Add support for external OpenCORE libraries for AMR-NB/WB support.

Originally committed as revision 19117 to svn://svn.ffmpeg.org/ffmpeg/trunk

1 files changed, 325 insertions, 0 deletions

diff --git a/libavcodec/libopencore-amr.c b/libavcodec/libopencore-amr.c
new file mode 100644
index 0000000000..1544db7bed
--- /dev/null
+++ b/libavcodec/libopencore-amr.c
@@ -0,0 +1,325 @@
+/*
+ * AMR Audio decoder stub
+ * Copyright (c) 2003 the ffmpeg project
+ *
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * FFmpeg is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include "avcodec.h"
+
+static void amr_decode_fix_avctx(AVCodecContext *avctx)
+{
+    const int is_amr_wb = 1 + (avctx->codec_id == CODEC_ID_AMR_WB);
+
+    if (!avctx->sample_rate)
+        avctx->sample_rate = 8000 * is_amr_wb;
+
+    if (!avctx->channels)
+        avctx->channels = 1;
+
+    avctx->frame_size = 160 * is_amr_wb;
+    avctx->sample_fmt = SAMPLE_FMT_S16;
+}
+
+#if CONFIG_LIBOPENCORE_AMRNB
+
+#include <opencore-amrnb/interf_dec.h>
+#include <opencore-amrnb/interf_enc.h>
+
+static const char nb_bitrate_unsupported[] =
+    "bitrate not supported: use one of 4.75k, 5.15k, 5.9k, 6.7k, 7.4k, 7.95k, 10.2k or 12.2k\n";
+
+/* Common code for fixed and float version*/
+typedef struct AMR_bitrates {
+    int       rate;
+    enum Mode mode;
+} AMR_bitrates;
+
+/* Match desired bitrate */
+static int getBitrateMode(int bitrate)
+{
+    /* make the correspondance between bitrate and mode */
+    AMR_bitrates rates[] = { { 4750, MR475},
+                             { 5150, MR515},
+                             { 5900, MR59},
+                             { 6700, MR67},
+                             { 7400, MR74},
+                             { 7950, MR795},
+                             {10200, MR102},
+                             {12200, MR122}, };
+    int i;
+
+    for (i = 0; i < 8; i++)
+        if (rates[i].rate == bitrate)
+            return rates[i].mode;
+    /* no bitrate matching, return an error */
+    return -1;
+}
+
+typedef struct AMRContext {
+    int   frameCount;
+    void *decState;
+    int  *enstate;
+    int   enc_bitrate;
+} AMRContext;
+
+static av_cold int amr_nb_decode_init(AVCodecContext *avctx)
+{
+    AMRContext *s = avctx->priv_data;
+
+    s->frameCount = 0;
+    s->decState   = Decoder_Interface_init();
+    if (!s->decState) {
+        av_log(avctx, AV_LOG_ERROR, "Decoder_Interface_init error\r\n");
+        return -1;
+    }
+
+    amr_decode_fix_avctx(avctx);
+
+    if (avctx->channels > 1) {
+        av_log(avctx, AV_LOG_ERROR, "amr_nb: multichannel decoding not supported\n");
+        return -1;
+    }
+
+    return 0;
+}
+
+static av_cold int amr_nb_decode_close(AVCodecContext *avctx)
+{
+    AMRContext *s = avctx->priv_data;
+
+    Decoder_Interface_exit(s->decState);
+    return 0;
+}
+
+static int amr_nb_decode_frame(AVCodecContext *avctx, void *data,
+                               int *data_size, AVPacket *avpkt)
+{
+    const uint8_t *buf = avpkt->data;
+    int buf_size       = avpkt->size;
+    AMRContext *s = avctx->priv_data;
+    const uint8_t *amrData = buf;
+    static const uint8_t block_size[16] = { 12, 13, 15, 17, 19, 20, 26, 31, 5, 0, 0, 0, 0, 0, 0, 0 };
+    enum Mode dec_mode;
+    int packet_size;
+
+    /* av_log(NULL, AV_LOG_DEBUG, "amr_decode_frame buf=%p buf_size=%d frameCount=%d!!\n",
+              buf, buf_size, s->frameCount); */
+
+    dec_mode = (buf[0] >> 3) & 0x000F;
+    packet_size = block_size[dec_mode] + 1;
+
+    if (packet_size > buf_size) {
+        av_log(avctx, AV_LOG_ERROR, "amr frame too short (%u, should be %u)\n",
+               buf_size, packet_size);
+        return -1;
+    }
+
+    s->frameCount++;
+    /* av_log(NULL, AV_LOG_DEBUG, "packet_size=%d amrData= 0x%X %X %X %X\n",
+              packet_size, amrData[0], amrData[1], amrData[2], amrData[3]); */
+    /* call decoder */
+    Decoder_Interface_Decode(s->decState, amrData, data, 0);
+    *data_size = 160 * 2;
+
+    return packet_size;
+}
+
+AVCodec libopencore_amrnb_decoder = {
+    "libopencore_amrnb",
+    CODEC_TYPE_AUDIO,
+    CODEC_ID_AMR_NB,
+    sizeof(AMRContext),
+    amr_nb_decode_init,
+    NULL,
+    amr_nb_decode_close,
+    amr_nb_decode_frame,
+    .long_name = NULL_IF_CONFIG_SMALL("OpenCORE Adaptive Multi-Rate (AMR) Narrow-Band"),
+};
+
+static av_cold int amr_nb_encode_init(AVCodecContext *avctx)
+{
+    AMRContext *s = avctx->priv_data;
+
+    s->frameCount = 0;
+
+    if (avctx->sample_rate != 8000) {
+        av_log(avctx, AV_LOG_ERROR, "Only 8000Hz sample rate supported\n");
+        return -1;
+    }
+
+    if (avctx->channels != 1) {
+        av_log(avctx, AV_LOG_ERROR, "Only mono supported\n");
+        return -1;
+    }
+
+    avctx->frame_size  = 160;
+    avctx->coded_frame = avcodec_alloc_frame();
+
+    s->enstate=Encoder_Interface_init(0);
+    if (!s->enstate) {
+        av_log(avctx, AV_LOG_ERROR, "Encoder_Interface_init error\n");
+        return -1;
+    }
+
+    if ((s->enc_bitrate = getBitrateMode(avctx->bit_rate)) < 0) {
+        av_log(avctx, AV_LOG_ERROR, nb_bitrate_unsupported);
+        return -1;
+    }
+
+    return 0;
+}
+
+static av_cold int amr_nb_encode_close(AVCodecContext *avctx)
+{
+    AMRContext *s = avctx->priv_data;
+
+    Encoder_Interface_exit(s->enstate);
+    av_freep(&avctx->coded_frame);
+    return 0;
+}
+
+static int amr_nb_encode_frame(AVCodecContext *avctx,
+                               unsigned char *frame/*out*/,
+                               int buf_size, void *data/*in*/)
+{
+    AMRContext *s = avctx->priv_data;
+    int written;
+
+    if ((s->enc_bitrate = getBitrateMode(avctx->bit_rate)) < 0) {
+        av_log(avctx, AV_LOG_ERROR, nb_bitrate_unsupported);
+        return -1;
+    }
+
+    written = Encoder_Interface_Encode(s->enstate, s->enc_bitrate, data,
+                                       frame, 0);
+    /* av_log(NULL, AV_LOG_DEBUG, "amr_nb_encode_frame encoded %u bytes, bitrate %u, first byte was %#02x\n",
+              written, s->enc_bitrate, frame[0] ); */
+
+    return written;
+}
+
+AVCodec libopencore_amrnb_encoder = {
+    "libopencore_amrnb",
+    CODEC_TYPE_AUDIO,
+    CODEC_ID_AMR_NB,
+    sizeof(AMRContext),
+    amr_nb_encode_init,
+    amr_nb_encode_frame,
+    amr_nb_encode_close,
+    NULL,
+    .sample_fmts = (enum SampleFormat[]){SAMPLE_FMT_S16,SAMPLE_FMT_NONE},
+    .long_name = NULL_IF_CONFIG_SMALL("OpenCORE Adaptive Multi-Rate (AMR) Narrow-Band"),
+};
+
+#endif
+
+/* -----------AMR wideband ------------*/
+#if CONFIG_LIBOPENCORE_AMRWB
+
+#ifdef _TYPEDEF_H
+//To avoid duplicate typedefs from typedef in amr-nb
+#define typedef_h
+#endif
+
+#include <opencore-amrwb/dec_if.h>
+#include <opencore-amrwb/if_rom.h>
+
+static const char wb_bitrate_unsupported[] =
+    "bitrate not supported: use one of 6.6k, 8.85k, 12.65k, 14.25k, 15.85k, 18.25k, 19.85k, 23.05k, or 23.85k\n";
+
+/* Common code for fixed and float version*/
+typedef struct AMRWB_bitrates {
+    int rate;
+    int mode;
+} AMRWB_bitrates;
+
+typedef struct AMRWBContext {
+    int    frameCount;
+    void  *state;
+    int    mode;
+    Word16 allow_dtx;
+} AMRWBContext;
+
+static av_cold int amr_wb_decode_init(AVCodecContext *avctx)
+{
+    AMRWBContext *s = avctx->priv_data;
+
+    s->frameCount = 0;
+    s->state      = D_IF_init();
+
+    amr_decode_fix_avctx(avctx);
+
+    if (avctx->channels > 1) {
+        av_log(avctx, AV_LOG_ERROR, "amr_wb: multichannel decoding not supported\n");
+        return -1;
+    }
+
+    return 0;
+}
+
+static int amr_wb_decode_frame(AVCodecContext *avctx, void *data,
+                               int *data_size, AVPacket *avpkt)
+{
+    const uint8_t *buf = avpkt->data;
+    int buf_size       = avpkt->size;
+    AMRWBContext *s = avctx->priv_data;
+    const uint8_t *amrData = buf;
+    int mode;
+    int packet_size;
+    static const uint8_t block_size[16] = {18, 24, 33, 37, 41, 47, 51, 59, 61, 6, 6, 0, 0, 0, 1, 1};
+
+    if (!buf_size)
+        /* nothing to do */
+        return 0;
+
+    mode = (amrData[0] >> 3) & 0x000F;
+    packet_size = block_size[mode];
+
+    if (packet_size > buf_size) {
+        av_log(avctx, AV_LOG_ERROR, "amr frame too short (%u, should be %u)\n",
+               buf_size, packet_size + 1);
+        return -1;
+    }
+
+    s->frameCount++;
+    D_IF_decode(s->state, amrData, data, _good_frame);
+    *data_size = 320 * 2;
+    return packet_size;
+}
+
+static int amr_wb_decode_close(AVCodecContext *avctx)
+{
+    AMRWBContext *s = avctx->priv_data;
+
+    D_IF_exit(s->state);
+    return 0;
+}
+
+AVCodec libopencore_amrwb_decoder = {
+    "libopencore_amrwb",
+    CODEC_TYPE_AUDIO,
+    CODEC_ID_AMR_WB,
+    sizeof(AMRWBContext),
+    amr_wb_decode_init,
+    NULL,
+    amr_wb_decode_close,
+    amr_wb_decode_frame,
+    .long_name = NULL_IF_CONFIG_SMALL("OpenCORE Adaptive Multi-Rate (AMR) Wide-Band"),
+};
+
+#endif /* CONFIG_LIBOPENCORE_AMRWB */