Its the same for all FM stations and channels so we dont need more than
1
Signed-off-by: Michael Niedermayer <mich...@niedermayer.cc>
---
libavradio/rds.c | 11 +++++------
libavradio/sdr.h | 4 ++--
libavradio/sdrdemux.c | 33 +++++++++++++++++----------------
3 files changed, 24 insertions(+), 24 deletions(-)
diff --git a/libavradio/rds.c b/libavradio/rds.c
index e16685be18..1392bb0874 100644
--- a/libavradio/rds.c
+++ b/libavradio/rds.c
@@ -150,10 +150,9 @@ static int decode_rds_group(SDRContext *sdr, Station
*station, uint16_t group[4]
return 0;
}
-int ff_sdr_decode_rds(SDRContext *sdr, SDRStream *sst, AVComplexFloat *signal)
+int ff_sdr_decode_rds(SDRContext *sdr, Station *station, AVComplexFloat
*signal)
{
int i, phase;
- Station *station = sst->station;
float (*ring)[2] = station->rds_ring;
float diff[2*104 - 1];
uint16_t group[4];
@@ -164,10 +163,10 @@ int ff_sdr_decode_rds(SDRContext *sdr, SDRStream *sst,
AVComplexFloat *signal)
//For reasons that are beyond me, RDS spec allows inphase and quadrature
so we have to compute and check both
for (int i=0; i < sdr->fm_block_size_p2; i++) {
- ring[ station->rds_ring_pos + i ][0] +=
signal[i].re * sst->window_p2[i];
- ring[ station->rds_ring_pos + i + sdr->fm_block_size_p2 ][0] =
signal[i + sdr->fm_block_size_p2].re * sst->window_p2[i +
sdr->fm_block_size_p2];
- ring[ station->rds_ring_pos + i ][1] +=
signal[i].im * sst->window_p2[i];
- ring[ station->rds_ring_pos + i + sdr->fm_block_size_p2 ][1] =
signal[i + sdr->fm_block_size_p2].im * sst->window_p2[i +
sdr->fm_block_size_p2];
+ ring[ station->rds_ring_pos + i ][0] +=
signal[i].re * sdr->fm_window_p2[i];
+ ring[ station->rds_ring_pos + i + sdr->fm_block_size_p2 ][0] =
signal[i + sdr->fm_block_size_p2].re * sdr->fm_window_p2[i +
sdr->fm_block_size_p2];
+ ring[ station->rds_ring_pos + i ][1] +=
signal[i].im * sdr->fm_window_p2[i];
+ ring[ station->rds_ring_pos + i + sdr->fm_block_size_p2 ][1] =
signal[i + sdr->fm_block_size_p2].im * sdr->fm_window_p2[i +
sdr->fm_block_size_p2];
}
station->rds_ring_pos += sdr->fm_block_size_p2;
diff --git a/libavradio/sdr.h b/libavradio/sdr.h
index 7d951334f9..f966a16e2e 100644
--- a/libavradio/sdr.h
+++ b/libavradio/sdr.h
@@ -113,7 +113,6 @@ typedef struct SDRStream {
AVComplexFloat *icarrier;
AVComplexFloat *iside;
float *window;
- float *window_p2;
Station *station;
float am_amplitude;
@@ -163,6 +162,7 @@ typedef struct SDRContext {
int64_t fm_bandwidth_p2;
int fm_block_size_p2;
int rds_ring_size;
+ float *fm_window_p2;
int am_mode; ///< AMMode but using int for
generic option access
int emphasis_mode;
@@ -278,7 +278,7 @@ int ff_sdr_histogram_score(Station *s);
* Decode RDS
* @param signal the time domain RDS signal
*/
-int ff_sdr_decode_rds(SDRContext *sdr, SDRStream *sst, AVComplexFloat *signal);
+int ff_sdr_decode_rds(SDRContext *sdr, Station *station, AVComplexFloat
*signal);
static inline float len2(AVComplexFloat c)
{
diff --git a/libavradio/sdrdemux.c b/libavradio/sdrdemux.c
index 762328aebe..93e48c2cdf 100644
--- a/libavradio/sdrdemux.c
+++ b/libavradio/sdrdemux.c
@@ -1005,15 +1005,15 @@ static int demodulate_fm(SDRContext *sdr, int
stream_index, AVPacket *pkt)
memcpy(sst->block + i, sst->block + 3*carrier19_i,
sizeof(AVComplexFloat)*len2_4_i);
memcpy(sst->block + i + 2*sdr->fm_block_size_p2 - len2_4_i, sst->block
+ 3*carrier19_i - len2_4_i, sizeof(AVComplexFloat)*len2_4_i);
sst->ifft_p2(sst->ifft_p2_ctx, sst->iside , sst->block + i,
sizeof(AVComplexFloat));
- synchronous_am_demodulationN(sst->iside, sst->icarrier,
sst->window_p2, 2*sdr->fm_block_size_p2, 3);
- ff_sdr_decode_rds(sdr, sst, sst->iside);
+ synchronous_am_demodulationN(sst->iside, sst->icarrier,
sdr->fm_window_p2, 2*sdr->fm_block_size_p2, 3);
+ ff_sdr_decode_rds(sdr, sst->station, sst->iside);
memcpy(sst->block + i, sst->block + 2*carrier19_i,
sizeof(AVComplexFloat)*len17_i);
memcpy(sst->block + i + 2*sdr->fm_block_size_p2 - len17_i, sst->block
+ 2*carrier19_i - len17_i, sizeof(AVComplexFloat)*len17_i);
apply_deemphasis(sdr, sst->block + i, sdr->fm_block_size_p2,
sample_rate_p2, + 1);
apply_deemphasis(sdr, sst->block + i + 2*sdr->fm_block_size_p2,
sdr->fm_block_size_p2, sample_rate_p2, - 1);
sst->ifft_p2(sst->ifft_p2_ctx, sst->iside , sst->block + i,
sizeof(AVComplexFloat));
- synchronous_am_demodulationN(sst->iside, sst->icarrier,
sst->window_p2, 2*sdr->fm_block_size_p2, 2);
+ synchronous_am_demodulationN(sst->iside, sst->icarrier,
sdr->fm_window_p2, 2*sdr->fm_block_size_p2, 2);
}
memset(sst->block + len17_i, 0, (2*sdr->fm_block_size_p2 - len17_i) *
sizeof(AVComplexFloat));
apply_deemphasis(sdr, sst->block, 2*sdr->fm_block_size_p2, sample_rate_p2,
+ 1);
@@ -1024,12 +1024,12 @@ static int demodulate_fm(SDRContext *sdr, int
stream_index, AVPacket *pkt)
for(i = 0; i<sdr->fm_block_size_p2; i++) {
float m, q;
- m = sst->out_buf[2*i+0] + (sst->iblock[i ].re) *
sst->window_p2[i ] * scale;
- newbuf[2*i+0] = (sst->iblock[i + sdr->fm_block_size_p2].re)
* sst->window_p2[i + sdr->fm_block_size_p2] * scale;
+ m = sst->out_buf[2*i+0] + (sst->iblock[i ].re) *
sdr->fm_window_p2[i ] * scale;
+ newbuf[2*i+0] = (sst->iblock[i + sdr->fm_block_size_p2].re)
* sdr->fm_window_p2[i + sdr->fm_block_size_p2] * scale;
if (carrier19_i >= 0) {
- q = sst->out_buf[2*i+1] + sst->iside[i ].im *
sst->window_p2[i ] * scale;
- newbuf[2*i+1] = sst->iside[i +
sdr->fm_block_size_p2].im * sst->window_p2[i + sdr->fm_block_size_p2] * scale;
+ q = sst->out_buf[2*i+1] + sst->iside[i ].im *
sdr->fm_window_p2[i ] * scale;
+ newbuf[2*i+1] = sst->iside[i +
sdr->fm_block_size_p2].im * sdr->fm_window_p2[i + sdr->fm_block_size_p2] *
scale;
sst->out_buf[2*i+0] = m + q;
sst->out_buf[2*i+1] = m - q;
@@ -1108,7 +1108,6 @@ static void free_stream(SDRContext *sdr, int stream_index)
av_freep(&sst->icarrier);
av_freep(&sst->iside);
av_freep(&sst->window);
- av_freep(&sst->window_p2);
}
static int setup_stream(SDRContext *sdr, int stream_index, Station *station)
@@ -1152,15 +1151,9 @@ static int setup_stream(SDRContext *sdr, int
stream_index, Station *station)
if (ret < 0)
return ret;
- sst->window_p2 = av_malloc(sizeof(*sst->window_p2)* 2 *
sdr->fm_block_size_p2);
sst->iside = av_malloc(sizeof(*sst->iside) * 2 *
sdr->fm_block_size_p2);
- if (!sst->iside || !sst->window_p2)
+ if (!sst->iside)
return AVERROR(ENOMEM);
-
- avpriv_kbd_window_init(sst->window_p2, sdr->kbd_alpha,
sdr->fm_block_size_p2);
- for(int i = sdr->fm_block_size_p2; i < 2 * sdr->fm_block_size_p2;
i++) {
- sst->window_p2[i] = sst->window_p2[2*sdr->fm_block_size_p2 - i
- 1];
- }
}
sst->out_buf = av_mallocz(sizeof(*sst->out_buf) * 2 *
sst->block_size);
@@ -1508,7 +1501,9 @@ int ff_sdr_common_init(AVFormatContext *s)
sdr->block = av_malloc(sizeof(*sdr->block ) * 2 * sdr->block_size);
sdr->len2block = av_malloc(sizeof(*sdr->len2block) * 2 * sdr->block_size);
sdr->window = av_malloc(sizeof(*sdr->window ) * 2 * sdr->block_size);
- if (!sdr->windowed_block || !sdr->len2block || !sdr->block || !sdr->window)
+ sdr->fm_window_p2 = av_malloc(sizeof(*sdr->fm_window_p2)* 2 *
sdr->fm_block_size_p2);
+
+ if (!sdr->windowed_block || !sdr->len2block || !sdr->block || !sdr->window
|| !sdr->fm_window_p2)
return AVERROR(ENOMEM);
ret = av_tx_init(&sdr->fft_ctx, &sdr->fft, AV_TX_FLOAT_FFT, 0,
2*sdr->block_size, NULL, 0);
@@ -1523,6 +1518,11 @@ int ff_sdr_common_init(AVFormatContext *s)
for (int i = 0; i < 2 * sdr->block_size; i++)
sdr->window[i] *= ((i&1) ? 1:-1) * scale;
+ avpriv_kbd_window_init(sdr->fm_window_p2, sdr->kbd_alpha,
sdr->fm_block_size_p2);
+ for(int i = sdr->fm_block_size_p2; i < 2 * sdr->fm_block_size_p2; i++) {
+ sdr->fm_window_p2[i] = sdr->fm_window_p2[2*sdr->fm_block_size_p2 - i -
1];
+ }
+
if (sdr->waterfall_st_index >= 0) {
AVStream *st = s->streams[sdr->waterfall_st_index];
SDRStream *sst = st->priv_data;
@@ -1971,6 +1971,7 @@ int ff_sdr_read_close(AVFormatContext *s)
av_freep(&sdr->block);
av_freep(&sdr->len2block);
av_freep(&sdr->window);
+ av_freep(&sdr->fm_window_p2);
av_tx_uninit(&sdr->fft_ctx);
sdr->fft = NULL;
--
2.31.1
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