/*
* Wmapro compatible decoder
* Copyright (c) 2007 Baptiste Coudurier, Benjamin Larsson, Ulion
- * Copyright (c) 2008 - 2009 Sascha Sommer, Benjamin Larsson
+ * Copyright (c) 2008 - 2011 Sascha Sommer, Benjamin Larsson
*
- * This file is part of FFmpeg.
+ * This file is part of Libav.
*
- * FFmpeg is free software; you can redistribute it and/or
+ * Libav 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,
+ * Libav 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
+ * License along with Libav; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/**
- * @file libavcodec/wmaprodec.c
+ * @file
* @brief wmapro decoder implementation
* Wmapro is an MDCT based codec comparable to wma standard or AAC.
* The decoding therefore consists of the following steps:
* subframe in order to reconstruct the output samples.
*/
+#include "libavutil/intfloat.h"
+#include "libavutil/intreadwrite.h"
#include "avcodec.h"
#include "internal.h"
#include "get_bits.h"
#include "put_bits.h"
#include "wmaprodata.h"
#include "dsputil.h"
+#include "sinewin.h"
#include "wma.h"
+#include "wma_common.h"
/** current decoder limitations */
#define WMAPRO_MAX_CHANNELS 8 ///< max number of handled channels
#define MAX_BANDS 29 ///< max number of scale factor bands
#define MAX_FRAMESIZE 32768 ///< maximum compressed frame size
-#define WMAPRO_BLOCK_MAX_BITS 12 ///< log2 of max block size
+#define WMAPRO_BLOCK_MIN_BITS 6 ///< log2 of min block size
+#define WMAPRO_BLOCK_MAX_BITS 13 ///< log2 of max block size
#define WMAPRO_BLOCK_MAX_SIZE (1 << WMAPRO_BLOCK_MAX_BITS) ///< maximum block size
-#define WMAPRO_BLOCK_SIZES (WMAPRO_BLOCK_MAX_BITS - BLOCK_MIN_BITS + 1) ///< possible block sizes
+#define WMAPRO_BLOCK_SIZES (WMAPRO_BLOCK_MAX_BITS - WMAPRO_BLOCK_MIN_BITS + 1) ///< possible block sizes
#define VLCBITS 9
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
float* coeffs; ///< pointer to the subframe decode buffer
- DECLARE_ALIGNED_16(float, out[WMAPRO_BLOCK_MAX_SIZE + WMAPRO_BLOCK_MAX_SIZE / 2]); ///< output buffer
+ uint16_t num_vec_coeffs; ///< number of vector coded coefficients
+ DECLARE_ALIGNED(32, float, out)[WMAPRO_BLOCK_MAX_SIZE + WMAPRO_BLOCK_MAX_SIZE / 2]; ///< output buffer
} WMAProChannelCtx;
/**
typedef struct WMAProDecodeCtx {
/* generic decoder variables */
AVCodecContext* avctx; ///< codec context for av_log
+ AVFrame frame; ///< AVFrame for decoded output
DSPContext dsp; ///< accelerated DSP functions
uint8_t frame_data[MAX_FRAMESIZE +
FF_INPUT_BUFFER_PADDING_SIZE];///< compressed frame data
PutBitContext pb; ///< context for filling the frame_data buffer
FFTContext mdct_ctx[WMAPRO_BLOCK_SIZES]; ///< MDCT context per block size
- DECLARE_ALIGNED_16(float, tmp[WMAPRO_BLOCK_MAX_SIZE]); ///< IMDCT output buffer
+ DECLARE_ALIGNED(32, float, tmp)[WMAPRO_BLOCK_MAX_SIZE]; ///< IMDCT output buffer
float* windows[WMAPRO_BLOCK_SIZES]; ///< windows for the different block sizes
/* frame size dependent frame information (set during initialization) */
/* 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; ///< frame offset in the packet
uint8_t packet_sequence_number; ///< current packet number
int num_saved_bits; ///< saved number of bits
uint32_t frame_num; ///< current frame number (not used for decoding)
GetBitContext gb; ///< bitstream reader context
int buf_bit_size; ///< buffer size in bits
- float* samples; ///< current samplebuffer pointer
- float* samples_end; ///< maximum samplebuffer pointer
uint8_t drc_gain; ///< gain for the DRC tool
int8_t skip_frame; ///< skip output step
int8_t parsed_all_subframes; ///< all subframes decoded?
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
*@brief helper function to print the most important members of the context
*@param s context
*/
-static void av_cold dump_context(WMAProDecodeCtx *s)
+static av_cold void dump_context(WMAProDecodeCtx *s)
{
#define PRINT(a, b) av_log(s->avctx, AV_LOG_DEBUG, " %s = %d\n", a, b);
#define PRINT_HEX(a, b) av_log(s->avctx, AV_LOG_DEBUG, " %s = %x\n", a, b);
WMAProDecodeCtx *s = avctx->priv_data;
uint8_t *edata_ptr = avctx->extradata;
unsigned int channel_mask;
- int i;
+ int i, bits;
int log2_max_num_subframes;
int num_possible_block_sizes;
s->avctx = avctx;
- dsputil_init(&s->dsp, avctx);
+ ff_dsputil_init(&s->dsp, avctx);
init_put_bits(&s->pb, s->frame_data, MAX_FRAMESIZE);
- avctx->sample_fmt = SAMPLE_FMT_FLT;
+ avctx->sample_fmt = AV_SAMPLE_FMT_FLTP;
if (avctx->extradata_size >= 18) {
s->decode_flags = AV_RL16(edata_ptr+14);
s->bits_per_sample = AV_RL16(edata_ptr);
/** dump the extradata */
for (i = 0; i < avctx->extradata_size; i++)
- dprintf(avctx, "[%x] ", avctx->extradata[i]);
- dprintf(avctx, "\n");
+ av_dlog(avctx, "[%x] ", avctx->extradata[i]);
+ av_dlog(avctx, "\n");
} else {
av_log_ask_for_sample(avctx, "Unknown extradata size\n");
s->log2_frame_size = av_log2(avctx->block_align) + 4;
/** frame info */
- s->skip_frame = 1; /** skip first frame */
+ s->skip_frame = 1; /* skip first frame */
s->packet_loss = 1;
s->len_prefix = (s->decode_flags & 0x40);
- if (!s->len_prefix) {
- av_log_ask_for_sample(avctx, "no length prefix\n");
- return AVERROR_INVALIDDATA;
- }
-
/** get frame len */
- s->samples_per_frame = 1 << ff_wma_get_frame_len_bits(avctx->sample_rate,
- 3, s->decode_flags);
-
- /** init previous block len */
- for (i = 0; i < avctx->channels; i++)
- s->channel[i].prev_block_len = s->samples_per_frame;
+ bits = ff_wma_get_frame_len_bits(avctx->sample_rate, 3, s->decode_flags);
+ if (bits > WMAPRO_BLOCK_MAX_BITS) {
+ av_log_missing_feature(avctx, "14-bits block sizes", 1);
+ return AVERROR_PATCHWELCOME;
+ }
+ s->samples_per_frame = 1 << bits;
/** subframe info */
log2_max_num_subframes = ((s->decode_flags & 0x38) >> 3);
s->max_num_subframes = 1 << log2_max_num_subframes;
- if (s->max_num_subframes == 16)
+ if (s->max_num_subframes == 16 || s->max_num_subframes == 4)
s->max_subframe_len_bit = 1;
s->subframe_len_bits = av_log2(log2_max_num_subframes) + 1;
return AVERROR_INVALIDDATA;
}
+ if (s->avctx->sample_rate <= 0) {
+ av_log(avctx, AV_LOG_ERROR, "invalid sample rate\n");
+ return AVERROR_INVALIDDATA;
+ }
+
s->num_channels = avctx->channels;
+ 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 > WMAPRO_MAX_CHANNELS) {
+ av_log_ask_for_sample(avctx, "unsupported number of channels\n");
+ return AVERROR_PATCHWELCOME;
+ }
+
+ /** init previous block len */
+ for (i = 0; i < s->num_channels; i++)
+ s->channel[i].prev_block_len = s->samples_per_frame;
+
/** extract lfe channel position */
s->lfe_channel = -1;
}
}
- if (s->num_channels < 0 || s->num_channels > WMAPRO_MAX_CHANNELS) {
- av_log_ask_for_sample(avctx, "invalid number of channels\n");
- return AVERROR_NOTSUPP;
- }
-
INIT_VLC_STATIC(&sf_vlc, SCALEVLCBITS, HUFF_SCALE_SIZE,
scale_huffbits, 1, 1,
scale_huffcodes, 2, 2, 616);
/** init MDCT, FIXME: only init needed sizes */
for (i = 0; i < WMAPRO_BLOCK_SIZES; i++)
- ff_mdct_init(&s->mdct_ctx[i], BLOCK_MIN_BITS+1+i, 1,
- 1.0 / (1 << (BLOCK_MIN_BITS + i - 1))
+ ff_mdct_init(&s->mdct_ctx[i], WMAPRO_BLOCK_MIN_BITS+1+i, 1,
+ 1.0 / (1 << (WMAPRO_BLOCK_MIN_BITS + i - 1))
/ (1 << (s->bits_per_sample - 1)));
/** init MDCT windows: simple sinus window */
for (i = 0; i < WMAPRO_BLOCK_SIZES; i++) {
- const int n = 1 << (WMAPRO_BLOCK_MAX_BITS - i);
const int win_idx = WMAPRO_BLOCK_MAX_BITS - i;
- ff_sine_window_init(ff_sine_windows[win_idx], n);
+ ff_init_ff_sine_windows(win_idx);
s->windows[WMAPRO_BLOCK_SIZES - i - 1] = ff_sine_windows[win_idx];
}
dump_context(s);
avctx->channel_layout = channel_mask;
+
+ avcodec_get_frame_defaults(&s->frame);
+ avctx->coded_frame = &s->frame;
+
return 0;
}
*/
static int decode_tilehdr(WMAProDecodeCtx *s)
{
- uint16_t num_samples[WMAPRO_MAX_CHANNELS]; /** sum of samples for all currently known subframes of a channel */
- uint8_t contains_subframe[WMAPRO_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 subframe offsets and sizes */
- int min_channel_len = 0; /** smallest sum of samples (channels with this length will be processed first) */
+ uint16_t num_samples[WMAPRO_MAX_CHANNELS] = { 0 };/**< sum of samples for all currently known subframes of a channel */
+ uint8_t contains_subframe[WMAPRO_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 subframe offsets and sizes */
+ int min_channel_len = 0; /**< smallest sum of samples (channels with this length will be processed first) */
int c;
/* Should never consume more than 3073 bits (256 iterations for the
for (c = 0; c < s->num_channels; c++)
s->channel[c].num_subframes = 0;
- memset(num_samples, 0, sizeof(num_samples));
-
if (s->max_num_subframes == 1 || get_bits1(&s->gb))
fixed_channel_layout = 1;
int i;
int offset = 0;
for (i = 0; i < s->channel[c].num_subframes; i++) {
- dprintf(s->avctx, "frame[%i] channel[%i] subframe[%i]"
+ av_dlog(s->avctx, "frame[%i] channel[%i] subframe[%i]"
" len %i\n", s->frame_num, c, i,
s->channel[c].subframe_len[i]);
s->channel[c].subframe_offset[i] = offset;
/* Integers 0..15 as single-precision floats. The table saves a
costly int to float conversion, and storing the values as
integers allows fast sign-flipping. */
- static const int fval_tab[16] = {
+ static const uint32_t fval_tab[16] = {
0x00000000, 0x3f800000, 0x40000000, 0x40400000,
0x40800000, 0x40a00000, 0x40c00000, 0x40e00000,
0x41000000, 0x41100000, 0x41200000, 0x41300000,
const uint16_t* run;
const float* level;
- dprintf(s->avctx, "decode coefficients for channel %i\n", c);
+ av_dlog(s->avctx, "decode coefficients for channel %i\n", c);
vlctable = get_bits1(&s->gb);
vlc = &coef_vlc[vlctable];
/** 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) {
- int vals[4];
+ while ((s->transmit_num_vec_coeffs || !rl_mode) &&
+ (cur_coeff + 3 < ci->num_vec_coeffs)) {
+ uint32_t vals[4];
int i;
unsigned int idx;
for (i = 0; i < 4; i += 2) {
idx = get_vlc2(&s->gb, vec2_vlc.table, VLCBITS, VEC2MAXDEPTH);
if (idx == HUFF_VEC2_SIZE - 1) {
- int v0, v1;
+ uint32_t v0, v1;
v0 = get_vlc2(&s->gb, vec1_vlc.table, VLCBITS, VEC1MAXDEPTH);
if (v0 == HUFF_VEC1_SIZE - 1)
v0 += ff_wma_get_large_val(&s->gb);
v1 = get_vlc2(&s->gb, vec1_vlc.table, VLCBITS, VEC1MAXDEPTH);
if (v1 == HUFF_VEC1_SIZE - 1)
v1 += ff_wma_get_large_val(&s->gb);
- ((float*)vals)[i ] = v0;
- ((float*)vals)[i+1] = v1;
+ vals[i ] = av_float2int(v0);
+ vals[i+1] = av_float2int(v1);
} else {
vals[i] = fval_tab[symbol_to_vec2[idx] >> 4 ];
vals[i+1] = fval_tab[symbol_to_vec2[idx] & 0xF];
/** decode sign */
for (i = 0; i < 4; i++) {
if (vals[i]) {
- int sign = get_bits1(&s->gb) - 1;
- *(uint32_t*)&ci->coeffs[cur_coeff] = vals[i] ^ sign<<31;
+ uint32_t sign = get_bits1(&s->gb) - 1;
+ AV_WN32A(&ci->coeffs[cur_coeff], vals[i] ^ sign << 31);
num_zeros = 0;
} else {
ci->coeffs[cur_coeff] = 0;
}
/** 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));
if (ff_wma_run_level_decode(s->avctx, &s->gb, vlc,
winlen = s->subframe_len;
}
- window = s->windows[av_log2(winlen) - BLOCK_MIN_BITS];
+ window = s->windows[av_log2(winlen) - WMAPRO_BLOCK_MIN_BITS];
winlen >>= 1;
s->dsp.vector_fmul_window(start, start, start + winlen,
- window, 0, winlen);
+ window, winlen);
s->channel[c].prev_block_len = s->subframe_len;
}
}
}
- dprintf(s->avctx,
+ av_dlog(s->avctx,
"processing subframe with offset %i len %i\n", offset, subframe_len);
/** get a list of all channels that contain the estimated block */
s->parsed_all_subframes = 1;
- dprintf(s->avctx, "subframe is part of %i channels\n",
+ av_dlog(s->avctx, "subframe is part of %i channels\n",
s->channels_for_cur_subframe);
/** calculate number of scale factor bands and their offsets */
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 */
- av_log_ask_for_sample(s->avctx, "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];
+ int num_vec_coeffs = get_bits(&s->gb, num_bits) << 2;
+ if (num_vec_coeffs > WMAPRO_BLOCK_MAX_SIZE) {
+ av_log(s->avctx, AV_LOG_ERROR, "num_vec_coeffs %d is too large\n", num_vec_coeffs);
+ return AVERROR_INVALIDDATA;
+ }
+ s->channel[c].num_vec_coeffs = num_vec_coeffs;
+ }
+ } 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);
return AVERROR_INVALIDDATA;
}
- dprintf(s->avctx, "BITSTREAM: subframe header length was %i\n",
+ av_dlog(s->avctx, "BITSTREAM: subframe header length was %i\n",
get_bits_count(&s->gb) - s->subframe_offset);
/** parse coefficients */
sizeof(*s->channel[c].coeffs) * subframe_len);
}
- dprintf(s->avctx, "BITSTREAM: subframe length was %i\n",
+ av_dlog(s->avctx, "BITSTREAM: subframe length was %i\n",
get_bits_count(&s->gb) - s->subframe_offset);
if (transmit_coeffs) {
+ FFTContext *mdct = &s->mdct_ctx[av_log2(subframe_len) - WMAPRO_BLOCK_MIN_BITS];
/** reconstruct the per channel data */
inverse_channel_transform(s);
for (i = 0; i < s->channels_for_cur_subframe; i++) {
quant, end - start);
}
- /** apply imdct (ff_imdct_half == DCTIV with reverse) */
- ff_imdct_half(&s->mdct_ctx[av_log2(subframe_len) - BLOCK_MIN_BITS],
- s->channel[c].coeffs, s->tmp);
+ /** apply imdct (imdct_half == DCTIV with reverse) */
+ mdct->imdct_half(mdct, s->channel[c].coeffs, s->tmp);
}
}
*@return 0 if the trailer bit indicates that this is the last frame,
* 1 if there are additional frames
*/
-static int decode_frame(WMAProDecodeCtx *s)
+static int decode_frame(WMAProDecodeCtx *s, int *got_frame_ptr)
{
+ AVCodecContext *avctx = s->avctx;
GetBitContext* gb = &s->gb;
int more_frames = 0;
int len = 0;
- int i;
-
- /** check for potential output buffer overflow */
- if (s->num_channels * s->samples_per_frame > s->samples_end - s->samples) {
- /** return an error if no frame could be decoded at all */
- av_log(s->avctx, AV_LOG_ERROR,
- "not enough space for the output samples\n");
- s->packet_loss = 1;
- return 0;
- }
+ int i, ret;
/** get frame length */
if (s->len_prefix)
len = get_bits(gb, s->log2_frame_size);
- dprintf(s->avctx, "decoding frame with length %x\n", len);
+ av_dlog(s->avctx, "decoding frame with length %x\n", len);
/** decode tile information */
if (decode_tilehdr(s)) {
/** read postproc transform */
if (s->num_channels > 1 && get_bits1(gb)) {
- av_log_ask_for_sample(s->avctx, "Unsupported postproc transform found\n");
- s->packet_loss = 1;
- return 0;
+ if (get_bits1(gb)) {
+ for (i = 0; i < s->num_channels * s->num_channels; i++)
+ skip_bits(gb, 4);
+ }
}
/** read drc info */
if (s->dynamic_range_compression) {
s->drc_gain = get_bits(gb, 8);
- dprintf(s->avctx, "drc_gain %i\n", s->drc_gain);
+ av_dlog(s->avctx, "drc_gain %i\n", s->drc_gain);
}
/** 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 skip;
+ 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));
- dprintf(s->avctx, "start skip: %i\n", skip);
+ 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));
- dprintf(s->avctx, "end skip: %i\n", skip);
+ av_dlog(s->avctx, "end skip: %i\n", skip);
}
}
- dprintf(s->avctx, "BITSTREAM: frame header length was %i\n",
+ av_dlog(s->avctx, "BITSTREAM: frame header length was %i\n",
get_bits_count(gb) - s->frame_offset);
/** reset subframe states */
}
}
- /** interleave samples and write them to the output buffer */
- for (i = 0; i < s->num_channels; i++) {
- float* ptr;
- int incr = s->num_channels;
- float* iptr = s->channel[i].out;
- int x;
-
- ptr = s->samples + i;
+ /* get output buffer */
+ s->frame.nb_samples = s->samples_per_frame;
+ if ((ret = avctx->get_buffer(avctx, &s->frame)) < 0) {
+ av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
+ s->packet_loss = 1;
+ return 0;
+ }
- for (x = 0; x < s->samples_per_frame; x++) {
- *ptr = av_clipf(*iptr++, -1.0, 32767.0 / 32768.0);
- ptr += incr;
- }
+ /** copy samples to the output buffer */
+ for (i = 0; i < s->num_channels; i++)
+ memcpy(s->frame.extended_data[i], s->channel[i].out,
+ s->samples_per_frame * sizeof(*s->channel[i].out));
+ for (i = 0; i < s->num_channels; i++) {
/** reuse second half of the IMDCT output for the next frame */
memcpy(&s->channel[i].out[0],
&s->channel[i].out[s->samples_per_frame],
if (s->skip_frame) {
s->skip_frame = 0;
- } else
- s->samples += s->num_channels * s->samples_per_frame;
-
- 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;
+ *got_frame_ptr = 0;
+ } else {
+ *got_frame_ptr = 1;
}
- /** skip the rest of the frame data */
- skip_bits_long(gb, len - (get_bits_count(gb) - s->frame_offset) - 1);
+ 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);
+ } else {
+ while (get_bits_count(gb) < s->num_saved_bits && get_bits1(gb) == 0) {
+ }
+ }
/** decode trailer bit */
more_frames = get_bits1(gb);
*@param s codec context
*@param gb bitstream reader context
*@param len length of the partial frame
- *@param append decides wether to reset the buffer or not
+ *@param append decides whether to reset the buffer or not
*/
static void save_bits(WMAProDecodeCtx *s, GetBitContext* gb, int len,
int append)
s->num_saved_bits += len;
if (!append) {
- ff_copy_bits(&s->pb, gb->buffer + (get_bits_count(gb) >> 3),
+ 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;
- ff_copy_bits(&s->pb, gb->buffer + (get_bits_count(gb) >> 3), len);
+ avpriv_copy_bits(&s->pb, gb->buffer + (get_bits_count(gb) >> 3), len);
}
skip_bits_long(gb, len);
*@brief Decode a single WMA packet.
*@param avctx codec context
*@param data the output buffer
- *@param data_size number of bytes that were written to the output buffer
*@param avpkt input packet
*@return number of bytes that were read from the input buffer
*/
-static int decode_packet(AVCodecContext *avctx,
- void *data, int *data_size, AVPacket* avpkt)
+static int decode_packet(AVCodecContext *avctx, void *data,
+ int *got_frame_ptr, AVPacket* avpkt)
{
WMAProDecodeCtx *s = avctx->priv_data;
GetBitContext* gb = &s->pgb;
int num_bits_prev_frame;
int packet_sequence_number;
- s->samples = data;
- s->samples_end = (float*)((int8_t*)data + *data_size);
- *data_size = 0;
+ *got_frame_ptr = 0;
if (s->packet_done || s->packet_loss) {
s->packet_done = 0;
- s->buf_bit_size = buf_size << 3;
/** sanity check for the buffer length */
if (buf_size < avctx->block_align)
return 0;
+ 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);
/** get number of bits that need to be added to the previous frame */
num_bits_prev_frame = get_bits(gb, s->log2_frame_size);
- dprintf(avctx, "packet[%d]: nbpf %x\n", avctx->frame_number,
+ av_dlog(avctx, "packet[%d]: nbpf %x\n", avctx->frame_number,
num_bits_prev_frame);
/** check for packet loss */
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);
- dprintf(avctx, "accumulated %x bits of frame data\n",
+ av_dlog(avctx, "accumulated %x bits of frame data\n",
s->num_saved_bits - s->frame_offset);
/** decode the cross packet frame if it is valid */
if (!s->packet_loss)
- decode_frame(s);
+ decode_frame(s, got_frame_ptr);
} else if (s->num_saved_bits - s->frame_offset) {
- dprintf(avctx, "ignoring %x previously saved bits\n",
+ av_dlog(avctx, "ignoring %x previously saved bits\n",
s->num_saved_bits - s->frame_offset);
}
- s->packet_loss = 0;
+ 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;
+ }
} else {
int frame_size;
- s->buf_bit_size = avpkt->size << 3;
+ 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 (remaining_bits(s, gb) > s->log2_frame_size &&
+ 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);
+ s->packet_done = !decode_frame(s, got_frame_ptr);
+ } 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, got_frame_ptr);
} else
s->packet_done = 1;
}
save_bits(s, gb, remaining_bits(s, gb), 0);
}
- *data_size = (int8_t *)s->samples - (int8_t *)data;
s->packet_offset = get_bits_count(gb) & 7;
+ if (s->packet_loss)
+ return AVERROR_INVALIDDATA;
+
+ if (*got_frame_ptr)
+ *(AVFrame *)data = s->frame;
- return (s->packet_loss) ? AVERROR_INVALIDDATA : get_bits_count(gb) >> 3;
+ return get_bits_count(gb) >> 3;
}
/**
/**
*@brief wmapro decoder
*/
-AVCodec wmapro_decoder = {
- "wmapro",
- CODEC_TYPE_AUDIO,
- CODEC_ID_WMAPRO,
- sizeof(WMAProDecodeCtx),
- decode_init,
- NULL,
- decode_end,
- decode_packet,
- .capabilities = CODEC_CAP_SUBFRAMES,
- .flush= flush,
- .long_name = NULL_IF_CONFIG_SMALL("Windows Media Audio 9 Professional"),
+AVCodec ff_wmapro_decoder = {
+ .name = "wmapro",
+ .type = AVMEDIA_TYPE_AUDIO,
+ .id = AV_CODEC_ID_WMAPRO,
+ .priv_data_size = sizeof(WMAProDecodeCtx),
+ .init = decode_init,
+ .close = decode_end,
+ .decode = decode_packet,
+ .capabilities = CODEC_CAP_SUBFRAMES | CODEC_CAP_DR1,
+ .flush = flush,
+ .long_name = NULL_IF_CONFIG_SMALL("Windows Media Audio 9 Professional"),
+ .sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_FLTP,
+ AV_SAMPLE_FMT_NONE },
};
projects / ffmpeg / blobdiff