[FFmpeg-devel] [PATCH 2/2] lavf: add SBG demuxer.
Nicolas George
nicolas.george at normalesup.org
Wed Dec 7 15:44:28 CET 2011
Signed-off-by: Nicolas George <nicolas.george at normalesup.org>
---
Changelog | 1 +
doc/demuxers.texi | 30 +
doc/general.texi | 1 +
libavformat/Makefile | 1 +
libavformat/allformats.c | 1 +
libavformat/sbgdec.c | 1518 ++++++++++++++++++++++++++++++++++++++++++++++
libavformat/version.h | 2 +-
7 files changed, 1553 insertions(+), 1 deletions(-)
create mode 100644 libavformat/sbgdec.c
diff --git a/Changelog b/Changelog
index 6ab3e84..f559911 100644
--- a/Changelog
+++ b/Changelog
@@ -130,6 +130,7 @@ easier to use. The changes are:
- Microsoft Windows ICO demuxer
- life source
- PCM format support in OMA demuxer
+- SBaGen (SBG) binaural beats script demuxer
version 0.8:
diff --git a/doc/demuxers.texi b/doc/demuxers.texi
index 76d13b1..e98080a 100644
--- a/doc/demuxers.texi
+++ b/doc/demuxers.texi
@@ -75,4 +75,34 @@ the caller can decide which variant streams to actually receive.
The total bitrate of the variant that the stream belongs to is
available in a metadata key named "variant_bitrate".
+ at section sbg
+
+SBaGen script demuxer.
+
+This demuxer reads the script language used by SBaGen
+ at url{http://uazu.net/sbagen/} to generate binaural beats sessions. A SBG
+script looks like that:
+ at example
+-SE
+a: 300-2.5/3 440+4.5/0
+b: 300-2.5/0 440+4.5/3
+off: -
+NOW == a
++0:07:00 == b
++0:14:00 == a
++0:21:00 == b
++0:30:00 off
+ at end example
+
+A SBG script can mix absolute and relative timestamps. If the script uses
+either only absolute timestamps (including the script start time) or only
+relative ones, then its layout is fixed, and the conversion is
+straightforward. On the other hand, if the script mixes both kind of
+timestamps, then the @var{NOW} reference for relative timestamps will be
+taken from the current time of day at the time the script is read, and the
+script layout will be frozen according to that reference. That means that if
+the script is directly played, the actual times will match the absolute
+timestamps up to the sound controller's clock accuracy, but if the user
+somehow pauses the playback or seeks, all times will be shifted accordingly.
+
@c man end INPUT DEVICES
diff --git a/doc/general.texi b/doc/general.texi
index 1b720f5..b82ed5a 100644
--- a/doc/general.texi
+++ b/doc/general.texi
@@ -252,6 +252,7 @@ library:
@item RTP @tab X @tab X
@item RTSP @tab X @tab X
@item SAP @tab X @tab X
+ at item SBG @tab @tab X
@item SDP @tab @tab X
@item Sega FILM/CPK @tab @tab X
@tab Used in many Sega Saturn console games.
diff --git a/libavformat/Makefile b/libavformat/Makefile
index 4e3a183..8d5e726 100644
--- a/libavformat/Makefile
+++ b/libavformat/Makefile
@@ -280,6 +280,7 @@ OBJS-$(CONFIG_RTSP_MUXER) += rtsp.o rtspenc.o httpauth.o \
rtpenc_chain.o
OBJS-$(CONFIG_SAP_DEMUXER) += sapdec.o
OBJS-$(CONFIG_SAP_MUXER) += sapenc.o rtpenc_chain.o
+OBJS-$(CONFIG_SBG_DEMUXER) += sbgdec.o
OBJS-$(CONFIG_SDP_DEMUXER) += rtsp.o
OBJS-$(CONFIG_SEGAFILM_DEMUXER) += segafilm.o
OBJS-$(CONFIG_SEGMENT_MUXER) += segment.o
diff --git a/libavformat/allformats.c b/libavformat/allformats.c
index 9593bd5..c221405 100644
--- a/libavformat/allformats.c
+++ b/libavformat/allformats.c
@@ -201,6 +201,7 @@ void av_register_all(void)
REGISTER_MUXDEMUX (RTP, rtp);
REGISTER_MUXDEMUX (RTSP, rtsp);
REGISTER_MUXDEMUX (SAP, sap);
+ REGISTER_DEMUXER (SBG, sbg);
REGISTER_DEMUXER (SDP, sdp);
#if CONFIG_RTPDEC
av_register_rtp_dynamic_payload_handlers();
diff --git a/libavformat/sbgdec.c b/libavformat/sbgdec.c
new file mode 100644
index 0000000..2ec8702
--- /dev/null
+++ b/libavformat/sbgdec.c
@@ -0,0 +1,1518 @@
+/*
+ * SBG (SBaGen) file format decoder
+ * Copyright (c) 2011 Nicolas George
+ *
+ * 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 <stdio.h>
+#include <stdlib.h>
+#include <time.h>
+#include "libavutil/intreadwrite.h"
+#include "libavutil/log.h"
+#include "libavutil/opt.h"
+#include "avformat.h"
+#include "internal.h"
+
+#define SBG_SCALE (1 << 16)
+#define DAY (24 * 60 * 60)
+#define DAY_TS ((int64_t)DAY * AV_TIME_BASE)
+
+struct sbg_demuxer {
+ AVClass *class;
+ int sample_rate;
+ int frame_size;
+ int max_file_size;
+};
+
+struct sbg_string {
+ char *s;
+ char *e;
+};
+
+enum sbg_fade_type {
+ SBG_FADE_SILENCE = 0,
+ SBG_FADE_SAME = 1,
+ SBG_FADE_ADAPT = 3,
+};
+
+struct sbg_fade {
+ int8_t in, out, slide;
+};
+
+enum sbg_synth_type {
+ SBG_TYPE_NONE,
+ SBG_TYPE_SINE,
+ SBG_TYPE_NOISE,
+ SBG_TYPE_BELL,
+ SBG_TYPE_MIX,
+ SBG_TYPE_SPIN,
+};
+
+/* bell: freq constant, ampl decreases exponentially, can be approx lin */
+
+struct sbg_timestamp {
+ int64_t t;
+ char type; /* 0 for relative, 'N' for now, 'T' for absolute */
+};
+
+struct sbg_script_definition {
+ char *name;
+ int name_len;
+ int elements, nb_elements;
+ char type; /* 'S' or 'B' */
+};
+
+struct sbg_script_synth {
+ int carrier;
+ int beat;
+ int vol;
+ enum sbg_synth_type type;
+ struct {
+ int l, r;
+ } ref;
+};
+
+struct sbg_script_tseq {
+ struct sbg_timestamp ts;
+ char *name;
+ int name_len;
+ int lock;
+ struct sbg_fade fade;
+};
+
+struct sbg_script_event {
+ int64_t ts;
+ int64_t ts_int, ts_trans, ts_next;
+ int elements, nb_elements;
+ struct sbg_fade fade;
+};
+
+struct sbg_script {
+ struct sbg_script_definition *def;
+ struct sbg_script_synth *synth;
+ struct sbg_script_tseq *tseq;
+ struct sbg_script_tseq *block_tseq;
+ struct sbg_script_event *events;
+ int nb_def;
+ int nb_tseq;
+ int nb_events;
+ int nb_synth;
+ int64_t start_ts;
+ int64_t end_ts;
+ int64_t opt_fade_time;
+ int64_t opt_duration;
+ char *opt_mix;
+ int sample_rate;
+ uint8_t opt_start_at_first;
+ uint8_t opt_end_at_last;
+};
+
+struct sbg_parser {
+ void *log;
+ char *script, *end;
+ char *cursor;
+ struct sbg_script scs;
+ struct sbg_timestamp current_time;
+ int nb_block_tseq;
+ int nb_def_max, nb_synth_max, nb_tseq_max, nb_block_tseq_max;
+ int line_no;
+ char err_msg[128];
+};
+
+enum ws_interval_type {
+ WS_SINE = MKTAG('S','I','N','E'),
+ WS_NOISE = MKTAG('N','O','I','S'),
+};
+
+struct ws_interval {
+ int64_t ts1, ts2;
+ enum ws_interval_type type;
+ uint32_t channels;
+ int32_t f1, f2;
+ int32_t a1, a2;
+ uint32_t phi;
+};
+
+struct ws_intervals {
+ struct ws_interval *inter;
+ int nb_inter;
+ int max_inter;
+};
+
+static void *alloc_array_elem(void **array, size_t elsize,
+ int *size, int *max_size)
+{
+ void *ret;
+
+ if (*size == *max_size) {
+ int m = FFMAX(32, FFMIN(*max_size, INT_MAX / 2) * 2);
+ if (*size >= m)
+ return NULL;
+ *array = av_realloc_f(*array, m, elsize);
+ if (!*array)
+ return NULL;
+ *max_size = m;
+ }
+ ret = (char *)*array + elsize * *size;
+ memset(ret, 0, elsize);
+ (*size)++;
+ return ret;
+}
+
+static int str_to_time(const char *str, int64_t *rtime)
+{
+ const char *cur = str;
+ char *end;
+ int hours, minutes;
+ double seconds = 0;
+
+ if (*cur < '0' || *cur > '9')
+ return 0;
+ hours = strtol(cur, &end, 10);
+ if (end == cur || *end != ':' || end[1] < '0' || end[1] > '9')
+ return 0;
+ cur = end + 1;
+ minutes = strtol(cur, &end, 10);
+ if (end == cur)
+ return 0;
+ cur = end;
+ if (*end == ':'){
+ seconds = strtod(cur + 1, &end);
+ if (end > cur + 1)
+ cur = end;
+ }
+ *rtime = (hours * 3600 + minutes * 60 + seconds) * AV_TIME_BASE;
+ return cur - str;
+}
+
+static inline int is_space(char c)
+{
+ return c == ' ' || c == '\t' || c == '\r';
+}
+
+static inline int scale_double(void *log, double d, double m, int *r)
+{
+ m *= d * SBG_SCALE;
+ if (m < INT_MIN || m >= INT_MAX) {
+ if (log)
+ av_log(log, AV_LOG_ERROR, "%g is too large\n", d);
+ return AVERROR(EDOM);
+ }
+ *r = m;
+ return 0;
+}
+
+static int lex_space(struct sbg_parser *p)
+{
+ char *c = p->cursor;
+
+ while (p->cursor < p->end && is_space(*p->cursor))
+ p->cursor++;
+ return p->cursor > c;
+}
+
+static int lex_char(struct sbg_parser *p, char c)
+{
+ int r = p->cursor < p->end && *p->cursor == c;
+
+ p->cursor += r;
+ return r;
+}
+
+static int lex_double(struct sbg_parser *p, double *r)
+{
+ double d;
+ char *end;
+
+ if (p->cursor == p->end || is_space(*p->cursor) || *p->cursor == '\n')
+ return 0;
+ d = strtod(p->cursor, &end);
+ if (end > p->cursor) {
+ *r = d;
+ p->cursor = end;
+ return 1;
+ }
+ return 0;
+}
+
+static int lex_fixed(struct sbg_parser *p, const char *t, int l)
+{
+ if (p->end - p->cursor < l || memcmp(p->cursor, t, l))
+ return 0;
+ p->cursor += l;
+ return 1;
+}
+
+static int lex_line_end(struct sbg_parser *p)
+{
+ if (p->cursor < p->end && *p->cursor == '#') {
+ p->cursor++;
+ while (p->cursor < p->end && *p->cursor != '\n')
+ p->cursor++;
+ }
+ if (p->cursor == p->end)
+ /* simulate final LF for files lacking it */
+ return 1;
+ if (*p->cursor != '\n')
+ return 0;
+ p->cursor++;
+ p->line_no++;
+ lex_space(p);
+ return 1;
+}
+
+static int lex_wsword(struct sbg_parser *p, struct sbg_string *rs)
+{
+ char *s = p->cursor, *c = s;
+
+ if (s == p->end || *s == '\n')
+ return 0;
+ while (c < p->end && *c != '\n' && !is_space(*c))
+ c++;
+ rs->s = s;
+ rs->e = p->cursor = c;
+ lex_space(p);
+ return 1;
+}
+
+static int lex_name(struct sbg_parser *p, struct sbg_string *rs)
+{
+ char *s = p->cursor, *c = s;
+
+ while (c < p->end && ((*c >= 'a' && *c <= 'z') || (*c >= 'A' && *c <= 'Z')
+ || (*c >= '0' && *c <= '9') || *c == '_' || *c == '-'))
+ c++;
+ if (c == s)
+ return 0;
+ rs->s = s;
+ rs->e = p->cursor = c;
+ return 1;
+}
+
+static int lex_time(struct sbg_parser *p, int64_t *rt)
+{
+ int r = str_to_time(p->cursor, rt);
+ p->cursor += r;
+ return r > 0;
+}
+
+#define FORWARD_ERROR(c) \
+ do { \
+ int errcode = c; \
+ if (errcode <= 0) \
+ return errcode ? errcode : AVERROR_INVALIDDATA; \
+ } while(0);
+
+static int parse_immediate(struct sbg_parser *p)
+{
+ snprintf(p->err_msg, sizeof(p->err_msg),
+ "immediate sequences not yet implemented");
+ return AVERROR_PATCHWELCOME;
+}
+
+static int parse_preprogrammed(struct sbg_parser *p)
+{
+ snprintf(p->err_msg, sizeof(p->err_msg),
+ "preprogrammed sequences not yet implemented");
+ return AVERROR_PATCHWELCOME;
+}
+
+static int parse_optarg(struct sbg_parser *p, char o, struct sbg_string *r)
+{
+ if (!lex_wsword(p, r)) {
+ snprintf(p->err_msg, sizeof(p->err_msg),
+ "option '%c' requires an argument", o);
+ return AVERROR_INVALIDDATA;
+ }
+ return 1;
+}
+
+static int parse_options(struct sbg_parser *p)
+{
+ struct sbg_string ostr, oarg;
+ char mode = 0;
+ int r;
+ char *tptr;
+ double v;
+
+ if (p->cursor == p->end || *p->cursor != '-')
+ return 0;
+ while (lex_char(p, '-') && lex_wsword(p, &ostr)) {
+ for (; ostr.s < ostr.e; ostr.s++) {
+ char opt = *ostr.s;
+ switch (opt) {
+ case 'S':
+ p->scs.opt_start_at_first = 1;
+ break;
+ case 'E':
+ p->scs.opt_end_at_last = 1;
+ break;
+ case 'i':
+ mode = 'i';
+ break;
+ case 'p':
+ mode = 'p';
+ break;
+ case 'F':
+ FORWARD_ERROR(parse_optarg(p, opt, &oarg));
+ v = strtod(oarg.s, &tptr);
+ if (oarg.e != tptr) {
+ snprintf(p->err_msg, sizeof(p->err_msg),
+ "syntax error for option -F");
+ return AVERROR_INVALIDDATA;
+ }
+ p->scs.opt_fade_time = v * AV_TIME_BASE / 1000;
+ break;
+ case 'L':
+ FORWARD_ERROR(parse_optarg(p, opt, &oarg));
+ r = str_to_time(oarg.s, &p->scs.opt_duration);
+ if (oarg.e != oarg.s + r) {
+ snprintf(p->err_msg, sizeof(p->err_msg),
+ "syntax error for option -L");
+ return AVERROR_INVALIDDATA;
+ }
+ break;
+ case 'T':
+ FORWARD_ERROR(parse_optarg(p, opt, &oarg));
+ r = str_to_time(oarg.s, &p->scs.start_ts);
+ if (oarg.e != oarg.s + r) {
+ snprintf(p->err_msg, sizeof(p->err_msg),
+ "syntax error for option -T");
+ return AVERROR_INVALIDDATA;
+ }
+ break;
+ case 'm':
+ FORWARD_ERROR(parse_optarg(p, opt, &oarg));
+ tptr = av_malloc(oarg.e - oarg.s + 1);
+ if (!tptr)
+ return AVERROR(ENOMEM);
+ memcpy(tptr, oarg.s, oarg.e - oarg.s);
+ tptr[oarg.e - oarg.s] = 0;
+ av_free(p->scs.opt_mix);
+ p->scs.opt_mix = tptr;
+ break;
+ case 'q':
+ FORWARD_ERROR(parse_optarg(p, opt, &oarg));
+ v = strtod(oarg.s, &tptr);
+ if (oarg.e != tptr) {
+ snprintf(p->err_msg, sizeof(p->err_msg),
+ "syntax error for option -q");
+ return AVERROR_INVALIDDATA;
+ }
+ if (v != 1) {
+ snprintf(p->err_msg, sizeof(p->err_msg),
+ "speed factor other than 1 not supported");
+ return AVERROR_PATCHWELCOME;
+ }
+ break;
+ case 'r':
+ FORWARD_ERROR(parse_optarg(p, opt, &oarg));
+ r = strtol(oarg.s, &tptr, 10);
+ if (oarg.e != tptr) {
+ snprintf(p->err_msg, sizeof(p->err_msg),
+ "syntax error for option -r");
+ return AVERROR_INVALIDDATA;
+ }
+ if (r < 40) {
+ snprintf(p->err_msg, sizeof(p->err_msg),
+ "invalid sample rate");
+ return AVERROR_PATCHWELCOME;
+ }
+ p->scs.sample_rate = r;
+ break;
+ default:
+ snprintf(p->err_msg, sizeof(p->err_msg),
+ "unknown option: '%c'", *ostr.s);
+ return AVERROR_INVALIDDATA;
+ }
+ }
+ }
+ switch (mode) {
+ case 'i':
+ return parse_immediate(p);
+ case 'p':
+ return parse_preprogrammed(p);
+ case 0:
+ if (!lex_line_end(p))
+ return AVERROR_INVALIDDATA;
+ return 1;
+ }
+ return AVERROR_BUG;
+}
+
+static int parse_timestamp(struct sbg_parser *p,
+ struct sbg_timestamp *rts, int64_t *rrel)
+{
+ int64_t abs = 0, rel = 0, dt;
+ char type = 0;
+ int r;
+
+ if (lex_fixed(p, "NOW", 3)) {
+ type = 'N';
+ r = 1;
+ } else {
+ r = lex_time(p, &abs);
+ if (r)
+ type = 'T';
+ }
+ while (lex_char(p, '+')) {
+ if (!lex_time(p, &dt))
+ return AVERROR_INVALIDDATA;
+ rel += dt;
+ r = 1;
+ }
+ if (r) {
+ if (!lex_space(p))
+ return AVERROR_INVALIDDATA;
+ rts->type = type;
+ rts->t = abs;
+ *rrel = rel;
+ }
+ return r;
+}
+
+static int parse_fade(struct sbg_parser *p, struct sbg_fade *fr)
+{
+ struct sbg_fade f;
+
+ if (lex_char(p, '<'))
+ f.in = SBG_FADE_SILENCE;
+ else if (lex_char(p, '-'))
+ f.in = SBG_FADE_SAME;
+ else if (lex_char(p, '='))
+ f.in = SBG_FADE_ADAPT;
+ else
+ return 0;
+ if (lex_char(p, '>'))
+ f.out = SBG_FADE_SILENCE;
+ else if (lex_char(p, '-'))
+ f.out = SBG_FADE_SAME;
+ else if (lex_char(p, '='))
+ f.out = SBG_FADE_ADAPT;
+ else
+ return AVERROR_INVALIDDATA;
+ *fr = f;
+ return 1;
+}
+
+static int parse_time_sequence(struct sbg_parser *p, int inblock)
+{
+ struct sbg_timestamp ts;
+ int64_t rel_ts;
+ int r;
+ struct sbg_fade fade = { SBG_FADE_SAME, SBG_FADE_SAME, 0 };
+ struct sbg_string name;
+ struct sbg_script_tseq *tseq;
+
+ r = parse_timestamp(p, &ts, &rel_ts);
+ if (!r)
+ return 0;
+ if (r < 0)
+ return r;
+ if (ts.type) {
+ if (inblock)
+ return AVERROR_INVALIDDATA;
+ p->current_time.type = ts.type;
+ p->current_time.t = ts.t;
+ } else if(!inblock && !p->current_time.type) {
+ snprintf(p->err_msg, sizeof(p->err_msg),
+ "relative time without previous absolute time");
+ return AVERROR_INVALIDDATA;
+ }
+ ts.type = p->current_time.type;
+ ts.t = p->current_time.t + rel_ts;
+ r = parse_fade(p, &fade);
+ if (r < 0)
+ return r;
+ lex_space(p);
+ if (!lex_name(p, &name))
+ return AVERROR_INVALIDDATA;
+ lex_space(p);
+ if (lex_fixed(p, "->", 2)) {
+ fade.slide = SBG_FADE_ADAPT;
+ lex_space(p);
+ }
+ if (!lex_line_end(p))
+ return AVERROR_INVALIDDATA;
+ tseq = inblock ?
+ alloc_array_elem((void **)&p->scs.block_tseq, sizeof(*tseq),
+ &p->nb_block_tseq, &p->nb_block_tseq_max) :
+ alloc_array_elem((void **)&p->scs.tseq, sizeof(*tseq),
+ &p->scs.nb_tseq, &p->nb_tseq_max);
+ if (!tseq)
+ return AVERROR(ENOMEM);
+ tseq->ts = ts;
+ tseq->name = name.s;
+ tseq->name_len = name.e - name.s;
+ tseq->fade = fade;
+ return 1;
+}
+
+static int parse_wave_def(struct sbg_parser *p, int wavenum)
+{
+ snprintf(p->err_msg, sizeof(p->err_msg),
+ "waveform definitions not yet implemented");
+ return AVERROR_PATCHWELCOME;
+}
+
+static int parse_block_def(struct sbg_parser *p,
+ struct sbg_script_definition *def)
+{
+ int r, tseq;
+
+ lex_space(p);
+ if (!lex_line_end(p))
+ return AVERROR_INVALIDDATA;
+ tseq = p->nb_block_tseq;
+ while (1) {
+ r = parse_time_sequence(p, 1);
+ if (r < 0)
+ return r;
+ if (!r)
+ break;
+ }
+ if (!lex_char(p, '}'))
+ return AVERROR_INVALIDDATA;
+ lex_space(p);
+ if (!lex_line_end(p))
+ return AVERROR_INVALIDDATA;
+ def->type = 'B';
+ def->elements = tseq;
+ def->nb_elements = p->nb_block_tseq - tseq;
+ if (!def->nb_elements)
+ return AVERROR_INVALIDDATA;
+ return 1;
+}
+
+static int parse_volume(struct sbg_parser *p, int *vol)
+{
+ double v;
+
+ if (!lex_char(p, '/'))
+ return 0;
+ if (!lex_double(p, &v))
+ return AVERROR_INVALIDDATA;
+ if (scale_double(p->log, v, 0.01, vol))
+ return AVERROR(ERANGE);
+ return 1;
+}
+
+static int parse_synth_channel_sine(struct sbg_parser *p,
+ struct sbg_script_synth *synth)
+{
+ double carrierf, beatf;
+ int carrier, beat, vol;
+
+ if (!lex_double(p, &carrierf))
+ return 0;
+ if (!lex_double(p, &beatf))
+ beatf = 0;
+ FORWARD_ERROR(parse_volume(p, &vol));
+ if (scale_double(p->log, carrierf, 1, &carrier) < 0 ||
+ scale_double(p->log, beatf, 1, &beat) < 0)
+ return AVERROR(EDOM);
+ synth->type = SBG_TYPE_SINE;
+ synth->carrier = carrier;
+ synth->beat = beat;
+ synth->vol = vol;
+ return 1;
+}
+
+static int parse_synth_channel_pink(struct sbg_parser *p,
+ struct sbg_script_synth *synth)
+{
+ int vol;
+
+ if (!lex_fixed(p, "pink", 4))
+ return 0;
+ FORWARD_ERROR(parse_volume(p, &vol));
+ synth->type = SBG_TYPE_NOISE;
+ synth->vol = vol;
+ return 1;
+}
+
+static int parse_synth_channel_bell(struct sbg_parser *p,
+ struct sbg_script_synth *synth)
+{
+ double carrierf;
+ int carrier, vol;
+
+ if (!lex_fixed(p, "bell", 4))
+ return 0;
+ if (!lex_double(p, &carrierf))
+ return AVERROR_INVALIDDATA;
+ FORWARD_ERROR(parse_volume(p, &vol));
+ if (scale_double(p->log, carrierf, 1, &carrier) < 0)
+ return AVERROR(EDOM);
+ synth->type = SBG_TYPE_BELL;
+ synth->carrier = carrier;
+ synth->vol = vol;
+ return 1;
+}
+
+static int parse_synth_channel_mix(struct sbg_parser *p,
+ struct sbg_script_synth *synth)
+{
+ int vol;
+
+ if (!lex_fixed(p, "mix", 3))
+ return 0;
+ FORWARD_ERROR(parse_volume(p, &vol));
+ synth->type = SBG_TYPE_MIX;
+ synth->vol = vol;
+ return 1;
+}
+
+static int parse_synth_channel_spin(struct sbg_parser *p,
+ struct sbg_script_synth *synth)
+{
+ double carrierf, beatf;
+ int carrier, beat, vol;
+
+ if (!lex_fixed(p, "spin:", 5))
+ return 0;
+ if (!lex_double(p, &carrierf))
+ return AVERROR_INVALIDDATA;
+ if (!lex_double(p, &beatf))
+ return AVERROR_INVALIDDATA;
+ FORWARD_ERROR(parse_volume(p, &vol));
+ if (scale_double(p->log, carrierf, 1, &carrier) < 0 ||
+ scale_double(p->log, beatf, 1, &beat) < 0)
+ return AVERROR(EDOM);
+ synth->type = SBG_TYPE_SPIN;
+ synth->carrier = carrier;
+ synth->beat = beat;
+ synth->vol = vol;
+ return 1;
+}
+
+static int parse_synth_channel(struct sbg_parser *p)
+{
+ int r;
+ struct sbg_script_synth *synth;
+
+ synth = alloc_array_elem((void **)&p->scs.synth, sizeof(*synth),
+ &p->scs.nb_synth, &p->nb_synth_max);
+ if (!synth)
+ return AVERROR(ENOMEM);
+ r = lex_char(p, '-');
+ if (!r)
+ r = parse_synth_channel_pink(p, synth);
+ if (!r)
+ r = parse_synth_channel_bell(p, synth);
+ if (!r)
+ r = parse_synth_channel_mix(p, synth);
+ if (!r)
+ r = parse_synth_channel_spin(p, synth);
+ /* Unimplemented: wave%d:%f%f/vol (carrier, beat) */
+ if (!r)
+ r = parse_synth_channel_sine(p, synth);
+ if (r <= 0)
+ p->scs.nb_synth--;
+ return r;
+}
+
+static int parse_synth_def(struct sbg_parser *p,
+ struct sbg_script_definition *def)
+{
+ int r, synth;
+
+ synth = p->scs.nb_synth;
+ while (1) {
+ r = parse_synth_channel(p);
+ if (r < 0)
+ return r;
+ if (!r || !lex_space(p))
+ break;
+ }
+ lex_space(p);
+ if (synth == p->scs.nb_synth)
+ return AVERROR_INVALIDDATA;
+ if (!lex_line_end(p))
+ return AVERROR_INVALIDDATA;
+ def->type = 'S';
+ def->elements = synth;
+ def->nb_elements = p->scs.nb_synth - synth;
+ return 1;
+}
+
+static int parse_named_def(struct sbg_parser *p)
+{
+ char *cursor_save = p->cursor;
+ struct sbg_string name;
+ struct sbg_script_definition *def;
+
+ if (!lex_name(p, &name) || !lex_char(p, ':') || !lex_space(p)) {
+ p->cursor = cursor_save;
+ return 0;
+ }
+ if (name.e - name.s == 6 && !memcmp(name.s, "wave", 4) &&
+ name.s[4] >= '0' && name.s[4] <= '9' &&
+ name.s[5] >= '0' && name.s[5] <= '9') {
+ int wavenum = (name.s[4] - '0') * 10 + (name.s[5] - '0');
+ return parse_wave_def(p, wavenum);
+ }
+ def = alloc_array_elem((void **)&p->scs.def, sizeof(*def),
+ &p->scs.nb_def, &p->nb_def_max);
+ if (!def)
+ return AVERROR(ENOMEM);
+ def->name = name.s;
+ def->name_len = name.e - name.s;
+ if (lex_char(p, '{'))
+ return parse_block_def(p, def);
+ return parse_synth_def(p, def);
+}
+
+static void free_script(struct sbg_script *s)
+{
+ av_freep(&s->def);
+ av_freep(&s->synth);
+ av_freep(&s->tseq);
+ av_freep(&s->block_tseq);
+ av_freep(&s->events);
+ av_freep(&s->opt_mix);
+}
+
+static int parse_script(void *log, char *script, int script_len,
+ struct sbg_script *rscript)
+{
+ struct sbg_parser sp = {
+ .log = log,
+ .script = script,
+ .end = script + script_len,
+ .cursor = script,
+ .line_no = 1,
+ .err_msg = "",
+ .scs = {
+ /* default values */
+ .start_ts = AV_NOPTS_VALUE,
+ .sample_rate = 44100,
+ .opt_fade_time = 60 * AV_TIME_BASE,
+ },
+ };
+ int r;
+
+ lex_space(&sp);
+ while (sp.cursor < sp.end) {
+ r = parse_options(&sp);
+ if (r < 0)
+ goto fail;
+ if (!r && !lex_line_end(&sp))
+ break;
+ }
+ while (sp.cursor < sp.end) {
+ r = parse_named_def(&sp);
+ if (!r)
+ r = parse_time_sequence(&sp, 0);
+ if (!r)
+ r = lex_line_end(&sp) ? 1 : AVERROR_INVALIDDATA;
+ if (r < 0)
+ goto fail;
+ }
+ *rscript = sp.scs;
+ return 1;
+fail:
+ free_script(&sp.scs);
+ if (!*sp.err_msg)
+ if (r == AVERROR_INVALIDDATA)
+ snprintf(sp.err_msg, sizeof(sp.err_msg), "syntax error");
+ if (log && *sp.err_msg) {
+ const char *ctx = sp.cursor;
+ const char *ectx = av_x_if_null(memchr(ctx, '\n', sp.end - sp.cursor),
+ sp.end);
+ int lctx = ectx - ctx;
+ const char *quote = "\"";
+ if (lctx > 0 && ctx[lctx - 1] == '\r')
+ lctx--;
+ if (lctx == 0) {
+ ctx = "the end of line";
+ lctx = strlen(ctx);
+ quote = "";
+ }
+ av_log(log, AV_LOG_ERROR, "Error line %d: %s near %s%.*s%s.\n",
+ sp.line_no, sp.err_msg, quote, lctx, ctx, quote);
+ }
+ return r;
+}
+
+static int read_whole_file(AVIOContext *io, int max_size, char **rbuf)
+{
+ char *buf = NULL;
+ int size = 0, bufsize = 0, r;
+
+ while (1) {
+ if (bufsize - size < 1024) {
+ bufsize = FFMIN(FFMAX(2 * bufsize, 8192), max_size);
+ if (bufsize - size < 2) {
+ size = AVERROR(EFBIG);
+ goto fail;
+ }
+ buf = av_realloc_f(buf, bufsize, 1);
+ if (!buf) {
+ size = AVERROR(ENOMEM);
+ goto fail;
+ }
+ }
+ r = avio_read(io, buf, bufsize - size - 1);
+ if (r == AVERROR_EOF)
+ break;
+ if (r < 0)
+ goto fail;
+ size += r;
+ }
+ buf[size] = 0;
+ *rbuf = buf;
+ return size;
+fail:
+ av_free(buf);
+ return size;
+}
+
+static void expand_timestamps(void *log, struct sbg_script *s)
+{
+ int i, nb_rel = 0;
+ int64_t now, cur_ts, delta = 0;
+
+ for (i = 0; i < s->nb_tseq; i++)
+ nb_rel += s->tseq[i].ts.type == 'N';
+ if (nb_rel == s->nb_tseq) {
+ /* All ts are relative to NOW: consider NOW = 0 */
+ now = 0;
+ if (s->start_ts != AV_NOPTS_VALUE)
+ av_log(log, AV_LOG_WARNING,
+ "Start time ignored in a purely relative script.\n");
+ } else if (nb_rel == 0 && s->start_ts != AV_NOPTS_VALUE ||
+ s->opt_start_at_first) {
+ /* All ts are absolute and start time is specified */
+ if (s->start_ts == AV_NOPTS_VALUE)
+ s->start_ts = s->tseq[0].ts.t;
+ now = s->start_ts;
+ } else {
+ /* Mixed relative/absolute ts: expand */
+ time_t now0;
+ struct tm *tm;
+
+ av_log(log, AV_LOG_WARNING,
+ "Scripts with mixed absolute and relative timestamps can give "
+ "unexpected results (pause, seeking, time zone change).\n");
+#undef time
+ time(&now0);
+ tm = localtime(&now0);
+ now = tm ? tm->tm_hour * 3600 + tm->tm_min * 60 + tm->tm_sec :
+ now0 % DAY;
+ av_log(log, AV_LOG_INFO, "Using %02d:%02d:%02d as NOW.\n",
+ (int)(now / 3600), (int)(now / 60) % 60, (int)now % 60);
+ now *= AV_TIME_BASE;
+ for (i = 0; i < s->nb_tseq; i++) {
+ if (s->tseq[i].ts.type == 'N') {
+ s->tseq[i].ts.t += now;
+ s->tseq[i].ts.type = 'T'; /* not necessary */
+ }
+ }
+ }
+ if (s->start_ts == AV_NOPTS_VALUE)
+ s->start_ts = s->opt_start_at_first ? s->tseq[0].ts.t : now;
+ s->end_ts = s->opt_duration ? s->start_ts + s->opt_duration :
+ AV_NOPTS_VALUE; /* may be overridden later by -E option */
+ cur_ts = now;
+ for (i = 0; i < s->nb_tseq; i++) {
+ if (s->tseq[i].ts.t + delta < cur_ts)
+ delta += DAY_TS;
+ cur_ts = s->tseq[i].ts.t += delta;
+ }
+}
+
+static int expand_tseq(void *log, struct sbg_script *s, int *nb_ev_max,
+ int64_t t0, struct sbg_script_tseq *tseq)
+{
+ int i, r;
+ struct sbg_script_definition *def;
+ struct sbg_script_tseq *be;
+ struct sbg_script_event *ev;
+
+ if (tseq->lock++) {
+ av_log(log, 16, "Recursion loop on \"%.*s\"\n",
+ tseq->name_len, tseq->name);
+ return AVERROR(ELOOP);
+ }
+ t0 += tseq->ts.t;
+ for (i = 0; i < s->nb_def; i++) {
+ if (s->def[i].name_len == tseq->name_len &&
+ !memcmp(s->def[i].name, tseq->name, tseq->name_len))
+ break;
+ }
+ if (i >= s->nb_def) {
+ av_log(log, 16, "Tone-set \"%.*s\" not defined\n",
+ tseq->name_len, tseq->name);
+ return AVERROR(EINVAL);
+ }
+ def = &s->def[i];
+ if (def->type == 'B') {
+ be = s->block_tseq + def->elements;
+ for (i = 0; i < def->nb_elements; i++) {
+ r = expand_tseq(log, s, nb_ev_max, t0, &be[i]);
+ if (r < 0)
+ return r;
+ }
+ } else {
+ ev = alloc_array_elem((void **)&s->events, sizeof(*ev),
+ &s->nb_events, nb_ev_max);
+ ev->ts = tseq->ts.t;
+ ev->elements = def->elements;
+ ev->nb_elements = def->nb_elements;
+ ev->fade = tseq->fade;
+ }
+ tseq->lock--;
+ return 0;
+}
+
+static int expand_script(void *log, struct sbg_script *s)
+{
+ int i, r, nb_events_max = 0;
+
+ expand_timestamps(log, s);
+ for (i = 0; i < s->nb_tseq; i++) {
+ r = expand_tseq(log, s, &nb_events_max, 0, &s->tseq[i]);
+ if (r < 0)
+ return r;
+ }
+ if (!s->nb_events) {
+ av_log(log, AV_LOG_ERROR, "No events in script\n");
+ return AVERROR_INVALIDDATA;
+ }
+ if (s->opt_end_at_last)
+ s->end_ts = s->events[s->nb_events - 1].ts;
+ return 0;
+}
+
+static int add_interval(struct ws_intervals *inter,
+ enum ws_interval_type type, uint32_t channels, int ref,
+ int64_t ts1, int32_t f1, int32_t a1,
+ int64_t ts2, int32_t f2, int32_t a2)
+{
+ struct ws_interval *i, *ri;
+
+ if (ref >= 0) {
+ ri = &inter->inter[ref];
+ /* ref and new intervals are constant, identical and adjacent */
+ if (ri->type == type && ri->channels == channels &&
+ ri->f1 == ri->f2 && ri->f2 == f1 && f1 == f2 &&
+ ri->a1 == ri->a2 && ri->a2 == a1 && a1 == a2 &&
+ ri->ts2 == ts1) {
+ ri->ts2 = ts2;
+ return ref;
+ }
+ }
+ i = alloc_array_elem((void **)&inter->inter, sizeof(*i),
+ &inter->nb_inter, &inter->max_inter);
+ if (!i)
+ return AVERROR(ENOMEM);
+ i->ts1 = ts1;
+ i->ts2 = ts2;
+ i->type = type;
+ i->channels = channels;
+ i->f1 = f1;
+ i->f2 = f2;
+ i->a1 = a1;
+ i->a2 = a2;
+ i->phi = ref >= 0 ? ref | 0x80000000 : 0;
+ return i - inter->inter;
+}
+
+static int add_bell(struct ws_intervals *inter, struct sbg_script *s,
+ int64_t ts1, int64_t ts2, int32_t f, int32_t a)
+{
+ /* SBaGen uses an exponential decrease every 50ms.
+ We approximate it with piecewise affine segments. */
+ int32_t cpoints[][2] = {
+ { 2, a },
+ { 4, a - a / 4 },
+ { 8, a / 2 },
+ { 16, a / 4 },
+ { 25, a / 10 },
+ { 50, a / 80 },
+ { 75, 0 },
+ };
+ int i, r;
+ int64_t dt = s->sample_rate / 20, ts3 = ts1, ts4;
+ for (i = 0; i < FF_ARRAY_ELEMS(cpoints); i++) {
+ ts4 = FFMIN(ts2, ts1 + cpoints[i][0] * dt);
+ r = add_interval(inter, WS_SINE, 3, -1,
+ ts3, f, a, ts4, f, cpoints[i][1]);
+ if (r < 0)
+ return r;
+ ts3 = ts4;
+ a = cpoints[i][1];
+ }
+ return 0;
+}
+
+static int generate_interval(void *log, struct sbg_script *s,
+ struct ws_intervals *inter,
+ int64_t ts1, int64_t ts2,
+ struct sbg_script_synth *s1,
+ struct sbg_script_synth *s2,
+ int transition)
+{
+ int r;
+
+ if (ts2 <= ts1 || (s1->vol == 0 && s2->vol == 0))
+ return 0;
+ switch (s1->type) {
+ case SBG_TYPE_NONE:
+ break;
+ case SBG_TYPE_SINE:
+ if (s1->beat == 0 && s2->beat == 0) {
+ r = add_interval(inter, WS_SINE, 3, s1->ref.l,
+ ts1, s1->carrier, s1->vol,
+ ts2, s2->carrier, s2->vol);
+ if (r < 0)
+ return r;
+ s2->ref.l = s2->ref.r = r;
+ } else {
+ r = add_interval(inter, WS_SINE, 1, s1->ref.l,
+ ts1, s1->carrier + s1->beat / 2, s1->vol,
+ ts2, s2->carrier + s2->beat / 2, s2->vol);
+ if (r < 0)
+ return r;
+ s2->ref.l = r;
+ r = add_interval(inter, WS_SINE, 2, s1->ref.r,
+ ts1, s1->carrier - s1->beat / 2, s1->vol,
+ ts2, s2->carrier - s2->beat / 2, s2->vol);
+ if (r < 0)
+ return r;
+ s2->ref.r = r;
+ }
+ break;
+
+ case SBG_TYPE_BELL:
+ if (transition == 2) {
+ r = add_bell(inter, s, ts1, ts2, s1->carrier, s2->vol);
+ if (r < 0)
+ return r;
+ }
+ break;
+
+ case SBG_TYPE_SPIN:
+ av_log(log, AV_LOG_WARNING, "Spinning noise not implemented, "
+ "using pink noise instead.\n");
+ /* fall through */
+ case SBG_TYPE_NOISE:
+ /* SBaGen's pink noise generator uses:
+ - 1 band of white noise, mean square: 1/3;
+ - 9 bands of subsampled white noise with linear
+ interpolation, mean square: 2/3 each;
+ with 1/10 weight each: the total mean square is 7/300.
+ Our pink noise generator uses 8 bands of white noise with
+ rectangular subsampling: the total mean square is 1/24.
+ Therefore, to match SBaGen's volume, we must multiply vol by
+ sqrt((7/300) / (1/24)) = sqrt(14/25) =~ 0.748
+ */
+ r = add_interval(inter, WS_NOISE, 3, s1->ref.l,
+ ts1, 0, s1->vol - s1->vol / 4,
+ ts2, 0, s2->vol - s2->vol / 4);
+ if (r < 0)
+ return r;
+ s2->ref.l = s2->ref.r = r;
+ break;
+
+ case SBG_TYPE_MIX:
+ /* Unimplemented: silence; warning present elsewhere */
+ default:
+ av_log(log, AV_LOG_ERROR,
+ "Type %d is not implemented\n", s1->type);
+ return AVERROR_PATCHWELCOME;
+ }
+ return 0;
+}
+
+static int generate_plateau(void *log, struct sbg_script *s,
+ struct ws_intervals *inter,
+ struct sbg_script_event *ev1)
+{
+ int64_t ts1 = ev1->ts_int, ts2 = ev1->ts_trans;
+ int i, r;
+ struct sbg_script_synth *s1;
+
+ for (i = 0; i < ev1->nb_elements; i++) {
+ s1 = &s->synth[ev1->elements + i];
+ r = generate_interval(log, s, inter, ts1, ts2, s1, s1, 0);
+ if (r < 0)
+ return r;
+ }
+ return 0;
+}
+
+/*
+
+ ts1 ts2 ts1 tsmid ts2
+ | | | | |
+ v v v | v
+____ ____ v ____
+ ''''.... ''.. ..''
+ ''''....____ ''....''
+
+ compatible transition incompatible transition
+ */
+
+static int generate_transition(void *log, struct sbg_script *s,
+ struct ws_intervals *inter,
+ struct sbg_script_event *ev1,
+ struct sbg_script_event *ev2)
+{
+ int64_t ts1 = ev1->ts_trans, ts2 = ev1->ts_next;
+ /* (ts1 + ts2) / 2 without overflow */
+ int64_t tsmid = (ts1 >> 1) + (ts2 >> 1) + (ts1 & ts2 & 1);
+ enum sbg_fade_type type = ev1->fade.slide | (ev1->fade.out & ev2->fade.in);
+ int nb_elements = FFMAX(ev1->nb_elements, ev2->nb_elements);
+ struct sbg_script_synth *s1, *s2, s1mod, s2mod, smid;
+ int pass, i, r;
+
+ for (pass = 0; pass < 2; pass++) {
+ /* pass = 0 -> compatible and first half of incompatible
+ pass = 1 -> second half of incompatible
+ Using two passes like that ensures that the intervals are generated
+ in increasing order according to their start timestamp.
+ Otherwise it would be necessary to sort them
+ while keeping the mutual references.
+ */
+ for (i = 0; i < nb_elements; i++) {
+ s1 = i < ev1->nb_elements ? &s->synth[ev1->elements + i] : &s1mod;
+ s2 = i < ev2->nb_elements ? &s->synth[ev2->elements + i] : &s2mod;
+ s1mod = s1 != &s1mod ? *s1 : (struct sbg_script_synth){ 0 };
+ s2mod = s2 != &s2mod ? *s2 : (struct sbg_script_synth){ 0 };
+ if (ev1->fade.slide) {
+ /* for slides, and only for slides, silence ("-") is equivalent
+ to anything with volume 0 */
+ if (s1mod.type == SBG_TYPE_NONE) {
+ s1mod = s2mod;
+ s1mod.vol = 0;
+ } else if (s2mod.type == SBG_TYPE_NONE) {
+ s2mod = s1mod;
+ s2mod.vol = 0;
+ }
+ }
+ if (s1mod.type == s2mod.type &&
+ s1mod.type != SBG_TYPE_BELL &&
+ (type == SBG_FADE_ADAPT ||
+ (s1mod.carrier == s2mod.carrier &&
+ s1mod.beat == s2mod.beat))) {
+ /* compatible: single transition */
+ if (!pass) {
+ r = generate_interval(log, s, inter,
+ ts1, ts2, &s1mod, &s2mod, 3);
+ if (r < 0)
+ return r;
+ s2->ref = s2mod.ref;
+ }
+ } else {
+ /* incompatible: silence at midpoint */
+ if (!pass) {
+ smid = s1mod;
+ smid.vol = 0;
+ r = generate_interval(log, s, inter,
+ ts1, tsmid, &s1mod, &smid, 1);
+ if (r < 0)
+ return r;
+ } else {
+ smid = s2mod;
+ smid.vol = 0;
+ r = generate_interval(log, s, inter,
+ tsmid, ts2, &smid, &s2mod, 2);
+ if (r < 0)
+ return r;
+ s2->ref = s2mod.ref;
+ }
+ }
+ }
+ }
+ return 0;
+}
+
+/*
+ ev1 trats ev2 intts endts ev3
+ | | | | | |
+ v v v v v v
+ ________________
+.... .... ....
+ '''....________________....''' '''...._______________
+
+\_________/\______________/\_________/\______________/\_________/\_____________/
+ tr x->1 int1 tr 1->2 int2 tr 2->3 int3
+ */
+
+static int generate_intervals(void *log, struct sbg_script *s, int sample_rate,
+ struct ws_intervals *inter)
+{
+ int64_t trans_time = s->opt_fade_time / 2;
+ struct sbg_script_event ev0, *ev1, *ev2;
+ int64_t period;
+ int i, r;
+
+ /* SBaGen handles the time before and after the extremal events,
+ and the corresponding transitions, as if the sequence were cyclic
+ with a 24-hours period. */
+ period = s->events[s->nb_events - 1].ts - s->events[0].ts;
+ period = (period + (DAY_TS - 1)) / DAY_TS * DAY_TS;
+ period = FFMAX(period, DAY_TS);
+
+ /* Prepare timestamps for transitions */
+ for (i = 0; i < s->nb_events; i++) {
+ ev1 = &s->events[i];
+ ev2 = &s->events[(i + 1) % s->nb_events];
+ ev1->ts_int = ev1->ts;
+ ev1->ts_trans = ev1->fade.slide ? ev1->ts
+ : ev2->ts + (ev1 < ev2 ? 0 : period);
+ }
+ for (i = 0; i < s->nb_events; i++) {
+ ev1 = &s->events[i];
+ ev2 = &s->events[(i + 1) % s->nb_events];
+ if (!ev1->fade.slide) {
+ ev1->ts_trans = FFMAX(ev1->ts_int, ev1->ts_trans - trans_time);
+ ev2->ts_int = FFMIN(ev2->ts_trans, ev2->ts_int + trans_time);
+ }
+ ev1->ts_next = ev2->ts_int + (ev1 < ev2 ? 0 : period);
+ }
+
+ /* Pseudo event before the first one */
+ ev0 = s->events[s->nb_events - 1];
+ ev0.ts_int -= period;
+ ev0.ts_trans -= period;
+ ev0.ts_next -= period;
+
+ /* Convert timestamps */
+ for (i = -1; i < s->nb_events; i++) {
+ ev1 = i < 0 ? &ev0 : &s->events[i];
+ ev1->ts_int = av_rescale(ev1->ts_int, sample_rate, AV_TIME_BASE);
+ ev1->ts_trans = av_rescale(ev1->ts_trans, sample_rate, AV_TIME_BASE);
+ ev1->ts_next = av_rescale(ev1->ts_next, sample_rate, AV_TIME_BASE);
+ }
+
+ /* Generate intervals */
+ for (i = 0; i < s->nb_synth; i++)
+ s->synth[i].ref.l = s->synth[i].ref.r = -1;
+ for (i = -1; i < s->nb_events; i++) {
+ ev1 = i < 0 ? &ev0 : &s->events[i];
+ ev2 = &s->events[(i + 1) % s->nb_events];
+ r = generate_plateau(log, s, inter, ev1);
+ if (r < 0)
+ return r;
+ r = generate_transition(log, s, inter, ev1, ev2);
+ if (r < 0)
+ return r;
+ }
+ if (!inter->nb_inter)
+ av_log(log, AV_LOG_WARNING, "Completely silent script.\n");
+ return 0;
+}
+
+static int encode_intervals(struct sbg_script *s, AVCodecContext *avc,
+ struct ws_intervals *inter)
+{
+ int i, edata_size = 4;
+ uint8_t *edata;
+
+ for (i = 0; i < inter->nb_inter; i++) {
+ edata_size += inter->inter[i].type == WS_SINE ? 44 :
+ inter->inter[i].type == WS_NOISE ? 32 : 0;
+ if (edata_size < 0)
+ return AVERROR(EOVERFLOW);
+ }
+ edata = av_malloc(edata_size);
+ if (!edata)
+ return AVERROR(ENOMEM);
+ avc->extradata = edata;
+ avc->extradata_size = edata_size;
+
+#define ADD_EDATA32(v) do { AV_WL32(edata, (v)); edata += 4; } while(0)
+#define ADD_EDATA64(v) do { AV_WL64(edata, (v)); edata += 8; } while(0)
+ ADD_EDATA32(inter->nb_inter);
+ for (i = 0; i < inter->nb_inter; i++) {
+ ADD_EDATA64(inter->inter[i].ts1);
+ ADD_EDATA64(inter->inter[i].ts2);
+ ADD_EDATA32(inter->inter[i].type);
+ ADD_EDATA32(inter->inter[i].channels);
+ switch (inter->inter[i].type) {
+ case WS_SINE:
+ ADD_EDATA32(inter->inter[i].f1);
+ ADD_EDATA32(inter->inter[i].f2);
+ ADD_EDATA32(inter->inter[i].a1);
+ ADD_EDATA32(inter->inter[i].a2);
+ ADD_EDATA32(inter->inter[i].phi);
+ break;
+ case WS_NOISE:
+ ADD_EDATA32(inter->inter[i].a1);
+ ADD_EDATA32(inter->inter[i].a2);
+ break;
+ }
+ }
+ if (edata != avc->extradata + edata_size)
+ return AVERROR_BUG;
+ return 0;
+}
+
+static av_cold int sbg_read_probe(AVProbeData *p)
+{
+ int r, score;
+ struct sbg_script script = { 0 };
+
+ r = parse_script(NULL, p->buf, p->buf_size, &script);
+ score = r < 0 || !script.nb_def || !script.nb_tseq ? 0 :
+ AVPROBE_SCORE_MAX / 3;
+ free_script(&script);
+ return score;
+}
+
+static av_cold int sbg_read_header(AVFormatContext *avf,
+ AVFormatParameters *ap)
+{
+ struct sbg_demuxer *sbg = avf->priv_data;
+ int r;
+ char *buf = NULL;
+ struct sbg_script script = { 0 };
+ AVStream *st;
+ struct ws_intervals inter = { 0 };
+
+ r = read_whole_file(avf->pb, sbg->max_file_size, &buf);
+ if (r < 0)
+ goto fail;
+ r = parse_script(avf, buf, r, &script);
+ if (r < 0)
+ goto fail;
+ if (!sbg->sample_rate)
+ sbg->sample_rate = script.sample_rate;
+ else
+ script.sample_rate = sbg->sample_rate;
+ if (!sbg->frame_size)
+ sbg->frame_size = FFMAX(1, sbg->sample_rate / 10);
+ if (script.opt_mix)
+ av_log(avf, AV_LOG_WARNING, "Mix feature not implemented: "
+ "-m is ignored and mix channels will be silent.\n");
+ r = expand_script(avf, &script);
+ if (r < 0)
+ goto fail;
+ av_freep(&buf);
+ r = generate_intervals(avf, &script, sbg->sample_rate, &inter);
+ if (r < 0)
+ goto fail;
+
+ st = avformat_new_stream(avf, NULL);
+ if (!st)
+ return AVERROR(ENOMEM);
+ st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
+ st->codec->codec_id = CODEC_ID_FFWAVESYNTH;
+ st->codec->channels = 2;
+ st->codec->channel_layout = AV_CH_LAYOUT_STEREO;
+ st->codec->sample_rate = sbg->sample_rate;
+ st->codec->frame_size = sbg->frame_size;
+ avpriv_set_pts_info(st, 64, 1, st->codec->sample_rate);
+ st->probe_packets = 0;
+ st->start_time = av_rescale(script.start_ts,
+ sbg->sample_rate, AV_TIME_BASE);
+ st->duration = script.end_ts == AV_NOPTS_VALUE ? AV_NOPTS_VALUE :
+ av_rescale(script.end_ts - script.start_ts,
+ sbg->sample_rate, AV_TIME_BASE);
+ st->cur_dts = st->start_time;
+ r = encode_intervals(&script, st->codec, &inter);
+ if (r < 0)
+ goto fail;
+
+ av_free(inter.inter);
+ free_script(&script);
+ return 0;
+
+fail:
+ av_free(inter.inter);
+ free_script(&script);
+ av_free(buf);
+ return r;
+}
+
+static int sbg_read_packet(AVFormatContext *avf, AVPacket *packet)
+{
+ int64_t ts, end_ts;
+
+ ts = avf->streams[0]->cur_dts;
+ end_ts = ts + avf->streams[0]->codec->frame_size;
+ if (avf->streams[0]->duration != AV_NOPTS_VALUE)
+ end_ts = FFMIN(avf->streams[0]->start_time + avf->streams[0]->duration,
+ end_ts);
+ if (end_ts <= ts)
+ return AVERROR_EOF;
+ if (av_new_packet(packet, 12) < 0)
+ return AVERROR(ENOMEM);
+ packet->dts = packet->pts = ts;
+ packet->duration = end_ts - ts;
+ AV_WL64(packet->data + 0, ts);
+ AV_WL32(packet->data + 8, packet->duration);
+ return packet->size;
+}
+
+static int sbg_read_seek2(AVFormatContext *avf, int stream_index,
+ int64_t min_ts, int64_t ts, int64_t max_ts, int flags)
+{
+ if (flags || stream_index > 0)
+ return AVERROR(ENOTSUP);
+ if (stream_index < 0)
+ ts = av_rescale_q(ts, AV_TIME_BASE_Q, avf->streams[0]->time_base);
+ avf->streams[0]->cur_dts = ts;
+ return 0;
+}
+
+#if FF_API_READ_SEEK
+static int sbg_read_seek(AVFormatContext *avf, int stream_index,
+ int64_t ts, int flags)
+{
+ return sbg_read_seek2(avf, stream_index, ts, ts, ts, 0);
+}
+#endif
+
+static const AVOption sbg_options[] = {
+ { "sample_rate", "", offsetof(struct sbg_demuxer, sample_rate),
+ AV_OPT_TYPE_INT, { .dbl = 0 }, 0, INT_MAX,
+ AV_OPT_FLAG_DECODING_PARAM },
+ { "frame_size", "", offsetof(struct sbg_demuxer, frame_size),
+ AV_OPT_TYPE_INT, { .dbl = 0 }, 0, INT_MAX,
+ AV_OPT_FLAG_DECODING_PARAM },
+ { "max_file_size", "", offsetof(struct sbg_demuxer, max_file_size),
+ AV_OPT_TYPE_INT, { .dbl = 5000000 }, 0, INT_MAX,
+ AV_OPT_FLAG_DECODING_PARAM },
+ { NULL },
+};
+
+static const AVClass sbg_demuxer_class = {
+ .class_name = "sbg_demuxer",
+ .item_name = av_default_item_name,
+ .option = sbg_options,
+ .version = LIBAVUTIL_VERSION_INT,
+};
+
+AVInputFormat ff_sbg_demuxer = {
+ .name = "sbg",
+ .long_name = NULL_IF_CONFIG_SMALL("SBaGen binaural beats script"),
+ .priv_data_size = sizeof(struct sbg_demuxer),
+ .read_probe = sbg_read_probe,
+ .read_header = sbg_read_header,
+ .read_packet = sbg_read_packet,
+#if FF_API_READ_SEEK
+ .read_seek = sbg_read_seek,
+#endif
+ .read_seek2 = sbg_read_seek2,
+ .extensions = "sbg",
+ .priv_class = &sbg_demuxer_class,
+};
diff --git a/libavformat/version.h b/libavformat/version.h
index 844cd64..4bd3d86 100644
--- a/libavformat/version.h
+++ b/libavformat/version.h
@@ -24,7 +24,7 @@
#include "libavutil/avutil.h"
#define LIBAVFORMAT_VERSION_MAJOR 53
-#define LIBAVFORMAT_VERSION_MINOR 24
+#define LIBAVFORMAT_VERSION_MINOR 25
#define LIBAVFORMAT_VERSION_MICRO 0
#define LIBAVFORMAT_VERSION_INT AV_VERSION_INT(LIBAVFORMAT_VERSION_MAJOR, \
--
1.7.7.3
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