Merge branch 'master' into next

diff --combined alsa_write.c
index b6a087a3d6b87353796dff34ac790d6c64f58e4d,0bb3de38d6a06dd81562a95e518453fd666e4991..456c5178981f201aad9d048ca63079d3133952df
--- 1/alsa_write.c
--- 2/alsa_write.c
+++ b/alsa_write.c
@@@ -29,19 -29,19 +29,19 @@@
  /** always use 16 bit little endian */
  #define FORMAT SND_PCM_FORMAT_S16_LE
  
- /** data specific to the alsa writer */
+ /** Data specific to the alsa writer. */
  struct private_alsa_write_data {
-       /** the alsa handle */
+       /** The alsa handle */
        snd_pcm_t *handle;
-       /** determined and set by alsa_open() */
-       size_t bytes_per_frame;
-       /** don't write anything until this time */
+       /** Determined and set by alsa_open(). */
+       int bytes_per_frame;
+       /** Don't write anything until this time. */
        struct timeval next_chunk;
-       /** the return value of snd_pcm_hw_params_get_buffer_time_max() */
+       /** The approximate maximum buffer duration in us. */
        unsigned buffer_time;
        /**
-        * the samplerate given by command line option or the decoder
-        * of the writer node group
+        * The samplerate given by command line option or the decoder
+        * of the writer node group.
         */
        unsigned samplerate;
        /**
@@@ -101,7 -101,8 +101,8 @@@ static int alsa_init(struct private_als
        if (buffer_size < 1)
                start_threshold = 1;
        else
-               start_threshold = buffer_size;
+               start_threshold = PARA_MIN(buffer_size,
+                       (snd_pcm_uframes_t)pad->samplerate);
        if (snd_pcm_sw_params_set_start_threshold(pad->handle, swparams,
                        start_threshold) < 0)
                return -E_START_THRESHOLD;
@@@ -113,6 -114,8 +114,8 @@@
                PARA_WARNING_LOG("unable to install sw params\n");
        pad->bytes_per_frame = snd_pcm_format_physical_width(FORMAT)
                * pad->channels / 8;
+       if (pad->bytes_per_frame <= 0)
+               return -E_PHYSICAL_WIDTH;
        PARA_INFO_LOG("bytes per frame: %zu\n", pad->bytes_per_frame);
        if (snd_pcm_nonblock(pad->handle, 1))
                PARA_ERROR_LOG("failed to set nonblock mode\n");
@@@ -164,10 -167,14 +167,14 @@@ static int alsa_write_post_select(__a_u
        struct private_alsa_write_data *pad = wn->private_data;
        struct writer_node_group *wng = wn->wng;
        size_t frames, bytes = *wng->loaded - wn->written;
 -      unsigned char *data = (unsigned char*)wng->buf + wn->written;
 +      unsigned char *data = (unsigned char*)*wng->bufp + wn->written;
        struct timeval tv;
        snd_pcm_sframes_t ret;
  
+       if (*wng->input_error < 0 && (!pad->handle || bytes < pad->bytes_per_frame)) {
+               wn->written = *wng->loaded;
+               return *wng->input_error;
+       }
        if (!bytes) /* no data available */
                goto out;
        if (tv_diff(now, &pad->next_chunk, NULL) < 0)
@@@ -178,6 -185,8 +185,8 @@@
                        return err;
        }
        frames = bytes / pad->bytes_per_frame;
+       if (!frames) /* less than a single frame available */
+               goto out;
        ret = snd_pcm_writei(pad->handle, data, frames);
        if (ret == -EPIPE) {
                PARA_WARNING_LOG("EPIPE\n");
@@@ -195,15 -204,11 +204,11 @@@
                wn->written += ret * pad->bytes_per_frame;
        if (ret == frames) /* we wrote everything, try again immediately */
                pad->next_chunk = *now;
-       else {
-               ms2tv(pad->buffer_time / pad->bytes_per_frame / 1000, &tv);
+       else { /* wait until 50% buffer space is available */
+               ms2tv(pad->buffer_time / 2000, &tv);
                tv_add(now, &tv, &pad->next_chunk);
        }
  out:
-       if (*wng->input_error < 0) {
-               wn->written = *wng->loaded;
-               return *wng->input_error;
-       }
        return 1;
  }
  

diff --combined error.h
index ec1ec7b060e5d8180b4671dd96cec7ebb5359157,604152233b003e44667f7b69fc2515c74b26f480..555ca15f0c6e79307f7dafe397c8222630592764
--- 1/error.h
--- 2/error.h
+++ b/error.h
@@@ -29,8 -29,6 +29,8 @@@ DEFINE_ERRLIST_OBJECT_ENUM
  #define HTTP_SEND_ERRORS
  #define GGO_ERRORS
  #define COLOR_ERRORS
 +#define SIGNAL_ERRORS
 +
  
  extern const char **para_errlist[];
  
@@@ -301,6 -299,10 +301,6 @@@
        PARA_ERROR(FILTER_SYNTAX, "syntax error"), \
  
  
 -#define SIGNAL_ERRORS \
 -      PARA_ERROR(SIGNAL_SIG_ERR, "signal() returned SIG_ERR"), \
 -
 -
  #define STRING_ERRORS \
        PARA_ERROR(ATOI_OVERFLOW, "value too large"), \
        PARA_ERROR(STRTOLL, "unknown strtoll error"), \
@@@ -394,7 -396,7 +394,7 @@@
        PARA_ERROR(BAD_PERIOD, "can not use period equal to buffer size"), \
        PARA_ERROR(ALSA_WRITE, "alsa write error"), \
        PARA_ERROR(PCM_OPEN, "unable to open pcm"), \
-       PARA_ERROR(SND_PCM_INFO, "pcm info error"), \
+       PARA_ERROR(PHYSICAL_WIDTH, "unable to determine bytes per frame"), \
        PARA_ERROR(GET_BUFFER_TIME, "snd_pcm_hw_params_get_buffer_time_max() failed"), \
        PARA_ERROR(SET_BUFFER_TIME, "snd_pcm_hw_params_set_buffer_time_near() failed"), \
        PARA_ERROR(SET_RATE, "snd_pcm_hw_params_set_rate_near failed"), \