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bmv audio: implement new audio decoding API

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This commit is contained in:
Justin Ruggles 2011-12-31 15:47:30 -05:00
parent 03fafdec82
commit 8893fbdf7a
1 changed files with 25 additions and 9 deletions
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34
libavcodec/bmv.c
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@ -285,12 +285,17 @@ static av_cold int decode_end(AVCodecContext *avctx)
return 0; return 0;
} }
typedef struct BMVAudioDecContext {
AVFrame frame;
} BMVAudioDecContext;
static const int bmv_aud_mults[16] = { static const int bmv_aud_mults[16] = {
16512, 8256, 4128, 2064, 1032, 516, 258, 192, 129, 88, 64, 56, 48, 40, 36, 32 16512, 8256, 4128, 2064, 1032, 516, 258, 192, 129, 88, 64, 56, 48, 40, 36, 32
}; };
static av_cold int bmv_aud_decode_init(AVCodecContext *avctx) static av_cold int bmv_aud_decode_init(AVCodecContext *avctx)
{ {
BMVAudioDecContext *c = avctx->priv_data;
if (avctx->channels != 2) { if (avctx->channels != 2) {
av_log(avctx, AV_LOG_INFO, "invalid number of channels\n"); av_log(avctx, AV_LOG_INFO, "invalid number of channels\n");
@ -299,17 +304,21 @@ static av_cold int bmv_aud_decode_init(AVCodecContext *avctx)
avctx->sample_fmt = AV_SAMPLE_FMT_S16; avctx->sample_fmt = AV_SAMPLE_FMT_S16;
avcodec_get_frame_defaults(&c->frame);
avctx->coded_frame = &c->frame;
return 0; return 0;
} }
static int bmv_aud_decode_frame(AVCodecContext *avctx, void *data, int *data_size, static int bmv_aud_decode_frame(AVCodecContext *avctx, void *data,
AVPacket *avpkt) int *got_frame_ptr, AVPacket *avpkt)
{ {
BMVAudioDecContext *c = avctx->priv_data;
const uint8_t *buf = avpkt->data; const uint8_t *buf = avpkt->data;
int buf_size = avpkt->size; int buf_size = avpkt->size;
int blocks = 0, total_blocks, i; int blocks = 0, total_blocks, i;
int out_size; int ret;
int16_t *output_samples = data; int16_t *output_samples;
int scale[2]; int scale[2];
total_blocks = *buf++; total_blocks = *buf++;
@ -318,11 +327,14 @@ static int bmv_aud_decode_frame(AVCodecContext *avctx, void *data, int *data_siz
total_blocks * 65 + 1, buf_size); total_blocks * 65 + 1, buf_size);
return AVERROR_INVALIDDATA; return AVERROR_INVALIDDATA;
} }
out_size = total_blocks * 64 * sizeof(*output_samples);
if (*data_size < out_size) { /* get output buffer */
av_log(avctx, AV_LOG_ERROR, "Output buffer is too small\n"); c->frame.nb_samples = total_blocks * 32;
return AVERROR(EINVAL); if ((ret = avctx->get_buffer(avctx, &c->frame)) < 0) {
av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
return ret;
} }
output_samples = (int16_t *)c->frame.data[0];
for (blocks = 0; blocks < total_blocks; blocks++) { for (blocks = 0; blocks < total_blocks; blocks++) {
uint8_t code = *buf++; uint8_t code = *buf++;
@ -335,7 +347,9 @@ static int bmv_aud_decode_frame(AVCodecContext *avctx, void *data, int *data_siz
} }
} }
*data_size = out_size; *got_frame_ptr = 1;
*(AVFrame *)data = c->frame;
return buf_size; return buf_size;
} }
@ -354,7 +368,9 @@ AVCodec ff_bmv_audio_decoder = {
.name = "bmv_audio", .name = "bmv_audio",
.type = AVMEDIA_TYPE_AUDIO, .type = AVMEDIA_TYPE_AUDIO,
.id = CODEC_ID_BMV_AUDIO, .id = CODEC_ID_BMV_AUDIO,
.priv_data_size = sizeof(BMVAudioDecContext),
.init = bmv_aud_decode_init, .init = bmv_aud_decode_init,
.decode = bmv_aud_decode_frame, .decode = bmv_aud_decode_frame,
.capabilities = CODEC_CAP_DR1,
.long_name = NULL_IF_CONFIG_SMALL("Discworld II BMV audio"), .long_name = NULL_IF_CONFIG_SMALL("Discworld II BMV audio"),
}; };