From c6061443f766b31b6601c36a832760ebd917c8ad Mon Sep 17 00:00:00 2001 From: Kostya Shishkov Date: Sat, 2 Jun 2012 21:07:02 +0200 Subject: Indeo Audio decoder --- libavcodec/imc.c | 72 ++++++++++++++++++++++++++++++++++++++++++++++---------- 1 file changed, 59 insertions(+), 13 deletions(-) (limited to 'libavcodec/imc.c') diff --git a/libavcodec/imc.c b/libavcodec/imc.c index 4b8ad7c536..3856f4a851 100644 --- a/libavcodec/imc.c +++ b/libavcodec/imc.c @@ -79,7 +79,7 @@ typedef struct IMCChannel { typedef struct { AVFrame frame; - IMCChannel chctx[1]; + IMCChannel chctx[2]; /** MDCT tables */ //@{ @@ -98,6 +98,9 @@ typedef struct { FFTContext fft; DECLARE_ALIGNED(32, FFTComplex, samples)[COEFFS / 2]; float *out_samples; + + int8_t cyclTab[32], cyclTab2[32]; + float weights1[31], weights2[31]; } IMCContext; static VLC huffman_vlc[4][4]; @@ -117,7 +120,8 @@ static av_cold int imc_decode_init(AVCodecContext *avctx) IMCContext *q = avctx->priv_data; double r1, r2; - if (avctx->channels != 1) { + if ((avctx->codec_id == CODEC_ID_IMC && avctx->channels != 1) + || (avctx->codec_id == CODEC_ID_IAC && avctx->channels > 2)) { av_log_ask_for_sample(avctx, "Number of channels is not supported\n"); return AVERROR_PATCHWELCOME; } @@ -169,6 +173,18 @@ static av_cold int imc_decode_init(AVCodecContext *avctx) } q->one_div_log2 = 1 / log(2); + memcpy(q->cyclTab, cyclTab, sizeof(cyclTab)); + memcpy(q->cyclTab2, cyclTab2, sizeof(cyclTab2)); + if (avctx->codec_id == CODEC_ID_IAC) { + q->cyclTab[29] = 31; + q->cyclTab2[31] = 28; + memcpy(q->weights1, iac_weights1, sizeof(iac_weights1)); + memcpy(q->weights2, iac_weights2, sizeof(iac_weights2)); + } else { + memcpy(q->weights1, imc_weights1, sizeof(imc_weights1)); + memcpy(q->weights2, imc_weights2, sizeof(imc_weights2)); + } + if ((ret = ff_fft_init(&q->fft, 7, 1))) { av_log(avctx, AV_LOG_INFO, "FFT init failed\n"); return ret; @@ -210,13 +226,13 @@ static void imc_calculate_coeffs(IMCContext *q, float *flcoeffs1, } for (i = 0; i < BANDS; i++) { - for (cnt2 = i; cnt2 < cyclTab[i]; cnt2++) + for (cnt2 = i; cnt2 < q->cyclTab[i]; cnt2++) flcoeffs5[cnt2] = flcoeffs5[cnt2] + workT3[i]; workT2[cnt2 - 1] = workT2[cnt2 - 1] + workT3[i]; } for (i = 1; i < BANDS; i++) { - accum = (workT2[i - 1] + accum) * imc_weights1[i - 1]; + accum = (workT2[i - 1] + accum) * q->weights1[i - 1]; flcoeffs5[i] += accum; } @@ -224,7 +240,7 @@ static void imc_calculate_coeffs(IMCContext *q, float *flcoeffs1, workT2[i] = 0.0; for (i = 0; i < BANDS; i++) { - for (cnt2 = i - 1; cnt2 > cyclTab2[i]; cnt2--) + for (cnt2 = i - 1; cnt2 > q->cyclTab2[i]; cnt2--) flcoeffs5[cnt2] += workT3[i]; workT2[cnt2+1] += workT3[i]; } @@ -232,7 +248,7 @@ static void imc_calculate_coeffs(IMCContext *q, float *flcoeffs1, accum = 0.0; for (i = BANDS-2; i >= 0; i--) { - accum = (workT2[i+1] + accum) * imc_weights2[i]; + accum = (workT2[i+1] + accum) * q->weights2[i]; flcoeffs5[i] += accum; // there is missing code here, but it seems to never be triggered } @@ -701,16 +717,17 @@ static int imc_decode_block(AVCodecContext *avctx, IMCContext *q, int ch) /* Check the frame header */ imc_hdr = get_bits(&q->gb, 9); - if (imc_hdr != IMC_FRAME_ID) { - av_log(avctx, AV_LOG_ERROR, "imc frame header check failed!\n"); - av_log(avctx, AV_LOG_ERROR, "got %x instead of 0x21.\n", imc_hdr); + if (imc_hdr & 0x18) { + av_log(avctx, AV_LOG_ERROR, "frame header check failed!\n"); + av_log(avctx, AV_LOG_ERROR, "got %X.\n", imc_hdr); return AVERROR_INVALIDDATA; } stream_format_code = get_bits(&q->gb, 3); if (stream_format_code & 1) { - av_log(avctx, AV_LOG_ERROR, "Stream code format %X is not supported\n", stream_format_code); - return AVERROR_INVALIDDATA; + av_log_ask_for_sample(avctx, "Stream format %X is not supported\n", + stream_format_code); + return AVERROR_PATCHWELCOME; } // av_log(avctx, AV_LOG_DEBUG, "stream_format_code = %d\n", stream_format_code); @@ -773,6 +790,11 @@ static int imc_decode_block(AVCodecContext *avctx, IMCContext *q, int ch) } } } + if (avctx->codec_id == CODEC_ID_IAC) { + bitscount += !!chctx->bandWidthT[BANDS - 1]; + if (!(stream_format_code & 0x2)) + bitscount += 16; + } if ((ret = bit_allocation(q, chctx, stream_format_code, 512 - bitscount - get_bits_count(&q->gb), @@ -860,8 +882,8 @@ static int imc_decode_frame(AVCodecContext *avctx, void *data, LOCAL_ALIGNED_16(uint16_t, buf16, [IMC_BLOCK_SIZE / 2]); - if (buf_size < IMC_BLOCK_SIZE) { - av_log(avctx, AV_LOG_ERROR, "imc frame too small!\n"); + if (buf_size < IMC_BLOCK_SIZE * avctx->channels) { + av_log(avctx, AV_LOG_ERROR, "frame too small!\n"); return AVERROR_INVALIDDATA; } @@ -885,6 +907,18 @@ static int imc_decode_frame(AVCodecContext *avctx, void *data, return ret; } + if (avctx->channels == 2) { + float *src = (float*)q->frame.data[0], t1, t2; + + for (i = 0; i < COEFFS; i++) { + t1 = src[0]; + t2 = src[1]; + src[0] = t1 + t2; + src[1] = t1 - t2; + src += 2; + } + } + *got_frame_ptr = 1; *(AVFrame *)data = q->frame; @@ -913,3 +947,15 @@ AVCodec ff_imc_decoder = { .capabilities = CODEC_CAP_DR1, .long_name = NULL_IF_CONFIG_SMALL("IMC (Intel Music Coder)"), }; + +AVCodec ff_iac_decoder = { + .name = "iac", + .type = AVMEDIA_TYPE_AUDIO, + .id = CODEC_ID_IAC, + .priv_data_size = sizeof(IMCContext), + .init = imc_decode_init, + .close = imc_decode_close, + .decode = imc_decode_frame, + .capabilities = CODEC_CAP_DR1, + .long_name = NULL_IF_CONFIG_SMALL("IAC (Indeo Audio Coder)"), +}; 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