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ffmpeg.wasm-core
Commit 002097a0 authored by Justin Ruggles's avatar Justin Ruggles
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wmapro: use AVCodecContext.channels instead of keeping a private copy

parent 2ed40608
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Showing with 25 additions and 27 deletions
libavcodec/wmaprodec.c
View file @ 002097a0
......@@ -184,7 +184,6 @@ typedef struct WMAProDecodeCtx {
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
......@@ -246,7 +245,7 @@ static av_cold void dump_context(WMAProDecodeCtx *s)
PRINT("log2 frame size", s->log2_frame_size);
PRINT("max num subframes", s->max_num_subframes);
PRINT("len prefix", s->len_prefix);
PRINT("num channels", s->num_channels);
PRINT("num channels", s->avctx->channels);
}
/**
......@@ -337,18 +336,17 @@ static av_cold int decode_init(AVCodecContext *avctx)
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);
if (avctx->channels < 0) {
av_log(avctx, AV_LOG_ERROR, "invalid number of channels %d\n",
avctx->channels);
return AVERROR_INVALIDDATA;
} else if (s->num_channels > WMAPRO_MAX_CHANNELS) {
} else if (avctx->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++)
for (i = 0; i < avctx->channels; i++)
s->channel[i].prev_block_len = s->samples_per_frame;
/** extract lfe channel position */
......@@ -525,7 +523,7 @@ static int decode_tilehdr(WMAProDecodeCtx *s)
{
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 channels_for_cur_subframe = s->avctx->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;
......@@ -537,7 +535,7 @@ static int decode_tilehdr(WMAProDecodeCtx *s)
*/
/** reset tiling information */
for (c = 0; c < s->num_channels; c++)
for (c = 0; c < s->avctx->channels; c++)
s->channel[c].num_subframes = 0;
if (s->max_num_subframes == 1 || get_bits1(&s->gb))
......@@ -548,7 +546,7 @@ static int decode_tilehdr(WMAProDecodeCtx *s)
int subframe_len;
/** check which channels contain the subframe */
for (c = 0; c < s->num_channels; c++) {
for (c = 0; c < s->avctx->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))
......@@ -565,7 +563,7 @@ static int decode_tilehdr(WMAProDecodeCtx *s)
/** 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++) {
for (c = 0; c < s->avctx->channels; c++) {
WMAProChannelCtx* chan = &s->channel[c];
if (contains_subframe[c]) {
......@@ -592,7 +590,7 @@ static int decode_tilehdr(WMAProDecodeCtx *s)
}
} while (min_channel_len < s->samples_per_frame);
for (c = 0; c < s->num_channels; c++) {
for (c = 0; c < s->avctx->channels; c++) {
int i;
int offset = 0;
for (i = 0; i < s->channel[c].num_subframes; i++) {
......@@ -618,8 +616,8 @@ static void decode_decorrelation_matrix(WMAProDecodeCtx *s,
int i;
int offset = 0;
int8_t rotation_offset[WMAPRO_MAX_CHANNELS * WMAPRO_MAX_CHANNELS];
memset(chgroup->decorrelation_matrix, 0, s->num_channels *
s->num_channels * sizeof(*chgroup->decorrelation_matrix));
memset(chgroup->decorrelation_matrix, 0, s->avctx->channels *
s->avctx->channels * sizeof(*chgroup->decorrelation_matrix));
for (i = 0; i < chgroup->num_channels * (chgroup->num_channels - 1) >> 1; i++)
rotation_offset[i] = get_bits(&s->gb, 6);
......@@ -672,7 +670,7 @@ static int decode_channel_transform(WMAProDecodeCtx* s)
/** in the one channel case channel transforms are pointless */
s->num_chgroups = 0;
if (s->num_channels > 1) {
if (s->avctx->channels > 1) {
int remaining_channels = s->channels_for_cur_subframe;
if (get_bits1(&s->gb)) {
......@@ -718,7 +716,7 @@ static int decode_channel_transform(WMAProDecodeCtx* s)
}
} else {
chgroup->transform = 1;
if (s->num_channels == 2) {
if (s->avctx->channels == 2) {
chgroup->decorrelation_matrix[0] = 1.0;
chgroup->decorrelation_matrix[1] = -1.0;
chgroup->decorrelation_matrix[2] = 1.0;
......@@ -1008,7 +1006,7 @@ static void inverse_channel_transform(WMAProDecodeCtx *s)
(*ch)[y] = sum;
}
}
} else if (s->num_channels == 2) {
} else if (s->avctx->channels == 2) {
int len = FFMIN(sfb[1], s->subframe_len) - sfb[0];
s->dsp.vector_fmul_scalar(ch_data[0] + sfb[0],
ch_data[0] + sfb[0],
......@@ -1061,7 +1059,7 @@ static int decode_subframe(WMAProDecodeCtx *s)
int offset = s->samples_per_frame;
int subframe_len = s->samples_per_frame;
int i;
int total_samples = s->samples_per_frame * s->num_channels;
int total_samples = s->samples_per_frame * s->avctx->channels;
int transmit_coeffs = 0;
int cur_subwoofer_cutoff;
......@@ -1071,7 +1069,7 @@ static int decode_subframe(WMAProDecodeCtx *s)
== the next block of the channel with the smallest number of
decoded samples
*/
for (i = 0; i < s->num_channels; i++) {
for (i = 0; i < s->avctx->channels; i++) {
s->channel[i].grouped = 0;
if (offset > s->channel[i].decoded_samples) {
offset = s->channel[i].decoded_samples;
......@@ -1085,7 +1083,7 @@ static int decode_subframe(WMAProDecodeCtx *s)
/** 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++) {
for (i = 0; i < s->avctx->channels; i++) {
const int cur_subframe = s->channel[i].cur_subframe;
/** substract already processed samples */
total_samples -= s->channel[i].decoded_samples;
......@@ -1314,9 +1312,9 @@ static int decode_frame(WMAProDecodeCtx *s, int *got_frame_ptr)
}
/** read postproc transform */
if (s->num_channels > 1 && get_bits1(gb)) {
if (s->avctx->channels > 1 && get_bits1(gb)) {
if (get_bits1(gb)) {
for (i = 0; i < s->num_channels * s->num_channels; i++)
for (i = 0; i < avctx->channels * avctx->channels; i++)
skip_bits(gb, 4);
}
}
......@@ -1351,7 +1349,7 @@ static int decode_frame(WMAProDecodeCtx *s, int *got_frame_ptr)
/** reset subframe states */
s->parsed_all_subframes = 0;
for (i = 0; i < s->num_channels; i++) {
for (i = 0; i < avctx->channels; i++) {
s->channel[i].decoded_samples = 0;
s->channel[i].cur_subframe = 0;
s->channel[i].reuse_sf = 0;
......@@ -1374,11 +1372,11 @@ static int decode_frame(WMAProDecodeCtx *s, int *got_frame_ptr)
}
/** copy samples to the output buffer */
for (i = 0; i < s->num_channels; i++)
for (i = 0; i < avctx->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++) {
for (i = 0; i < avctx->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],
......@@ -1608,7 +1606,7 @@ static void flush(AVCodecContext *avctx)
int i;
/** reset output buffer as a part of it is used during the windowing of a
new frame */
for (i = 0; i < s->num_channels; i++)
for (i = 0; i < avctx->channels; i++)
memset(s->channel[i].out, 0, s->samples_per_frame *
sizeof(*s->channel[i].out));
s->packet_loss = 1;
......
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