diff options
Diffstat (limited to 'src/pcm_convert.c')
| -rw-r--r-- | src/pcm_convert.c | 136 |
1 files changed, 134 insertions, 2 deletions
diff --git a/src/pcm_convert.c b/src/pcm_convert.c index 7bd4d7215..daf1cd234 100644 --- a/src/pcm_convert.c +++ b/src/pcm_convert.c @@ -1,5 +1,5 @@ /* - * Copyright (C) 2003-2010 The Music Player Daemon Project + * Copyright (C) 2003-2011 The Music Player Daemon Project * http://www.musicpd.org * * This program is free software; you can redistribute it and/or modify @@ -24,6 +24,7 @@ #include "pcm_byteswap.h" #include "pcm_pack.h" #include "audio_format.h" +#include "glib_compat.h" #include <assert.h> #include <string.h> @@ -56,6 +57,55 @@ void pcm_convert_deinit(struct pcm_convert_state *state) pcm_buffer_deinit(&state->byteswap_buffer); } +static const void * +pcm_convert_channels(struct pcm_buffer *buffer, enum sample_format format, + uint8_t dest_channels, + uint8_t src_channels, const void *src, + size_t src_size, size_t *dest_size_r, + GError **error_r) +{ + const void *dest = NULL; + + switch (format) { + case SAMPLE_FORMAT_UNDEFINED: + case SAMPLE_FORMAT_S8: + case SAMPLE_FORMAT_S24: + case SAMPLE_FORMAT_FLOAT: + g_set_error(error_r, pcm_convert_quark(), 0, + "Channel conversion not implemented for format '%s'", + sample_format_to_string(format)); + return NULL; + + case SAMPLE_FORMAT_S16: + dest = pcm_convert_channels_16(buffer, dest_channels, + src_channels, src, + src_size, dest_size_r); + break; + + case SAMPLE_FORMAT_S24_P32: + dest = pcm_convert_channels_24(buffer, dest_channels, + src_channels, src, + src_size, dest_size_r); + break; + + case SAMPLE_FORMAT_S32: + dest = pcm_convert_channels_32(buffer, dest_channels, + src_channels, src, + src_size, dest_size_r); + break; + } + + if (dest == NULL) { + g_set_error(error_r, pcm_convert_quark(), 0, + "Conversion from %u to %u channels " + "is not implemented", + src_channels, dest_channels); + return NULL; + } + + return dest; +} + static const int16_t * pcm_convert_16(struct pcm_convert_state *state, const struct audio_format *src_format, @@ -200,7 +250,8 @@ pcm_convert_24_packed(struct pcm_convert_state *state, size_t dest_size = num_samples * 3; uint8_t *dest = pcm_buffer_get(&state->pack_buffer, dest_size); - pcm_pack_24(dest, buffer, num_samples, dest_format->reverse_endian); + pcm_pack_24(dest, buffer, buffer + num_samples, + dest_format->reverse_endian); *dest_size_r = dest_size; return dest; @@ -261,6 +312,67 @@ pcm_convert_32(struct pcm_convert_state *state, return buf; } +static const float * +pcm_convert_float(struct pcm_convert_state *state, + const struct audio_format *src_format, + const void *src_buffer, size_t src_size, + const struct audio_format *dest_format, size_t *dest_size_r, + GError **error_r) +{ + const float *buffer = src_buffer; + size_t size = src_size; + + assert(dest_format->format == SAMPLE_FORMAT_FLOAT); + + if (src_format->reverse_endian || dest_format->reverse_endian) { + g_set_error_literal(error_r, pcm_convert_quark(), 0, + "Reverse endian not supported"); + return NULL; + } + + /* convert channels first, hoping the source format is + supported (float is not) */ + + if (dest_format->channels != src_format->channels) { + buffer = pcm_convert_channels(&state->channels_buffer, + src_format->format, + dest_format->channels, + src_format->channels, + buffer, size, &size, error_r); + if (buffer == NULL) + return NULL; + } + + /* convert to float now */ + + buffer = pcm_convert_to_float(&state->format_buffer, + src_format->format, + buffer, size, &size); + if (buffer == NULL) { + g_set_error(error_r, pcm_convert_quark(), 0, + "Conversion from %s to float is not implemented", + sample_format_to_string(src_format->format)); + return NULL; + } + + /* resample with float, because this is the best format for + libsamplerate */ + + if (src_format->sample_rate != dest_format->sample_rate) { + buffer = pcm_resample_float(&state->resample, + dest_format->channels, + src_format->sample_rate, + buffer, size, + dest_format->sample_rate, &size, + error_r); + if (buffer == NULL) + return NULL; + } + + *dest_size_r = size; + return buffer; +} + const void * pcm_convert(struct pcm_convert_state *state, const struct audio_format *src_format, @@ -269,6 +381,20 @@ pcm_convert(struct pcm_convert_state *state, size_t *dest_size_r, GError **error_r) { + if (src_format->reverse_endian) { + /* convert to host byte order, because all of our + conversion libraries assume host byte order */ + + src = pcm_byteswap(&state->byteswap_buffer, src_format->format, + src, src_size); + if (src == NULL) { + g_set_error(error_r, pcm_convert_quark(), 0, + "PCM byte order change of format '%s' is not implemented", + sample_format_to_string(src_format->format)); + return NULL; + } + } + switch (dest_format->format) { case SAMPLE_FORMAT_S16: return pcm_convert_16(state, @@ -294,6 +420,12 @@ pcm_convert(struct pcm_convert_state *state, dest_format, dest_size_r, error_r); + case SAMPLE_FORMAT_FLOAT: + return pcm_convert_float(state, + src_format, src, src_size, + dest_format, dest_size_r, + error_r); + default: g_set_error(error_r, pcm_convert_quark(), 0, "PCM conversion to %s is not implemented", |