#include <mad.h>
#include <regex.h>
+#include <stdbool.h>
#include "para.h"
#include "mp3dec_filter.cmdline.h"
#include "list.h"
#include "sched.h"
#include "ggo.h"
+#include "buffer_tree.h"
#include "filter.h"
#include "error.h"
#include "string.h"
MP3DEC_FLAG_BAD_DATA = 1,
/** Some output has already been produced. */
MP3DEC_FLAG_DECODE_STARTED = 2,
+ MP3DEC_FLAG_NEED_MORE = 4,
};
/** Data specific to the mp3dec filter. */
struct timeval stream_start_barrier;
/** Wait until this many input bytes are available. */
size_t input_len_barrier;
+ /** The number of channels of the current stream. */
+ unsigned int channels;
+ /** Current sample rate in Hz. */
+ unsigned int samplerate;
};
static int need_bad_data_delay(struct private_mp3dec_data *pmd,
*/
static int handle_decode_error(struct private_mp3dec_data *pmd, size_t len)
{
+ const struct timeval delay = {0, 60 * 1000};
if (!MAD_RECOVERABLE(pmd->stream.error)
&& pmd->stream.error != MAD_ERROR_BUFLEN) {
PARA_ERROR_LOG("%s\n", mad_stream_errorstr(&pmd->stream));
*/
pmd->flags |= MP3DEC_FLAG_BAD_DATA;
pmd->input_len_barrier = len;
- tv_add(now, &(struct timeval){0, 60 * 1000},
- &pmd->stream_start_barrier);
+ tv_add(now, &delay, &pmd->stream_start_barrier);
return 1;
}
+/** 640K ought to be enough for everybody ;) */
+#define MP3DEC_MAX_PENDING (640 * 1024)
+
+static void mp3dec_pre_select(struct sched *s, struct task *t)
+{
+ struct filter_node *fn = container_of(t, struct filter_node, task);
+ size_t iqs = btr_get_input_queue_size(fn->btrn);
+ struct private_mp3dec_data *pmd = fn->private_data;
+
+ t->error = 0;
+ if (iqs <= pmd->input_len_barrier)
+ return;
+ if (btr_bytes_pending(fn->btrn) > MP3DEC_MAX_PENDING)
+ return; /* FIXME, should use reasonable bound on timeout */
+ s->timeout.tv_sec = 0;
+ s->timeout.tv_usec = 1;
+}
+
static ssize_t mp3dec(char *inbuffer, size_t len, struct filter_node *fn)
{
int i, ret;
return copy;
}
+static size_t used_mad_buffer_bytes(struct mad_stream *s, size_t max)
+{
+ size_t rv;
+
+ if (!s->next_frame)
+ return max;
+ /* we still have some data */
+ rv = s->next_frame - s->buffer;
+ assert(rv <= max);
+ return rv;
+}
+
static void mp3dec_close(struct filter_node *fn)
{
struct private_mp3dec_data *pmd = fn->private_data;
fn->private_data = NULL;
}
+static void mp3dec_post_select(__a_unused struct sched *s, struct task *t)
+{
+ struct filter_node *fn = container_of(t, struct filter_node, task);
+ int i, ret;
+ struct private_mp3dec_data *pmd = fn->private_data;
+ struct btr_node *btrn = fn->btrn;
+ size_t loaded, used, len = btr_get_input_queue_size(btrn);
+ char *inbuffer, *outbuffer;
+
+ pmd->stream.error = 0;
+ t->error = 0;
+ if (btr_bytes_pending(btrn) > MP3DEC_MAX_PENDING)
+ return;
+ if (need_bad_data_delay(pmd, len))
+ return;
+ if (len <= pmd->input_len_barrier && btr_no_parent(btrn)) {
+ ret = -E_MP3DEC_EOF;
+ goto err;
+ }
+next_buffer:
+ len = btr_next_buffer(btrn, &inbuffer);
+ if (len == 0)
+ return;
+ mad_stream_buffer(&pmd->stream, (unsigned char *)inbuffer, len);
+next_frame:
+ ret = mad_header_decode(&pmd->frame.header, &pmd->stream);
+ if (ret < 0) {
+ used = used_mad_buffer_bytes(&pmd->stream, len);
+ btr_consume(btrn, used);
+ if (pmd->stream.error == MAD_ERROR_BUFLEN) {
+ pmd->input_len_barrier = len - used;
+ ret = btr_merge(btrn);
+ if (ret != 2)
+ return;
+ } else if (pmd->stream.error != MAD_ERROR_LOSTSYNC)
+ PARA_DEBUG_LOG("header decode: %s\n",
+ mad_stream_errorstr(&pmd->stream));
+ goto next_buffer;
+ }
+ pmd->input_len_barrier = 0;
+ pmd->samplerate = pmd->frame.header.samplerate;
+ pmd->channels = MAD_NCHANNELS(&pmd->frame.header);
+ ret = mad_frame_decode(&pmd->frame, &pmd->stream);
+ if (ret != 0) {
+ PARA_CRIT_LOG("frame decode: %d\n", ret);
+ used = used_mad_buffer_bytes(&pmd->stream, len);
+ ret = handle_decode_error(pmd, used);
+ btr_consume(btrn, used);
+ if (ret < 0)
+ goto err;
+ if (ret == 0)
+ goto next_buffer;
+ return;
+ }
+ mad_synth_frame(&pmd->synth, &pmd->frame);
+ pmd->flags |= MP3DEC_FLAG_DECODE_STARTED;
+
+ outbuffer = para_malloc(pmd->synth.pcm.length * 4);
+ loaded = 0;
+ for (i = 0; i < pmd->synth.pcm.length; i++) {
+ int sample = MAD_TO_SHORT(pmd->synth.pcm.samples[0][i]);
+ write_int16_host_endian(outbuffer + loaded, sample);
+ loaded += 2;
+ if (MAD_NCHANNELS(&pmd->frame.header) == 2) { /* stereo */
+ sample = MAD_TO_SHORT(pmd->synth.pcm.samples[1][i]);
+ write_int16_host_endian(outbuffer + loaded, sample);
+ loaded += 2;
+ }
+ }
+ btr_add_output(outbuffer, loaded, btrn);
+ goto next_frame;
+err:
+ assert(ret < 0);
+ mp3dec_close(fn);
+ t->error = ret;
+ btr_del_node(btrn);
+}
+
static void mp3dec_open(struct filter_node *fn)
{
struct private_mp3dec_data *pmd = para_calloc(sizeof(*pmd));
return ret;
}
+static int mp3dec_execute(struct btr_node *btrn, const char *cmd, char **result)
+{
+ struct filter_node *fn = btr_context(btrn);
+ struct private_mp3dec_data *pmd = fn->private_data;
+
+ if (!strcmp(cmd, "samplerate")) {
+ if (pmd->samplerate == 0)
+ return -ERRNO_TO_PARA_ERROR(ENAVAIL);
+ *result = make_message("%u", pmd->samplerate);
+ return 1;
+ }
+ if (!strcmp(cmd, "channels")) {
+ if (pmd->channels == 0)
+ return -ERRNO_TO_PARA_ERROR(ENAVAIL);
+ *result = make_message("%u", pmd->channels);
+ return 1;
+ }
+ return -ERRNO_TO_PARA_ERROR(ENOTSUP);
+}
/**
* The init function of the mp3dec filter.
*
f->convert = mp3dec;
f->close = mp3dec_close;
f->parse_config = mp3dec_parse_config;
+ f->pre_select = mp3dec_pre_select;
+ f->post_select = mp3dec_post_select;
+ f->execute = mp3dec_execute;
f->help = (struct ggo_help) {
.short_help = mp3dec_filter_args_info_help,
.detailed_help = mp3dec_filter_args_info_detailed_help