diff options
Diffstat (limited to 'drivers/media/test-drivers/vidtv/vidtv_s302m.c')
| -rw-r--r-- | drivers/media/test-drivers/vidtv/vidtv_s302m.c | 524 |
1 files changed, 524 insertions, 0 deletions
diff --git a/drivers/media/test-drivers/vidtv/vidtv_s302m.c b/drivers/media/test-drivers/vidtv/vidtv_s302m.c new file mode 100644 index 000000000..4676083ce --- /dev/null +++ b/drivers/media/test-drivers/vidtv/vidtv_s302m.c @@ -0,0 +1,524 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Vidtv serves as a reference DVB driver and helps validate the existing APIs + * in the media subsystem. It can also aid developers working on userspace + * applications. + * + * This file contains the code for an AES3 (also known as AES/EBU) encoder. + * It is based on EBU Tech 3250 and SMPTE 302M technical documents. + * + * This encoder currently supports 16bit AES3 subframes using 16bit signed + * integers. + * + * Note: AU stands for Access Unit, and AAU stands for Audio Access Unit + * + * Copyright (C) 2020 Daniel W. S. Almeida + */ + +#define pr_fmt(fmt) KBUILD_MODNAME ":%s, %d: " fmt, __func__, __LINE__ + +#include <linux/bug.h> +#include <linux/crc32.h> +#include <linux/fixp-arith.h> +#include <linux/jiffies.h> +#include <linux/kernel.h> +#include <linux/math64.h> +#include <linux/printk.h> +#include <linux/ratelimit.h> +#include <linux/slab.h> +#include <linux/string.h> +#include <linux/types.h> +#include <linux/vmalloc.h> + +#include "vidtv_common.h" +#include "vidtv_encoder.h" +#include "vidtv_s302m.h" + +#define S302M_SAMPLING_RATE_HZ 48000 +#define PES_PRIVATE_STREAM_1 0xbd /* PES: private_stream_1 */ +#define S302M_BLOCK_SZ 192 +#define S302M_SIN_LUT_NUM_ELEM 1024 + +/* these are retrieved empirically from ffmpeg/libavcodec */ +#define FF_S302M_DEFAULT_NUM_FRAMES 1115 +#define FF_S302M_DEFAULT_PTS_INCREMENT 2090 +#define FF_S302M_DEFAULT_PTS_OFFSET 100000 + +/* Used by the tone generator: number of samples for PI */ +#define PI 180 + +static const u8 reverse[256] = { + /* from ffmpeg */ + 0x00, 0x80, 0x40, 0xC0, 0x20, 0xA0, 0x60, 0xE0, 0x10, 0x90, 0x50, 0xD0, + 0x30, 0xB0, 0x70, 0xF0, 0x08, 0x88, 0x48, 0xC8, 0x28, 0xA8, 0x68, 0xE8, + 0x18, 0x98, 0x58, 0xD8, 0x38, 0xB8, 0x78, 0xF8, 0x04, 0x84, 0x44, 0xC4, + 0x24, 0xA4, 0x64, 0xE4, 0x14, 0x94, 0x54, 0xD4, 0x34, 0xB4, 0x74, 0xF4, + 0x0C, 0x8C, 0x4C, 0xCC, 0x2C, 0xAC, 0x6C, 0xEC, 0x1C, 0x9C, 0x5C, 0xDC, + 0x3C, 0xBC, 0x7C, 0xFC, 0x02, 0x82, 0x42, 0xC2, 0x22, 0xA2, 0x62, 0xE2, + 0x12, 0x92, 0x52, 0xD2, 0x32, 0xB2, 0x72, 0xF2, 0x0A, 0x8A, 0x4A, 0xCA, + 0x2A, 0xAA, 0x6A, 0xEA, 0x1A, 0x9A, 0x5A, 0xDA, 0x3A, 0xBA, 0x7A, 0xFA, + 0x06, 0x86, 0x46, 0xC6, 0x26, 0xA6, 0x66, 0xE6, 0x16, 0x96, 0x56, 0xD6, + 0x36, 0xB6, 0x76, 0xF6, 0x0E, 0x8E, 0x4E, 0xCE, 0x2E, 0xAE, 0x6E, 0xEE, + 0x1E, 0x9E, 0x5E, 0xDE, 0x3E, 0xBE, 0x7E, 0xFE, 0x01, 0x81, 0x41, 0xC1, + 0x21, 0xA1, 0x61, 0xE1, 0x11, 0x91, 0x51, 0xD1, 0x31, 0xB1, 0x71, 0xF1, + 0x09, 0x89, 0x49, 0xC9, 0x29, 0xA9, 0x69, 0xE9, 0x19, 0x99, 0x59, 0xD9, + 0x39, 0xB9, 0x79, 0xF9, 0x05, 0x85, 0x45, 0xC5, 0x25, 0xA5, 0x65, 0xE5, + 0x15, 0x95, 0x55, 0xD5, 0x35, 0xB5, 0x75, 0xF5, 0x0D, 0x8D, 0x4D, 0xCD, + 0x2D, 0xAD, 0x6D, 0xED, 0x1D, 0x9D, 0x5D, 0xDD, 0x3D, 0xBD, 0x7D, 0xFD, + 0x03, 0x83, 0x43, 0xC3, 0x23, 0xA3, 0x63, 0xE3, 0x13, 0x93, 0x53, 0xD3, + 0x33, 0xB3, 0x73, 0xF3, 0x0B, 0x8B, 0x4B, 0xCB, 0x2B, 0xAB, 0x6B, 0xEB, + 0x1B, 0x9B, 0x5B, 0xDB, 0x3B, 0xBB, 0x7B, 0xFB, 0x07, 0x87, 0x47, 0xC7, + 0x27, 0xA7, 0x67, 0xE7, 0x17, 0x97, 0x57, 0xD7, 0x37, 0xB7, 0x77, 0xF7, + 0x0F, 0x8F, 0x4F, 0xCF, 0x2F, 0xAF, 0x6F, 0xEF, 0x1F, 0x9F, 0x5F, 0xDF, + 0x3F, 0xBF, 0x7F, 0xFF, +}; + +struct tone_duration { + enum musical_notes note; + int duration; +}; + +#define COMPASS 100 /* beats per minute */ +static const struct tone_duration beethoven_fur_elise[] = { + { NOTE_SILENT, 512}, + { NOTE_E_6, 128}, { NOTE_DS_6, 128}, { NOTE_E_6, 128}, + { NOTE_DS_6, 128}, { NOTE_E_6, 128}, { NOTE_B_5, 128}, + { NOTE_D_6, 128}, { NOTE_C_6, 128}, { NOTE_A_3, 128}, + { NOTE_E_4, 128}, { NOTE_A_4, 128}, { NOTE_C_5, 128}, + { NOTE_E_5, 128}, { NOTE_A_5, 128}, { NOTE_E_3, 128}, + { NOTE_E_4, 128}, { NOTE_GS_4, 128}, { NOTE_E_5, 128}, + { NOTE_GS_5, 128}, { NOTE_B_5, 128}, { NOTE_A_3, 128}, + { NOTE_E_4, 128}, { NOTE_A_4, 128}, { NOTE_E_5, 128}, + { NOTE_E_6, 128}, { NOTE_DS_6, 128}, { NOTE_E_6, 128}, + { NOTE_DS_6, 128}, { NOTE_E_6, 128}, { NOTE_B_5, 128}, + { NOTE_D_6, 128}, { NOTE_C_6, 128}, { NOTE_A_3, 128}, + { NOTE_E_4, 128}, { NOTE_A_4, 128}, { NOTE_C_5, 128}, + { NOTE_E_5, 128}, { NOTE_A_5, 128}, { NOTE_E_3, 128}, + { NOTE_E_4, 128}, { NOTE_GS_4, 128}, { NOTE_E_5, 128}, + { NOTE_C_6, 128}, { NOTE_B_5, 128}, { NOTE_A_3, 128}, + { NOTE_E_4, 128}, { NOTE_A_4, 128}, { NOTE_SILENT, 128}, + + { NOTE_E_6, 128}, { NOTE_DS_6, 128}, { NOTE_E_6, 128}, + { NOTE_DS_6, 128}, { NOTE_E_6, 128}, { NOTE_B_5, 128}, + { NOTE_D_6, 128}, { NOTE_C_6, 128}, { NOTE_A_3, 128}, + { NOTE_E_4, 128}, { NOTE_A_4, 128}, { NOTE_C_5, 128}, + { NOTE_E_5, 128}, { NOTE_A_5, 128}, { NOTE_E_3, 128}, + { NOTE_E_4, 128}, { NOTE_GS_4, 128}, { NOTE_E_5, 128}, + { NOTE_GS_5, 128}, { NOTE_B_5, 128}, { NOTE_A_3, 128}, + { NOTE_E_4, 128}, { NOTE_A_4, 128}, { NOTE_E_5, 128}, + { NOTE_E_6, 128}, { NOTE_DS_6, 128}, { NOTE_E_6, 128}, + { NOTE_DS_6, 128}, { NOTE_E_6, 128}, { NOTE_B_5, 128}, + { NOTE_D_6, 128}, { NOTE_C_6, 128}, { NOTE_A_3, 128}, + { NOTE_E_4, 128}, { NOTE_A_4, 128}, { NOTE_C_5, 128}, + { NOTE_E_5, 128}, { NOTE_A_5, 128}, { NOTE_E_3, 128}, + { NOTE_E_4, 128}, { NOTE_GS_4, 128}, { NOTE_E_5, 128}, + { NOTE_C_6, 128}, { NOTE_B_5, 128}, { NOTE_A_3, 128}, + { NOTE_E_4, 128}, { NOTE_A_4, 128}, { NOTE_B_4, 128}, + { NOTE_C_5, 128}, { NOTE_D_5, 128}, { NOTE_C_4, 128}, + { NOTE_G_4, 128}, { NOTE_C_5, 128}, { NOTE_G_4, 128}, + { NOTE_F_5, 128}, { NOTE_E_5, 128}, { NOTE_G_3, 128}, + { NOTE_G_4, 128}, { NOTE_B_3, 128}, { NOTE_F_4, 128}, + { NOTE_E_5, 128}, { NOTE_D_5, 128}, { NOTE_A_3, 128}, + { NOTE_E_4, 128}, { NOTE_A_4, 128}, { NOTE_E_4, 128}, + { NOTE_D_5, 128}, { NOTE_C_5, 128}, { NOTE_E_3, 128}, + { NOTE_E_4, 128}, { NOTE_E_5, 128}, { NOTE_E_5, 128}, + { NOTE_E_6, 128}, { NOTE_E_5, 128}, { NOTE_E_6, 128}, + { NOTE_E_5, 128}, { NOTE_E_5, 128}, { NOTE_DS_5, 128}, + { NOTE_E_5, 128}, { NOTE_DS_6, 128}, { NOTE_E_6, 128}, + { NOTE_DS_5, 128}, { NOTE_E_5, 128}, { NOTE_DS_6, 128}, + { NOTE_E_6, 128}, { NOTE_DS_6, 128}, { NOTE_E_6, 128}, + { NOTE_DS_6, 128}, { NOTE_E_6, 128}, { NOTE_B_5, 128}, + { NOTE_D_6, 128}, { NOTE_C_6, 128}, { NOTE_A_3, 128}, + { NOTE_E_4, 128}, { NOTE_A_4, 128}, { NOTE_C_5, 128}, + { NOTE_E_5, 128}, { NOTE_A_5, 128}, { NOTE_E_3, 128}, + { NOTE_E_4, 128}, { NOTE_GS_4, 128}, { NOTE_E_5, 128}, + { NOTE_GS_5, 128}, { NOTE_B_5, 128}, { NOTE_A_3, 128}, + { NOTE_E_4, 128}, { NOTE_A_4, 128}, { NOTE_E_5, 128}, + { NOTE_E_6, 128}, { NOTE_DS_6, 128}, { NOTE_E_6, 128}, + { NOTE_DS_6, 128}, { NOTE_E_6, 128}, { NOTE_B_5, 128}, + { NOTE_D_6, 128}, { NOTE_C_6, 128}, { NOTE_A_3, 128}, + { NOTE_E_4, 128}, { NOTE_A_4, 128}, { NOTE_C_5, 128}, + { NOTE_E_5, 128}, { NOTE_A_5, 128}, { NOTE_E_3, 128}, + { NOTE_E_4, 128}, { NOTE_GS_4, 128}, { NOTE_E_5, 128}, + { NOTE_C_6, 128}, { NOTE_B_5, 128}, { NOTE_A_5, 512}, + { NOTE_SILENT, 256}, +}; + +static struct vidtv_access_unit *vidtv_s302m_access_unit_init(struct vidtv_access_unit *head) +{ + struct vidtv_access_unit *au; + + au = kzalloc(sizeof(*au), GFP_KERNEL); + if (!au) + return NULL; + + if (head) { + while (head->next) + head = head->next; + + head->next = au; + } + + return au; +} + +static void vidtv_s302m_access_unit_destroy(struct vidtv_encoder *e) +{ + struct vidtv_access_unit *head = e->access_units; + struct vidtv_access_unit *tmp = NULL; + + while (head) { + tmp = head; + head = head->next; + kfree(tmp); + } + + e->access_units = NULL; +} + +static void vidtv_s302m_alloc_au(struct vidtv_encoder *e) +{ + struct vidtv_access_unit *sync_au = NULL; + struct vidtv_access_unit *temp = NULL; + + if (e->sync && e->sync->is_video_encoder) { + sync_au = e->sync->access_units; + + while (sync_au) { + temp = vidtv_s302m_access_unit_init(e->access_units); + if (!e->access_units) + e->access_units = temp; + + sync_au = sync_au->next; + } + + return; + } + + e->access_units = vidtv_s302m_access_unit_init(NULL); +} + +static void +vidtv_s302m_compute_sample_count_from_video(struct vidtv_encoder *e) +{ + struct vidtv_access_unit *sync_au = e->sync->access_units; + struct vidtv_access_unit *au = e->access_units; + u32 sample_duration_usecs; + u32 vau_duration_usecs; + u32 s; + + vau_duration_usecs = USEC_PER_SEC / e->sync->sampling_rate_hz; + sample_duration_usecs = USEC_PER_SEC / e->sampling_rate_hz; + + while (au && sync_au) { + s = DIV_ROUND_UP(vau_duration_usecs, sample_duration_usecs); + au->num_samples = s; + au = au->next; + sync_au = sync_au->next; + } +} + +static void vidtv_s302m_compute_pts_from_video(struct vidtv_encoder *e) +{ + struct vidtv_access_unit *au = e->access_units; + struct vidtv_access_unit *sync_au = e->sync->access_units; + + /* use the same pts from the video access unit*/ + while (au && sync_au) { + au->pts = sync_au->pts; + au = au->next; + sync_au = sync_au->next; + } +} + +static u16 vidtv_s302m_get_sample(struct vidtv_encoder *e) +{ + u16 sample; + int pos; + struct vidtv_s302m_ctx *ctx = e->ctx; + + if (!e->src_buf) { + /* + * Simple tone generator: play the tones at the + * beethoven_fur_elise array. + */ + if (ctx->last_duration <= 0) { + if (e->src_buf_offset >= ARRAY_SIZE(beethoven_fur_elise)) + e->src_buf_offset = 0; + + ctx->last_tone = beethoven_fur_elise[e->src_buf_offset].note; + ctx->last_duration = beethoven_fur_elise[e->src_buf_offset].duration * + S302M_SAMPLING_RATE_HZ / COMPASS / 5; + e->src_buf_offset++; + ctx->note_offset = 0; + } else { + ctx->last_duration--; + } + + /* Handle pause notes */ + if (!ctx->last_tone) + return 0x8000; + + pos = (2 * PI * ctx->note_offset * ctx->last_tone) / S302M_SAMPLING_RATE_HZ; + ctx->note_offset++; + + return (fixp_sin32(pos % (2 * PI)) >> 16) + 0x8000; + } + + /* bug somewhere */ + if (e->src_buf_offset > e->src_buf_sz) { + pr_err_ratelimited("overflow detected: %d > %d, wrapping.\n", + e->src_buf_offset, + e->src_buf_sz); + + e->src_buf_offset = 0; + } + + if (e->src_buf_offset >= e->src_buf_sz) { + /* let the source know we are out of data */ + if (e->last_sample_cb) + e->last_sample_cb(e->sample_count); + + e->src_buf_offset = 0; + } + + sample = *(u16 *)(e->src_buf + e->src_buf_offset); + + return sample; +} + +static u32 vidtv_s302m_write_frame(struct vidtv_encoder *e, + u16 sample) +{ + struct vidtv_s302m_ctx *ctx = e->ctx; + struct vidtv_s302m_frame_16 f = {}; + u32 nbytes = 0; + + /* from ffmpeg: see s302enc.c */ + + u8 vucf = ctx->frame_index == 0 ? 0x10 : 0; + + f.data[0] = sample & 0xFF; + f.data[1] = (sample & 0xFF00) >> 8; + f.data[2] = ((sample & 0x0F) << 4) | vucf; + f.data[3] = (sample & 0x0FF0) >> 4; + f.data[4] = (sample & 0xF000) >> 12; + + f.data[0] = reverse[f.data[0]]; + f.data[1] = reverse[f.data[1]]; + f.data[2] = reverse[f.data[2]]; + f.data[3] = reverse[f.data[3]]; + f.data[4] = reverse[f.data[4]]; + + nbytes += vidtv_memcpy(e->encoder_buf, + e->encoder_buf_offset, + VIDTV_S302M_BUF_SZ, + &f, + sizeof(f)); + + e->encoder_buf_offset += nbytes; + + ctx->frame_index++; + if (ctx->frame_index >= S302M_BLOCK_SZ) + ctx->frame_index = 0; + + return nbytes; +} + +static u32 vidtv_s302m_write_h(struct vidtv_encoder *e, u32 p_sz) +{ + struct vidtv_smpte_s302m_es h = {}; + u32 nbytes = 0; + + /* 2 channels, ident: 0, 16 bits per sample */ + h.bitfield = cpu_to_be32((p_sz << 16)); + + nbytes += vidtv_memcpy(e->encoder_buf, + e->encoder_buf_offset, + e->encoder_buf_sz, + &h, + sizeof(h)); + + e->encoder_buf_offset += nbytes; + return nbytes; +} + +static void vidtv_s302m_write_frames(struct vidtv_encoder *e) +{ + struct vidtv_access_unit *au = e->access_units; + struct vidtv_s302m_ctx *ctx = e->ctx; + u32 nbytes_per_unit = 0; + u32 nbytes = 0; + u32 au_sz = 0; + u16 sample; + u32 j; + + while (au) { + au_sz = au->num_samples * + sizeof(struct vidtv_s302m_frame_16); + + nbytes_per_unit = vidtv_s302m_write_h(e, au_sz); + + for (j = 0; j < au->num_samples; ++j) { + sample = vidtv_s302m_get_sample(e); + nbytes_per_unit += vidtv_s302m_write_frame(e, sample); + + if (e->src_buf) + e->src_buf_offset += sizeof(u16); + + e->sample_count++; + } + + au->nbytes = nbytes_per_unit; + + if (au_sz + sizeof(struct vidtv_smpte_s302m_es) != nbytes_per_unit) { + pr_warn_ratelimited("write size was %u, expected %zu\n", + nbytes_per_unit, + au_sz + sizeof(struct vidtv_smpte_s302m_es)); + } + + nbytes += nbytes_per_unit; + au->offset = nbytes - nbytes_per_unit; + + nbytes_per_unit = 0; + ctx->au_count++; + + au = au->next; + } +} + +static void *vidtv_s302m_encode(struct vidtv_encoder *e) +{ + struct vidtv_s302m_ctx *ctx = e->ctx; + + /* + * According to SMPTE 302M, an audio access unit is specified as those + * AES3 words that are associated with a corresponding video frame. + * Therefore, there is one audio access unit for every video access unit + * in the corresponding video encoder ('sync'), using the same values + * for PTS as used by the video encoder. + * + * Assuming that it is also possible to send audio without any + * associated video, as in a radio-like service, a single audio access unit + * is created with values for 'num_samples' and 'pts' taken empirically from + * ffmpeg + */ + + vidtv_s302m_access_unit_destroy(e); + vidtv_s302m_alloc_au(e); + + if (e->sync && e->sync->is_video_encoder) { + vidtv_s302m_compute_sample_count_from_video(e); + vidtv_s302m_compute_pts_from_video(e); + } else { + e->access_units->num_samples = FF_S302M_DEFAULT_NUM_FRAMES; + e->access_units->pts = (ctx->au_count * FF_S302M_DEFAULT_PTS_INCREMENT) + + FF_S302M_DEFAULT_PTS_OFFSET; + } + + vidtv_s302m_write_frames(e); + + return e->encoder_buf; +} + +static u32 vidtv_s302m_clear(struct vidtv_encoder *e) +{ + struct vidtv_access_unit *au = e->access_units; + u32 count = 0; + + while (au) { + count++; + au = au->next; + } + + vidtv_s302m_access_unit_destroy(e); + memset(e->encoder_buf, 0, VIDTV_S302M_BUF_SZ); + e->encoder_buf_offset = 0; + + return count; +} + +struct vidtv_encoder +*vidtv_s302m_encoder_init(struct vidtv_s302m_encoder_init_args args) +{ + u32 priv_sz = sizeof(struct vidtv_s302m_ctx); + struct vidtv_s302m_ctx *ctx; + struct vidtv_encoder *e; + + e = kzalloc(sizeof(*e), GFP_KERNEL); + if (!e) + return NULL; + + e->id = S302M; + + if (args.name) + e->name = kstrdup(args.name, GFP_KERNEL); + + e->encoder_buf = vzalloc(VIDTV_S302M_BUF_SZ); + if (!e->encoder_buf) + goto out_kfree_e; + + e->encoder_buf_sz = VIDTV_S302M_BUF_SZ; + e->encoder_buf_offset = 0; + + e->sample_count = 0; + + e->src_buf = (args.src_buf) ? args.src_buf : NULL; + e->src_buf_sz = (args.src_buf) ? args.src_buf_sz : 0; + e->src_buf_offset = 0; + + e->is_video_encoder = false; + + ctx = kzalloc(priv_sz, GFP_KERNEL); + if (!ctx) + goto out_kfree_buf; + + e->ctx = ctx; + ctx->last_duration = 0; + + e->encode = vidtv_s302m_encode; + e->clear = vidtv_s302m_clear; + + e->es_pid = cpu_to_be16(args.es_pid); + e->stream_id = cpu_to_be16(PES_PRIVATE_STREAM_1); + + e->sync = args.sync; + e->sampling_rate_hz = S302M_SAMPLING_RATE_HZ; + + e->last_sample_cb = args.last_sample_cb; + + e->destroy = vidtv_s302m_encoder_destroy; + + if (args.head) { + while (args.head->next) + args.head = args.head->next; + + args.head->next = e; + } + + e->next = NULL; + + return e; + +out_kfree_buf: + kfree(e->encoder_buf); + +out_kfree_e: + kfree(e->name); + kfree(e); + return NULL; +} + +void vidtv_s302m_encoder_destroy(struct vidtv_encoder *e) +{ + if (e->id != S302M) { + pr_err_ratelimited("Encoder type mismatch, skipping.\n"); + return; + } + + vidtv_s302m_access_unit_destroy(e); + kfree(e->name); + vfree(e->encoder_buf); + kfree(e->ctx); + kfree(e); +} |