diff options
author | Justin Ruggles <justin.ruggles@gmail.com> | 2012-12-19 23:58:57 +0400 |
---|---|---|
committer | Justin Ruggles <justin.ruggles@gmail.com> | 2013-01-08 06:49:06 +0400 |
commit | 074a00d192c0e749d677b008b337da42597e780f (patch) | |
tree | 3f828927503dfef5df7eee5c974ffab75f2407be /libavresample/utils.c | |
parent | 4d68269d58ca4f6f71b4baa30e0cf9fbde52bbc3 (diff) |
lavr: add a public function for setting a custom channel map
This allows reordering, duplication, and silencing of input channels.
Diffstat (limited to 'libavresample/utils.c')
-rw-r--r-- | libavresample/utils.c | 156 |
1 files changed, 146 insertions, 10 deletions
diff --git a/libavresample/utils.c b/libavresample/utils.c index a30388092e..b79def9285 100644 --- a/libavresample/utils.c +++ b/libavresample/utils.c @@ -96,20 +96,84 @@ int avresample_open(AVAudioResampleContext *avr) av_get_sample_fmt_name(avr->internal_sample_fmt)); } - /* set sample format conversion parameters */ + /* treat all mono as planar for easier comparison */ if (avr->in_channels == 1) avr->in_sample_fmt = av_get_planar_sample_fmt(avr->in_sample_fmt); if (avr->out_channels == 1) avr->out_sample_fmt = av_get_planar_sample_fmt(avr->out_sample_fmt); - avr->in_convert_needed = (avr->resample_needed || avr->mixing_needed) && - avr->in_sample_fmt != avr->internal_sample_fmt; + + /* we may need to add an extra conversion in order to remap channels if + the output format is not planar */ + if (avr->use_channel_map && !avr->mixing_needed && !avr->resample_needed && + !av_sample_fmt_is_planar(avr->out_sample_fmt)) { + avr->internal_sample_fmt = av_get_planar_sample_fmt(avr->out_sample_fmt); + } + + /* set sample format conversion parameters */ if (avr->resample_needed || avr->mixing_needed) + avr->in_convert_needed = avr->in_sample_fmt != avr->internal_sample_fmt; + else + avr->in_convert_needed = avr->use_channel_map && + !av_sample_fmt_is_planar(avr->out_sample_fmt); + + if (avr->resample_needed || avr->mixing_needed || avr->in_convert_needed) avr->out_convert_needed = avr->internal_sample_fmt != avr->out_sample_fmt; else avr->out_convert_needed = avr->in_sample_fmt != avr->out_sample_fmt; + avr->in_copy_needed = !avr->in_convert_needed && (avr->mixing_needed || + (avr->use_channel_map && avr->resample_needed)); + + if (avr->use_channel_map) { + if (avr->in_copy_needed) { + avr->remap_point = REMAP_IN_COPY; + av_dlog(avr, "remap channels during in_copy\n"); + } else if (avr->in_convert_needed) { + avr->remap_point = REMAP_IN_CONVERT; + av_dlog(avr, "remap channels during in_convert\n"); + } else if (avr->out_convert_needed) { + avr->remap_point = REMAP_OUT_CONVERT; + av_dlog(avr, "remap channels during out_convert\n"); + } else { + avr->remap_point = REMAP_OUT_COPY; + av_dlog(avr, "remap channels during out_copy\n"); + } + +#ifdef DEBUG + { + int ch; + av_dlog(avr, "output map: "); + if (avr->ch_map_info.do_remap) + for (ch = 0; ch < avr->in_channels; ch++) + av_dlog(avr, " % 2d", avr->ch_map_info.channel_map[ch]); + else + av_dlog(avr, "n/a"); + av_dlog(avr, "\n"); + av_dlog(avr, "copy map: "); + if (avr->ch_map_info.do_copy) + for (ch = 0; ch < avr->in_channels; ch++) + av_dlog(avr, " % 2d", avr->ch_map_info.channel_copy[ch]); + else + av_dlog(avr, "n/a"); + av_dlog(avr, "\n"); + av_dlog(avr, "zero map: "); + if (avr->ch_map_info.do_zero) + for (ch = 0; ch < avr->in_channels; ch++) + av_dlog(avr, " % 2d", avr->ch_map_info.channel_zero[ch]); + else + av_dlog(avr, "n/a"); + av_dlog(avr, "\n"); + av_dlog(avr, "input map: "); + for (ch = 0; ch < avr->in_channels; ch++) + av_dlog(avr, " % 2d", avr->ch_map_info.input_map[ch]); + av_dlog(avr, "\n"); + } +#endif + } else + avr->remap_point = REMAP_NONE; + /* allocate buffers */ - if (avr->mixing_needed || avr->in_convert_needed) { + if (avr->in_copy_needed || avr->in_convert_needed) { avr->in_buffer = ff_audio_data_alloc(FFMAX(avr->in_channels, avr->out_channels), 0, avr->internal_sample_fmt, "in_buffer"); @@ -146,7 +210,8 @@ int avresample_open(AVAudioResampleContext *avr) if (avr->in_convert_needed) { avr->ac_in = ff_audio_convert_alloc(avr, avr->internal_sample_fmt, avr->in_sample_fmt, avr->in_channels, - avr->in_sample_rate); + avr->in_sample_rate, + avr->remap_point == REMAP_IN_CONVERT); if (!avr->ac_in) { ret = AVERROR(ENOMEM); goto error; @@ -160,7 +225,8 @@ int avresample_open(AVAudioResampleContext *avr) src_fmt = avr->in_sample_fmt; avr->ac_out = ff_audio_convert_alloc(avr, avr->out_sample_fmt, src_fmt, avr->out_channels, - avr->out_sample_rate); + avr->out_sample_rate, + avr->remap_point == REMAP_OUT_CONVERT); if (!avr->ac_out) { ret = AVERROR(ENOMEM); goto error; @@ -200,6 +266,8 @@ void avresample_close(AVAudioResampleContext *avr) ff_audio_resample_free(&avr->resample); ff_audio_mix_free(&avr->am); av_freep(&avr->mix_matrix); + + avr->use_channel_map = 0; } void avresample_free(AVAudioResampleContext **avr) @@ -242,7 +310,9 @@ static int handle_buffered_output(AVAudioResampleContext *avr, data in the output FIFO */ av_dlog(avr, "[copy] %s to output\n", converted->name); output->nb_samples = 0; - ret = ff_audio_data_copy(output, converted); + ret = ff_audio_data_copy(output, converted, + avr->remap_point == REMAP_OUT_COPY ? + &avr->ch_map_info : NULL); if (ret < 0) return ret; av_dlog(avr, "[end conversion]\n"); @@ -306,11 +376,24 @@ int attribute_align_arg avresample_convert(AVAudioResampleContext *avr, /* in some rare cases we can copy input to output and upmix directly in the output buffer */ av_dlog(avr, "[copy] %s to output\n", current_buffer->name); - ret = ff_audio_data_copy(&output_buffer, current_buffer); + ret = ff_audio_data_copy(&output_buffer, current_buffer, + avr->remap_point == REMAP_OUT_COPY ? + &avr->ch_map_info : NULL); if (ret < 0) return ret; current_buffer = &output_buffer; - } else if (avr->mixing_needed || avr->in_convert_needed) { + } else if (avr->remap_point == REMAP_OUT_COPY && + (!direct_output || out_samples < in_samples)) { + /* if remapping channels during output copy, we may need to + * use an intermediate buffer in order to remap before adding + * samples to the output fifo */ + av_dlog(avr, "[copy] %s to out_buffer\n", current_buffer->name); + ret = ff_audio_data_copy(avr->out_buffer, current_buffer, + &avr->ch_map_info); + if (ret < 0) + return ret; + current_buffer = avr->out_buffer; + } else if (avr->in_copy_needed || avr->in_convert_needed) { /* if needed, copy or convert input to in_buffer, and downmix if applicable */ if (avr->in_convert_needed) { @@ -325,7 +408,9 @@ int attribute_align_arg avresample_convert(AVAudioResampleContext *avr, return ret; } else { av_dlog(avr, "[copy] %s to in_buffer\n", current_buffer->name); - ret = ff_audio_data_copy(avr->in_buffer, current_buffer); + ret = ff_audio_data_copy(avr->in_buffer, current_buffer, + avr->remap_point == REMAP_IN_COPY ? + &avr->ch_map_info : NULL); if (ret < 0) return ret; } @@ -470,6 +555,57 @@ int avresample_set_matrix(AVAudioResampleContext *avr, const double *matrix, return 0; } +int avresample_set_channel_mapping(AVAudioResampleContext *avr, + const int *channel_map) +{ + ChannelMapInfo *info = &avr->ch_map_info; + int in_channels, ch, i; + + in_channels = av_get_channel_layout_nb_channels(avr->in_channel_layout); + if (in_channels <= 0 || in_channels > AVRESAMPLE_MAX_CHANNELS) { + av_log(avr, AV_LOG_ERROR, "Invalid input channel layout\n"); + return AVERROR(EINVAL); + } + + memset(info, 0, sizeof(*info)); + memset(info->input_map, -1, sizeof(info->input_map)); + + for (ch = 0; ch < in_channels; ch++) { + if (channel_map[ch] >= in_channels) { + av_log(avr, AV_LOG_ERROR, "Invalid channel map\n"); + return AVERROR(EINVAL); + } + if (channel_map[ch] < 0) { + info->channel_zero[ch] = 1; + info->channel_map[ch] = -1; + info->do_zero = 1; + } else if (info->input_map[channel_map[ch]] >= 0) { + info->channel_copy[ch] = info->input_map[channel_map[ch]]; + info->channel_map[ch] = -1; + info->do_copy = 1; + } else { + info->channel_map[ch] = channel_map[ch]; + info->input_map[channel_map[ch]] = ch; + info->do_remap = 1; + } + } + /* Fill-in unmapped input channels with unmapped output channels. + This is used when remapping during conversion from interleaved to + planar format. */ + for (ch = 0, i = 0; ch < in_channels && i < in_channels; ch++, i++) { + while (ch < in_channels && info->input_map[ch] >= 0) + ch++; + while (i < in_channels && info->channel_map[i] >= 0) + i++; + if (ch >= in_channels || i >= in_channels) + break; + info->input_map[ch] = i; + } + + avr->use_channel_map = 1; + return 0; +} + int avresample_available(AVAudioResampleContext *avr) { return av_audio_fifo_size(avr->out_fifo); |