_filter = get_bits1(&s->gb);
- s->do_inter_ch_decorr = get_bits1(&s->gb);
- s->do_mclms = get_bits1(&s->gb);
-
- if (s->do_ac_filter)
- decode_ac_filter(s);
-
- if (s->do_mclms)
- decode_mclms(s);
-
- if ((res = decode_cdlms(s)) < 0)
- return res;
- s->movave_scaling = get_bits(&s->gb, 3);
- s->quant_stepsize = get_bits(&s->gb, 8) + 1;
-
- reset_codec(s);
- } else if (!s->cdlms[0][0].order) {
- av_log(s->avctx, AV_LOG_DEBUG,
- "Waiting for seekable tile\n");
- av_frame_unref(s->frame);
- return -1;
- }
-
- rawpcm_tile = get_bits1(&s->gb);
-
- for (i = 0; i < s->num_channels; i++)
- s->is_channel_coded[i] = 1;
-
- if (!rawpcm_tile) {
- for (i = 0; i < s->num_channels; i++)
- s->is_channel_coded[i] = get_bits1(&s->gb);
-
- if (s->bV3RTM) {
- // LPC
- s->do_lpc = get_bits1(&s->gb);
- if (s->do_lpc) {
- decode_lpc(s);
- avpriv_request_sample(s->avctx, "Expect wrong output since "
- "inverse LPC filter");
- }
- } else
- s->do_lpc = 0;
- }
-
-
- if (get_bits1(&s->gb))
- padding_zeroes = get_bits(&s->gb, 5);
- else
- padding_zeroes = 0;
-
- if (rawpcm_tile) {
- int bits = s->bits_per_sample - padding_zeroes;
- if (bits <= 0) {
- av_log(s->avctx, AV_LOG_ERROR,
- "Invalid number of padding bits in raw PCM tile\n");
- return AVERROR_INVALIDDATA;
- }
- av_dlog(s->avctx, "RAWPCM %d bits per sample. "
- "total %d bits, remain=%d\n", bits,
- bits * s->num_channels * subframe_len, get_bits_count(&s->gb));
- for (i = 0; i < s->num_channels; i++)
- for (j = 0; j < subframe_len; j++)
- s->channel_coeffs[i][j] = get_sbits_long(&s->gb, bits);
- } else {
- for (i = 0; i < s->num_channels; i++)
- if (s->is_channel_coded[i]) {
- decode_channel_residues(s, i, subframe_len);
- if (s->seekable_tile)
- use_high_update_speed(s, i);
- else
- use_normal_update_speed(s, i);
- revert_cdlms(s, i, 0, subframe_len);
- } else {
- memset(s->channel_residues[i], 0, sizeof(**s->channel_residues) * subframe_len);
- }
- }
- if (s->do_mclms)
- revert_mclms(s, subframe_len);
- if (s->do_inter_ch_decorr)
- revert_inter_ch_decorr(s, subframe_len);
- if (s->do_ac_filter)
- revert_acfilter(s, subframe_len);
-
- /* Dequantize */
- if (s->quant_stepsize != 1)
- for (i = 0; i < s->num_channels; i++)
- for (j = 0; j < subframe_len; j++)
- s->channel_residues[i][j] *= s->quant_stepsize;
-
- /* Write to proper output buffer depending on bit-depth */
- for (i = 0; i < s->channels_for_cur_subframe; i++) {
- int c = s->channel_indexes_for_cur_subframe[i];
- int subframe_len = s->channel[c].subframe_len[s->channel[c].cur_subframe];
-
- for (j = 0; j < subframe_len; j++) {
- if (s->bits_per_sample == 16) {
- *s->samples_16[c]++ = (int16_t) s->channel_residues[c][j] << padding_zeroes;
- } else {
- *s->samples_32[c]++ = s->channel_residues[c][j] << padding_zeroes;
- }
- }
- }
-
- /* handled one subframe */
- for (i = 0; i < s->channels_for_cur_subframe; i++) {
- int c = s->channel_indexes_for_cur_subframe[i];
- if (s->channel[c].cur_subframe >= s->channel[c].num_subframes) {
- av_log(s->avctx, AV_LOG_ERROR, "broken subframe\n");
- return AVERROR_INVALIDDATA;
- }
- ++s->channel[c].cur_subframe;
- }
- return 0;
-}
-
-/**
- * @brief Decode one WMA frame.
- * @param s codec context
- * @return 0 if the trailer bit indicates that this is the last frame,
- * 1 if there are additional frames
- */
-static int decode_frame(WmallDecodeCtx *s)
-{
- GetBitContext* gb = &s->gb;
- int more_frames = 0, len = 0, i, ret;
-
- s->frame->nb_samples = s->samples_per_frame;
- if ((ret = ff_get_buffer(s->avctx, s->frame, 0)) < 0) {
- /* return an error if no frame could be decoded at all */
- s->packet_loss = 1;
- return ret;
- }
- for (i = 0; i < s->num_channels; i++) {
- s->samples_16[i] = (int16_t *)s->frame->extended_data[i];
- s->samples_32[i] = (int32_t *)s->frame->extended_data[i];
- }
-
- /* get frame length */
- if (s->len_prefix)
- len = get_bits(gb, s->log2_frame_size);
-
- /* decode tile information */
- if (decode_tilehdr(s)) {
- s->packet_loss = 1;
- return 0;
- }
-
- /* read drc info */
- if (s->dynamic_range_compression)
- s->drc_gain = get_bits(gb, 8);
-
- /* no idea what these are for, might be the number of samples
- that need to be skipped at the beginning or end of a stream */
- if (get_bits1(gb)) {
- int av_unused skip;
-
- /* usually true for the first frame */
- if (get_bits1(gb)) {
- skip = get_bits(gb, av_log2(s->samples_per_frame * 2));
- av_dlog(s->avctx, "start skip: %i\n", skip);
- }
-
- /* sometimes true for the last frame */
- if (get_bits1(gb)) {
- skip = get_bits(gb, av_log2(s->samples_per_frame * 2));
- av_dlog(s->avctx, "end skip: %i\n", skip);
- }
-
- }
-
- /* reset subframe states */
- s->parsed_all_subframes = 0;
- for (i = 0; i < s->num_channels; i++) {
- s->channel[i].decoded_samples = 0;
- s->channel[i].cur_subframe = 0;
- }
-
- /* decode all subframes */
- while (!s->parsed_all_subframes) {
- if (decode_subframe(s) < 0) {
- s->packet_loss = 1;
- return 0;
- }
- }
-
- av_dlog(s->avctx, "Frame done\n");
-
- if (s->skip_frame)
- s->skip_frame = 0;
-
- if (s->len_prefix) {
- if (len != (get_bits_count(gb) - s->frame_offset) + 2) {
- /* FIXME: not sure if this is always an error */
- av_log(s->avctx, AV_LOG_ERROR,
- "frame[%i] would have to skip %i bits\n", s->frame_num,
- len - (get_bits_count(gb) - s->frame_offset) - 1);
- s->packet_loss = 1;
- return 0;
- }
-
- /* skip the rest of the frame data */
- skip_bits_long(gb, len - (get_bits_count(gb) - s->frame_offset) - 1);
- }
-
- /* decode trailer bit */
- more_frames = get_bits1(gb);
- ++s->frame_num;
- return more_frames;
-}
-
-/**
- * @brief Calculate remaining input buffer length.
- * @param s codec context
- * @param gb bitstream reader context
- * @return remaining size in bits
- */
-static int remaining_bits(WmallDecodeCtx *s, GetBitContext *gb)
-{
- return s->buf_bit_size - get_bits_count(gb);
-}
-
-/**
- * @brief Fill the bit reservoir with a (partial) frame.
- * @param s codec context
- * @param gb bitstream reader context
- * @param len length of the partial frame
- * @param append decides whether to reset the buffer or not
- */
-static void save_bits(WmallDecodeCtx *s, GetBitContext* gb, int len,
- int append)
-{
- int buflen;
- PutBitContext tmp;
-
- /* when the frame data does not need to be concatenated, the input buffer
- is reset and additional bits from the previous frame are copied
- and skipped later so that a fast byte copy is possible */
-
- if (!append) {
- s->frame_offset = get_bits_count(gb) & 7;
- s->num_saved_bits = s->frame_offset;
- init_put_bits(&s->pb, s->frame_data, MAX_FRAMESIZE);
- }
-
- buflen = (s->num_saved_bits + len + 8) >> 3;
-
- if (len <= 0 || buflen > MAX_FRAMESIZE) {
- avpriv_request_sample(s->avctx, "Too small input buffer");
- s->packet_loss = 1;
- return;
- }
-
- s->num_saved_bits += len;
- if (!append) {
- avpriv_copy_bits(&s->pb, gb->buffer + (get_bits_count(gb) >> 3),
- s->num_saved_bits);
- } else {
- int align = 8 - (get_bits_count(gb) & 7);
- align = FFMIN(align, len);
- put_bits(&s->pb, align, get_bits(gb, align));
- len -= align;
- avpriv_copy_bits(&s->pb, gb->buffer + (get_bits_count(gb) >> 3), len);
- }
- skip_bits_long(gb, len);
-
- tmp = s->pb;
- flush_put_bits(&tmp);
-
- init_get_bits(&s->gb, s->frame_data, s->num_saved_bits);
- skip_bits(&s->gb, s->frame_offset);
-}
-
-static int decode_packet(AVCodecContext *avctx, void *data, int *got_frame_ptr,
- AVPacket* avpkt)
-{
- WmallDecodeCtx *s = avctx->priv_data;
- GetBitContext* gb = &s->pgb;
- const uint8_t* buf = avpkt->data;
- int buf_size = avpkt->size;
- int num_bits_prev_frame, packet_sequence_number, spliced_packet;
-
- s->frame->nb_samples = 0;
-
- if (s->packet_done || s->packet_loss) {
- s->packet_done = 0;
-
- if (!buf_size)
- return 0;
- /* sanity check for the buffer length */
- if (buf_size < avctx->block_align) {
- av_log(avctx, AV_LOG_ERROR, "buf size %d invalid\n", buf_size);
- return AVERROR_INVALIDDATA;
- }
-
- s->next_packet_start = buf_size - avctx->block_align;
- buf_size = avctx->block_align;
- s->buf_bit_size = buf_size << 3;
-
- /* parse packet header */
- init_get_bits(gb, buf, s->buf_bit_size);
- packet_sequence_number = get_bits(gb, 4);
- skip_bits(gb, 1); // Skip seekable_frame_in_packet, currently ununused
- spliced_packet = get_bits1(gb);
- if (spliced_packet)
- avpriv_request_sample(avctx, "Bitstream splicing");
-
- /* get number of bits that need to be added to the previous frame */
- num_bits_prev_frame = get_bits(gb, s->log2_frame_size);
-
- /* check for packet loss */
- if (!s->packet_loss &&
- ((s->packet_sequence_number + 1) & 0xF) != packet_sequence_number) {
- s->packet_loss = 1;
- av_log(avctx, AV_LOG_ERROR, "Packet loss detected! seq %x vs %x\n",
- s->packet_sequence_number, packet_sequence_number);
- }
- s->packet_sequence_number = packet_sequence_number;
-
- if (num_bits_prev_frame > 0) {
- int remaining_packet_bits = s->buf_bit_size - get_bits_count(gb);
- if (num_bits_prev_frame >= remaining_packet_bits) {
- num_bits_prev_frame = remaining_packet_bits;
- s->packet_done = 1;
- }
-
- /* Append the previous frame data to the remaining data from the
- * previous packet to create a full frame. */
- save_bits(s, gb, num_bits_prev_frame, 1);
-
- /* decode the cross packet frame if it is valid */
- if (num_bits_prev_frame < remaining_packet_bits && !s->packet_loss)
- decode_frame(s);
- } else if (s->num_saved_bits - s->frame_offset) {
- av_dlog(avctx, "ignoring %x previously saved bits\n",
- s->num_saved_bits - s->frame_offset);
- }
-
- if (s->packet_loss) {
- /* Reset number of saved bits so that the decoder does not start
- * to decode incomplete frames in the s->len_prefix == 0 case. */
- s->num_saved_bits = 0;
- s->packet_loss = 0;
- init_put_bits(&s->pb, s->frame_data, MAX_FRAMESIZE);
- }
-
- } else {
- int frame_size;
-
- s->buf_bit_size = (avpkt->size - s->next_packet_start) << 3;
- init_get_bits(gb, avpkt->data, s->buf_bit_size);
- skip_bits(gb, s->packet_offset);
-
- if (s->len_prefix && remaining_bits(s, gb) > s->log2_frame_size &&
- (frame_size = show_bits(gb, s->log2_frame_size)) &&
- frame_size <= remaining_bits(s, gb)) {
- save_bits(s, gb, frame_size, 0);
- s->packet_done = !decode_frame(s);
- } else if (!s->len_prefix
- && s->num_saved_bits > get_bits_count(&s->gb)) {
- /* when the frames do not have a length prefix, we don't know the
- * compressed length of the individual frames however, we know what
- * part of a new packet belongs to the previous frame therefore we
- * save the incoming packet first, then we append the "previous
- * frame" data from the next packet so that we get a buffer that
- * only contains full frames */
- s->packet_done = !decode_frame(s);
- } else {
- s->packet_done = 1;
- }
- }
-
- if (s->packet_done && !s->packet_loss &&
- remaining_bits(s, gb) > 0) {
- /* save the rest of the data so that it can be decoded
- * with the next packet */
- save_bits(s, gb, remaining_bits(s, gb), 0);
- }
-
- *got_frame_ptr = s->frame->nb_samples > 0;
- av_frame_move_ref(data, s->frame);
-
- s->packet_offset = get_bits_count(gb) & 7;
-
- return (s->packet_loss) ? AVERROR_INVALIDDATA : get_bits_count(gb) >> 3;
-}
-
-static void flush(AVCodecContext *avctx)
-{
- WmallDecodeCtx *s = avctx->priv_data;
- s->packet_loss = 1;
- s->packet_done = 0;
- s->num_saved_bits = 0;
- s->frame_offset = 0;
- s->next_packet_start = 0;
- s->cdlms[0][0].order = 0;
- s->frame->nb_samples = 0;
- init_put_bits(&s->pb, s->frame_data, MAX_FRAMESIZE);
-}
-
-static av_cold int decode_close(AVCodecContext *avctx)
-{
- WmallDecodeCtx *s = avctx->priv_data;
-
- av_frame_free(&s->frame);
-
- return 0;
-}
-
-AVCodec ff_wmalossless_decoder = {
- .name = "wmalossless",
- .long_name = NULL_IF_CONFIG_SMALL("Windows Media Audio Lossless"),
- .type = AVMEDIA_TYPE_AUDIO,
- .id = AV_CODEC_ID_WMALOSSLESS,
- .priv_data_size = sizeof(WmallDecodeCtx),
- .init = decode_init,
- .close = decode_close,
- .decode = decode_packet,
- .flush = flush,
- .capabilities = CODEC_CAP_SUBFRAMES | CODEC_CAP_DR1 | CODEC_CAP_DELAY,
- .sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_S16P,
- AV_SAMPLE_FMT_S32P,
- AV_SAMPLE_FMT_NONE },
-};
generated by cgit v1.2.3 (git 2.39.1) at 2025-12-06 13:16:58 +0000