gui: Make curses_active a bool.
[paraslash.git] / mp3dec_filter.c
1 /*
2 * Copyright (C) 2005-2014 Andre Noll <maan@systemlinux.org>
3 *
4 * Licensed under the GPL v2. For licencing details see COPYING.
5 */
6
7 /** \file mp3dec_filter.c Paraslash's mp3 decoder. */
8
9 #include <mad.h>
10 #include <regex.h>
11
12 #include "para.h"
13 #include "mp3dec_filter.cmdline.h"
14 #include "list.h"
15 #include "sched.h"
16 #include "ggo.h"
17 #include "buffer_tree.h"
18 #include "filter.h"
19 #include "error.h"
20 #include "string.h"
21
22 /** Convert a sample value from libmad to a signed short. */
23 #define MAD_TO_SHORT(f) (f) >= MAD_F_ONE? SHRT_MAX :\
24 (f) <= -MAD_F_ONE? -SHRT_MAX : (signed short) ((f) >> (MAD_F_FRACBITS - 15))
25
26 /** Data specific to the mp3dec filter. */
27 struct private_mp3dec_data {
28 /** Information on the current mp3 stream. */
29 struct mad_stream stream;
30 /** Information about the frame which is currently decoded. */
31 struct mad_frame frame;
32 /** Contains the PCM output. */
33 struct mad_synth synth;
34 /** The number of channels of the current stream. */
35 unsigned int channels;
36 /** Current sample rate in Hz. */
37 unsigned int sample_rate;
38 };
39
40 /* Returns negative on serious errors. */
41 static int handle_decode_error(struct private_mp3dec_data *pmd)
42 {
43 if (!MAD_RECOVERABLE(pmd->stream.error)
44 && pmd->stream.error != MAD_ERROR_BUFLEN) {
45 PARA_ERROR_LOG("%s\n", mad_stream_errorstr(&pmd->stream));
46 return -E_MAD_FRAME_DECODE;
47 }
48 PARA_DEBUG_LOG("%s\n", mad_stream_errorstr(&pmd->stream));
49 return 0;
50 }
51
52 static void mp3dec_consume(struct btr_node *btrn, struct mad_stream *s,
53 size_t max)
54 {
55 size_t used;
56
57 if (!s->next_frame)
58 used = max;
59 else { /* we still have some data */
60 used = s->next_frame - s->buffer;
61 assert(used <= max);
62 }
63 btr_consume(btrn, used);
64 }
65
66 static void mp3dec_close(struct filter_node *fn)
67 {
68 struct private_mp3dec_data *pmd = fn->private_data;
69
70 mad_synth_finish(&pmd->synth);
71 mad_frame_finish(&pmd->frame);
72 mad_stream_finish(&pmd->stream);
73
74 free(pmd);
75 fn->private_data = NULL;
76 }
77
78 #define MP3DEC_MAX_FRAME 8192
79
80 static int mp3dec_post_select(__a_unused struct sched *s, struct task *t)
81 {
82 struct filter_node *fn = container_of(t, struct filter_node, task);
83 int i, ret;
84 struct private_mp3dec_data *pmd = fn->private_data;
85 struct btr_node *btrn = fn->btrn;
86 size_t loaded = 0, len, iqs;
87 char *inbuffer, *outbuffer;
88
89 next_buffer:
90 pmd->stream.error = 0;
91 iqs = btr_get_input_queue_size(btrn);
92 ret = btr_node_status(btrn, fn->min_iqs, BTR_NT_INTERNAL);
93 if (ret < 0)
94 goto err;
95 if (ret == 0)
96 return 0;
97 btr_merge(btrn, fn->min_iqs);
98 len = btr_next_buffer(btrn, &inbuffer);
99 /*
100 * Decode at most 8K in one go to give the post_select() functions of
101 * other buffer tree nodes a chance to run. This is necessary to avoid
102 * buffer underruns on slow machines.
103 */
104 len = PARA_MIN(len, (size_t)MP3DEC_MAX_FRAME);
105 mad_stream_buffer(&pmd->stream, (unsigned char *)inbuffer, len);
106 next_frame:
107 ret = mad_header_decode(&pmd->frame.header, &pmd->stream);
108 if (ret < 0) {
109 mp3dec_consume(btrn, &pmd->stream, len);
110 if (pmd->stream.error == MAD_ERROR_BUFLEN) {
111 if (len == iqs && btr_no_parent(btrn)) {
112 ret = -E_MP3DEC_EOF;
113 goto err;
114 }
115 fn->min_iqs += 100;
116 ret = -E_MP3DEC_CORRUPT;
117 if (fn->min_iqs > MP3DEC_MAX_FRAME)
118 goto err;
119 }
120 if (loaded == 0)
121 goto next_buffer;
122 return 0;
123 }
124 pmd->sample_rate = pmd->frame.header.samplerate;
125 pmd->channels = MAD_NCHANNELS(&pmd->frame.header);
126 decode:
127 ret = mad_frame_decode(&pmd->frame, &pmd->stream);
128 if (ret != 0) {
129 ret = handle_decode_error(pmd);
130 if (ret < 0)
131 goto err;
132 mad_stream_sync(&pmd->stream);
133 if (pmd->stream.error == MAD_ERROR_BUFLEN) {
134 ret = -E_MP3DEC_EOF;
135 if (len == iqs && btr_no_parent(btrn))
136 goto err;
137 fn->min_iqs += 100;
138 ret = -E_MP3DEC_CORRUPT;
139 if (fn->min_iqs > MP3DEC_MAX_FRAME)
140 goto err;
141 mp3dec_consume(btrn, &pmd->stream, len);
142 return 0;
143 }
144 if (pmd->stream.error != MAD_ERROR_BADDATAPTR)
145 goto decode;
146 mp3dec_consume(btrn, &pmd->stream, len);
147 return 0;
148 }
149 fn->min_iqs = 0;
150 mad_synth_frame(&pmd->synth, &pmd->frame);
151 outbuffer = para_malloc(pmd->synth.pcm.length * 2 * pmd->channels);
152 loaded = 0;
153 for (i = 0; i < pmd->synth.pcm.length; i++) {
154 int sample = MAD_TO_SHORT(pmd->synth.pcm.samples[0][i]);
155 write_int16_host_endian(outbuffer + loaded, sample);
156 loaded += 2;
157 if (pmd->channels == 2) { /* stereo */
158 sample = MAD_TO_SHORT(pmd->synth.pcm.samples[1][i]);
159 write_int16_host_endian(outbuffer + loaded, sample);
160 loaded += 2;
161 }
162 }
163 btr_add_output(outbuffer, loaded, btrn);
164 goto next_frame;
165 err:
166 assert(ret < 0);
167 btr_remove_node(&fn->btrn);
168 return ret;
169 }
170
171 static void mp3dec_open(struct filter_node *fn)
172 {
173 struct private_mp3dec_data *pmd = para_calloc(sizeof(*pmd));
174 struct mp3dec_filter_args_info *mp3_conf = fn->conf;
175
176 fn->private_data = pmd;
177 mad_stream_init(&pmd->stream);
178 mad_frame_init(&pmd->frame);
179 mad_synth_init(&pmd->synth);
180 if (mp3_conf->ignore_crc_given)
181 mad_stream_options(&pmd->stream, MAD_OPTION_IGNORECRC);
182 }
183
184 static int mp3dec_parse_config(int argc, char **argv, void **config)
185 {
186 struct mp3dec_filter_args_info *conf = para_calloc(sizeof(*conf));
187
188 mp3dec_filter_cmdline_parser(argc, argv, conf);
189 *config = conf;
190 return 1;
191 }
192
193 static int mp3dec_execute(struct btr_node *btrn, const char *cmd, char **result)
194 {
195 struct filter_node *fn = btr_context(btrn);
196 struct private_mp3dec_data *pmd = fn->private_data;
197
198 return decoder_execute(cmd, pmd->sample_rate, pmd->channels, result);
199 }
200
201 static void mp3dec_free_config(void *conf)
202 {
203 mp3dec_filter_cmdline_parser_free(conf);
204 }
205 /**
206 * The init function of the mp3dec filter.
207 *
208 * \param f Pointer to the filter struct to initialize.
209 *
210 * \sa filter::init.
211 */
212 void mp3dec_filter_init(struct filter *f)
213 {
214 struct mp3dec_filter_args_info dummy;
215
216 mp3dec_filter_cmdline_parser_init(&dummy);
217 f->open = mp3dec_open;
218 f->close = mp3dec_close;
219 f->parse_config = mp3dec_parse_config;
220 f->free_config = mp3dec_free_config;
221 f->pre_select = generic_filter_pre_select;
222 f->post_select = mp3dec_post_select;
223 f->execute = mp3dec_execute;
224 f->help = (struct ggo_help)DEFINE_GGO_HELP(mp3dec_filter);
225 }