From e00959a9b176f6ad19853b75796dbc12ea264a78 Mon Sep 17 00:00:00 2001 From: Justin Ruggles Date: Fri, 17 Feb 2012 01:50:57 -0500 Subject: libmp3lame: support float and s32 sample formats --- libavcodec/libmp3lame.c | 95 +++++++++++++++++++++++++++++++++++++++++++------ 1 file changed, 84 insertions(+), 11 deletions(-) (limited to 'libavcodec/libmp3lame.c') diff --git a/libavcodec/libmp3lame.c b/libavcodec/libmp3lame.c index 365b6395f8..d9f8120411 100644 --- a/libavcodec/libmp3lame.c +++ b/libavcodec/libmp3lame.c @@ -38,10 +38,12 @@ typedef struct LAMEContext { AVClass *class; + AVCodecContext *avctx; lame_global_flags *gfp; uint8_t buffer[BUFFER_SIZE]; int buffer_index; int reservoir; + void *planar_samples[2]; } LAMEContext; @@ -50,6 +52,8 @@ static av_cold int mp3lame_encode_close(AVCodecContext *avctx) LAMEContext *s = avctx->priv_data; av_freep(&avctx->coded_frame); + av_freep(&s->planar_samples[0]); + av_freep(&s->planar_samples[1]); lame_close(s->gfp); return 0; @@ -60,6 +64,8 @@ static av_cold int mp3lame_encode_init(AVCodecContext *avctx) LAMEContext *s = avctx->priv_data; int ret; + s->avctx = avctx; + /* initialize LAME and get defaults */ if ((s->gfp = lame_init()) == NULL) return AVERROR(ENOMEM); @@ -110,12 +116,75 @@ static av_cold int mp3lame_encode_init(AVCodecContext *avctx) goto error; } + /* sample format */ + if (avctx->sample_fmt == AV_SAMPLE_FMT_S32 || + avctx->sample_fmt == AV_SAMPLE_FMT_FLT) { + int ch; + for (ch = 0; ch < avctx->channels; ch++) { + s->planar_samples[ch] = av_malloc(avctx->frame_size * + av_get_bytes_per_sample(avctx->sample_fmt)); + if (!s->planar_samples[ch]) { + ret = AVERROR(ENOMEM); + goto error; + } + } + } + return 0; error: mp3lame_encode_close(avctx); return ret; } +#define DEINTERLEAVE(type, scale) do { \ + int ch, i; \ + for (ch = 0; ch < s->avctx->channels; ch++) { \ + const type *input = samples; \ + type *output = s->planar_samples[ch]; \ + input += ch; \ + for (i = 0; i < s->avctx->frame_size; i++) { \ + output[i] = *input * scale; \ + input += s->avctx->channels; \ + } \ + } \ +} while (0) + +static int encode_frame_int16(LAMEContext *s, void *samples) +{ + if (s->avctx->channels > 1) { + return lame_encode_buffer_interleaved(s->gfp, samples, + s->avctx->frame_size, + s->buffer + s->buffer_index, + BUFFER_SIZE - s->buffer_index); + } else { + return lame_encode_buffer(s->gfp, samples, NULL, s->avctx->frame_size, + s->buffer + s->buffer_index, + BUFFER_SIZE - s->buffer_index); + } +} + +static int encode_frame_int32(LAMEContext *s, void *samples) +{ + DEINTERLEAVE(int32_t, 1); + + return lame_encode_buffer_int(s->gfp, + s->planar_samples[0], s->planar_samples[1], + s->avctx->frame_size, + s->buffer + s->buffer_index, + BUFFER_SIZE - s->buffer_index); +} + +static int encode_frame_float(LAMEContext *s, void *samples) +{ + DEINTERLEAVE(float, 32768.0f); + + return lame_encode_buffer_float(s->gfp, + s->planar_samples[0], s->planar_samples[1], + s->avctx->frame_size, + s->buffer + s->buffer_index, + BUFFER_SIZE - s->buffer_index); +} + static int mp3lame_encode_frame(AVCodecContext *avctx, unsigned char *frame, int buf_size, void *data) { @@ -125,16 +194,18 @@ static int mp3lame_encode_frame(AVCodecContext *avctx, unsigned char *frame, int lame_result; if (data) { - if (avctx->channels > 1) { - lame_result = lame_encode_buffer_interleaved(s->gfp, data, - avctx->frame_size, - s->buffer + s->buffer_index, - BUFFER_SIZE - s->buffer_index); - } else { - lame_result = lame_encode_buffer(s->gfp, data, data, - avctx->frame_size, s->buffer + - s->buffer_index, BUFFER_SIZE - - s->buffer_index); + switch (avctx->sample_fmt) { + case AV_SAMPLE_FMT_S16: + lame_result = encode_frame_int16(s, data); + break; + case AV_SAMPLE_FMT_S32: + lame_result = encode_frame_int32(s, data); + break; + case AV_SAMPLE_FMT_FLT: + lame_result = encode_frame_float(s, data); + break; + default: + return AVERROR_BUG; } } else { lame_result = lame_encode_flush(s->gfp, s->buffer + s->buffer_index, @@ -203,7 +274,9 @@ AVCodec ff_libmp3lame_encoder = { .encode = mp3lame_encode_frame, .close = mp3lame_encode_close, .capabilities = CODEC_CAP_DELAY, - .sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_S16, + .sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_S32, + AV_SAMPLE_FMT_FLT, + AV_SAMPLE_FMT_S16, AV_SAMPLE_FMT_NONE }, .supported_samplerates = libmp3lame_sample_rates, .long_name = NULL_IF_CONFIG_SMALL("libmp3lame MP3 (MPEG audio layer 3)"), -- cgit v1.2.3